Manuale d’uso / di manutenzione del prodotto 2955 del fabbricante Cisco Systems
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Americas Headquarters Cisco Systems, In c. 170 West Tasman Drive San Jose, CA 951 34-1706 USA http://www.ci sco.com Tel: 408 526-4000 800 553-NETS (638 7) Fax: 408 527-0883 Catal yst 2950 and Catal yst 2955 S witc h S of tw are Conf iguration Guide Cisco IOS Release 12.
THE SPECIFICATION S AND INFORMATION RE GARDING THE PRODU CTS IN THIS MANU AL ARE SUBJECT T O CHANGE WITHOUT N OTICE. ALL STATEMENTS , INFORMATION , AND RECOMMEN DATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESEN TED WITHOUT WARRANTY OF ANY KIND, EX PRESS OR IMPLIED.
iii Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 CONTENTS Preface xxvii Audience xxvii Purpose xxvii Conventi ons xxviii Related Publica tions xxix Obtaining Docu.
Contents iv Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 CHAPTER 2 Using the Command-Line Interface 2-1 Cisco IOS Command Modes 2-1 Getting Help 2-3 Abbreviating Co.
Contents v Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Configuring Alarm Profiles 3-9 Creating o r Modifying an Alarm Profi le 3-9 Attaching an Alarm Profile to .
Contents vi Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Event Service 5-3 NameSpace Mapper 5-3 What You Should Know About the CNS IDs and Dev ice Hostnames 5-3 Con.
Contents vii Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 TACACS+ and RADIUS 6-13 LRE Profiles 6-13 Catalyst 1900 and Catalyst 2820 CLI Considerations 6-14 Using .
Contents viii Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Configuring MAC Address Notification Traps 7-21 Adding and Removing Static Address Entries 7-23 Configuring Unicast MAC Address Filtering 7-24 .
Contents ix Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Configuring RADIUS 8-19 Default RADIUS Configuration 8-20 Identifying the RADIUS Server Host 8-20 Configu.
Contents x Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Configuring IEEE 802.1x Authentication 9-12 Default IEEE 802.1x Authen tication Configuration 9-12 IEEE 802.1x Authentication Con figuration Guidelines 9-13 IEEE 802.
Contents xi Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Configuring Media Types for Gigabit Ethernet Interface s on LRE Switches 10-13 Configuring IEEE 802.
Contents xii Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Using Rate Selection to Au tomatically Assign P rofiles 12-14 Precedence 12-15 Profile Locking 12-15 Link .
Contents xiii Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Configuring Spanning-Tree Feature s 13-10 Default Spanning-Tree Configuration 13-11 Spanning-Tree Confi.
Contents xiv Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Configuring the Root Switch 14-14 Configuring a Secondary Root Switch 14-15 Configuring the Port Priority .
Contents xv Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Enabling Root Guar d 15-20 Enabling Loop Guard 15-20 Displaying the Spanning-Tree Status 15 -21 CHAPTER 1.
Contents xvi Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Configuring VMPS 16-23 Understanding VMP S 16-23 Dynamic Port VLAN Membership 16-24 VMPS Database Config u.
Contents xvii Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Enabling VTP Pruning 17-14 Adding a VTP Client Switch to a VTP Domain 17-14 Monitoring VTP 17-15 CHAPTE.
Contents xviii Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Configuring IGMP Snooping 20-6 Default IGMP Snooping Configuration 20-7 Enabling or Disabling IGMP Snoop.
Contents xix Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Configuring Port Blocking 21 -5 Blocking Flooded Traffic on an Interface 21-5 Resuming Normal Fo rwardin.
Contents xx Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 CHAPTER 24 Configuring SPAN and RSPAN 24-1 Understanding SPAN and RSPAN 24-1 SPAN and RSPAN Concepts and Te.
Contents xxi Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Disabling and Enabling Message Log ging 26-3 Setting the Mes sage Display Destination De vice 26-4 Synch.
Contents xxii Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Creating Standard and Exte nded IP ACLs 28-7 ACL Numbers 28-7 Creating a Numbered Standard ACL 28-8 Creat.
Contents xxiii Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Enabling Auto-QoS for VoIP 29-13 Displaying Auto-QoS Information 29-14 Auto-QoS Configuration Example .
Contents xxiv Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Configuring Layer 2 EtherChannels 30-9 Configuring EtherChannel Lo ad Balancing 30-11 Configuring the PAg.
Contents xxv Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 APPENDIX A Supported MIBs A-1 MIB List A-1 Using FTP to Access the MIB Files A-3 APPENDIX B Working with.
Contents xxvi Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 tar File Format of Images on a Server or .com B-19 Copying Image Files By Using TFTP B-20 Preparing to Do.
xxvii Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Preface Audience This guide is for the netw orking professi onal managi ng the Catalyst 29 50 and 2955 switches, hereafte r referred to as the switches .
xxviii Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Preface • CLI command information—This gu ide provides an o vervie w for using the CLI.
xxix Catalyst 2950 and Catalyst 2955 Swit ch Software Con figurat ion Guide OL-10101-02 Preface Related Publications These documents pro vide complete information about th e switch and are a v ailable from thi s Cisco.com site: http://www .cisco.com/en/US/ products/ps67 38/tsd_pro ducts_support_series_home.
xxx Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Preface Obtaining Documentation and Submitting a Service Request For info rmation on obtaining documentatio n, subm.
CH A P T E R 1-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 1 Overview This chapter p rovides these topics ab out the Catalyst 2950 and Catalyst 2955 switch softw.
1-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Features Certain Cisco Long-Reach Ethern et (LRE) custom er premises equipment (CPE) devices are not supported b y certain Catalyst 2950 LRE switches.
1-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Features – Accomplishing multiple conf iguration tasks from a single windo w without needing to remember command-line interface (CLI) commands to accomplish specif ic tasks.
1-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Features • Port blocking on forw arding unknown u nicast and multicast traf fic (av ailable o.
1-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Features • Default conf iguration storage in flash memory to ensure that the switch can be con.
1-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Features VLAN Support • The switches support 250 po rt-based VLANs for assignin g users to VL.
1-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Features • IEEE 802.1x with wake-on-LAN to allo w dormant PC s to be powered on based on the receipt of a specific Ethernet frame • IEEE 802.1x with restricted VLAN to provide limited services to users who are IEEE 802.
1-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Features Monitoring • Switch LEDs that sho w port and switch status • Switched Port Analy zer (SP AN) and Rem ote SP AN (RSP AN) fo r traf fic mo nitoring on an y port or VLAN Note RSP AN is av ailable only in the EI.
1-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Management Option s • Support for conf iguring the interleav e delay feature • Support for D.
1-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Management Option s • SNMP—SNMP provides a means to monitor and control the switch an d switch cluster members.
1-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Network Co nfiguration Examples Network Configuration Examples This section pro vides network c.
1-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Network Config uration Examples Figure 1-1 sho w s conf iguration e x amples of using t he Cat.
1-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Network Co nfiguration Examples – GigaStack GBIC module for crea ting a 1-Gb ps stack config uration of up to nine su pported switches.
1-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Network Config uration Examples Small to Medium-Sized Network Configuration Figure 1-2 sho w s a conf iguration for a netw ork that has up to 250 users.
1-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Network Co nfiguration Examples Servers are connected to the GBIC module ports on th e switches, allo wing 1-Gbps throug hput to users when needed.
1-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Network Config uration Examples Figur e 1 -3 Collapsed Bac kbone and Switc h Cluster Con figur.
1-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Network Co nfiguration Examples Note All telephones not di rectly connecte d to the hotel room CPE de vice require microfilters with a 300- ohm termination.
1-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Network Config uration Examples Figur e 1 -4 Netw or k Hotel Configur ation Service-Provider Central-Office Configuration Figure 1-5 sho ws the Catalyst 2950ST -24 LRE 997 switches in a service-prov ider central-off ice network en vironment.
1-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Network Co nfiguration Examples Y ou c an use a PO TS splitter to connect the switc h es to the CPE de vices.
1-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Network Config uration Examples Figur e 1 -5 Service Pr ovider Cen tral Of fice Configur ation Large Campus Configuration Figure 1-6 sho ws a configu ration for a netw ork of more than 1000 users.
1-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Network Co nfiguration Examples Figur e 1 -6 Larg e Campus Configuration Multidwelling Network .
1-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Network Config uration Examples All ports on the residential Cata lyst 2950 and 29 55 switches (and Catalyst LRE switches if they are included) are conf igured as 802.
1-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 1 Overview Network Co nfiguration Examples Long-Distance, High-Bandwidth Transport Configuration Note T o use the feature described in this section, you must hav e the EI installed on your switch.
1-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 1 Overvi ew Where to Go Next Where to Go Next Before conf iguring the switch, re view th ese sections for .
CH A P T E R 2-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 2 Using the Command-Line Interface This chapter describes the Cisco IOS command-line interface (CLI) that you can use to configure your Catalyst 2950 and Catalyst 2955.
2-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 2 Using the Comman d-Line Interface Cisco IOS Command Modes Ta b l e 2-1 describes the main command modes, how to acce ss each one, the prompt you see in that mode, and ho w to exit th e mode.
2-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 2 Using th e Co mmand-Line Interface Getting Help Getting Help Y o u can enter a question mark (?) at the system prompt to display a list of commands a vailabl e for each command mo de.
2-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 2 Using the Comman d-Line Interface Abbreviating Command s Abbreviating Commands Y ou have to en ter only enough characters for the swit ch to recognize the co mmand as unique.
2-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 2 Using th e Co mmand-Line Interface Understanding CLI Messages Understanding CLI Messages Ta b l e 2-3 lists some error messages that you mi ght encounter while u sing the CLI to conf igure your switch.
2-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 2 Using the Comman d-Line Interface Using Ed iting Features Recalling Commands T o recall commands from the.
2-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 2 Using th e Co mmand-Line Interface Using Editing Feature s T o globally disable enhanced editin g mode, e.
2-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 2 Using the Comman d-Line Interface Using Ed iting Features Editing Command Lines that Wrap Y ou can use a wraparound feature for commands that extend b eyond a single line on the screen.
2-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 2 Using th e Co mmand-Line Interface Searching and Filtering Outpu t of show and more Commands Use line wrapping w ith the command history feat ur e to recall and modify pre vious complex comman d entries.
2-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 2 Using the Comman d-Line Interface Accessing the CLI.
CH A P T E R 3-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 3 Configuring Catalyst 2955 Switch Alarms This section descri bes ho w to conf igure the di f ferent alarms for the Cata lyst 2955 switch . Note The alarms described in this chapte r are not av aila ble on the Catalyst 2950 sw itch.
3-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 3 Configuring Catalyst 2955 Switch Alarms Understanding Ca talyst 2955 Switch Alarms Global Status Monitoring Alarms The Catalyst 2955 switch contains facilities for processing alarms related to temperat ure and power supply conditions.
3-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 3 Configur ing Catalyst 2955 Switch Alarms Understanding Catalyst 2955 Switch Alarms Port Status Monitoring.
3-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 3 Configuring Catalyst 2955 Switch Alarms Configuring Catalyst 2955 Switch Alarms • SNMP T raps SNMP is an applicat ion-layer protocol that pr ovides a message format for communication between managers and agents.
3-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 3 Configur ing Catalyst 2955 Switch Alarms Configuring Catalyst 2955 Switch Alarms Configuring the Power Supply Alarm This section describes ho w to conf igure the po wer supply alarm on your switch.
3-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 3 Configuring Catalyst 2955 Switch Alarms Configuring Catalyst 2955 Switch Alarms T o disable sending the a.
3-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 3 Configur ing Catalyst 2955 Switch Alarms Configuring Catalyst 2955 Switch Alarms Associating the Temperatur e Alarms to a Relay By default, the pr imary temperature alarm is a ssociated to the major rela y .
3-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 3 Configuring Catalyst 2955 Switch Alarms Configuring Catalyst 2955 Switch Alarms Setting the FCS Error Threshold The switch generates an FCS bit error rate alarm w h en the actual FCS bit erro r rate is close to the configured FCS bit error rate.
3-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 3 Configur ing Catalyst 2955 Switch Alarms Configuring Catalyst 2955 Switch Alarms Use the no alarm facility fcs-hyst eresis command to set the FCS error hysteresis threshold t o its default va lu e .
3-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 3 Configuring Catalyst 2955 Switch Alarms Configuring Catalyst 2955 Switch Alarms This example creates or .
3-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 3 Configur ing Catalyst 2955 Switch Alarms Displaying Catalyst 2955 Switch Alarms Status This example detaches an alarm profile named fastE from a port.
3-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 3 Configuring Catalyst 2955 Switch Alarms Displaying Catalyst 2955 Switch Alarms Status.
CH A P T E R 4-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 4 Assigning the Switch IP Address and Default Gateway This chapter describes how to creat e the initia.
4-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information The boot loader provides access to the flash fi le syst em before the operating system is lo aded.
4-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information CLI-based setup program also allo ws you to configur e your switch as a comman d or member switch of a cluster or as a standalone switch.
4-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information Note The DHCP server feature i s only av ailable on Catalyst 2955 switches.
4-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information In a DHCPREQUEST broadcast message, the client returns a for mal request for the of fered configuration information to the DHCP serv er .
4-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information If you want the switch .
4-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information Configuring the DNS The DHCP server uses the DNS server to resolve the TFTP serv e r name to an IP address.
4-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information Obtaining Configuration.
4-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information Example Configuration Figure 4-3 shows a sample network for retrieving IP info rmation by using DHCP-based autoconfiguration .
4-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information switchb-confg switchc-confg switchd-confg prompt> cat network-confg ip host switch1 10.
4-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Assigning Switch Information Note The configur atio.
4-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Checking and Saving the Ru nning Configuration Note Y ou should only conf igure and ena ble the Layer 3 inte rface.
4-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Modifying the Startup Configuration T o store the c.
4-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Modifying the Star tup Configuration Specifying the Filename to Read and Write the System Configuration By default, the Cisco IO S software uses the f ile config .
4-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Modifying the Startup Configuration T o disable manual booting, use the no boot manual global conf iguration command.
4-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Modifying the Star tup Configuration Controlling Environment Variables Y o u enter the boot loader mo de only through a switch console connection c onf igured for 9600 bp s.
4-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Scheduling a Re load of the Software Image Ta b l e 4-5 describes the function of th e most common en vironment v a riables.
4-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Scheduling a Reload of the Software Image Note A scheduled reload must take pl ace within approxima tely 24 days.
4-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Scheduling a Re load of the Software Image Displayi.
4-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 4 Assigning the Sw itch IP Address and Default Gateway Scheduling a Reload of the Software Image.
CH A P T E R 5-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 5 Configuring Cisco IOS CNS Agents This chapter describes ho w to config ure the Cisco IOS CNS agents on the Cat alyst 2950 or Catalyst 295 5 switch.
5-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 5 Configurin g Cisco IOS CNS Agents Understanding Cisc o Configuration Engine Software Figur e 5-1 Configur.
5-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 5 Configuring Cisco IOS CNS Agents Understanding Cisco Co nfiguration Engine Softw are The Configuration Service uses the CNS Event Service to send and recei ve conf iguration change e vents and to send success and fail ure notificatio ns.
5-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 5 Configurin g Cisco IOS CNS Agents Understanding Cisc o Configuration Engine Software W ithin the scope o f a single ins tance of the conf igur ation serv er , no two conf ig ured switches can share the same v alue for Conf igID.
5-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 5 Configuring Cisco IOS CNS Agents Understanding Cisco IOS Age nts Using Hostname, DeviceID, and ConfigID I.
5-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 5 Configurin g Cisco IOS CNS Agents Understanding Cisco IOS Agents Figur e 5-2 Initial Config uration Overview Incremental (Partial) Configuration After the networ k is running, ne w services can be added by using the Cisco IOS agent.
5-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 5 Configuring Cisco IOS CNS Agents Configuring Cisco IOS Agents Configuring Cisco IOS Agents The Cisco IOS .
5-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 5 Configurin g Cisco IOS CNS Agents Configuring Cisco IOS Agents Enabling the CNS Event Agent Note Y ou must enable the CNS e vent ag ent on the switch before you en able the CNS configuration agent.
5-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 5 Configuring Cisco IOS CNS Agents Configuring Cisco IOS Agents Enabling the Cisco IOS CNS Agent After enabling the CNS ev ent agent, start the Cisco IOS CNS agent on the switch.
5-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 5 Configurin g Cisco IOS CNS Agents Configuring Cisco IOS Agents Step 7 cns id inte rface num { dns-re ver.
5-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 5 Configuring Cisco IOS CNS Agents Configuring Cisco IOS Agents T o disable the CNS Cisco IOS age nt, use the no cns conf ig initial { ip-address | hostname } global confi guration command.
5-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 5 Configurin g Cisco IOS CNS Agents Displaying CNS Configuration Displaying CNS Configuration Y ou can use the pri vileged EXEC co mmands in Ta b l e 5-2 to display CNS conf iguration in formation.
CH A P T E R 6-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 6 Clustering Switches This chapter provides the concepts and pr oce dures to create and manage Catalyst 2950 and 2955 switch clusters.
6-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Sw itches Understanding Switch Clusters In a switch cluster , 1 switch must be the cluster command swi tch an d up to 15 other switches can be cluster member sw itches .
6-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Switches Understanding Sw itch Clusters • It has an IP address. • It has Cisco Disco very Protocol (CDP ) version 2 enab led (the default). • It is not a command or cluster member swit ch of another cluster .
6-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Sw itches Planning a Switch Clus ter Note Non-LRE Catalyst 2950 command swit ches running Ci sco IOS Release 12.1(9)EA1 or later can connect to standb y command switches in the management VLAN.
6-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Switches Planning a Switch Clu ster • IP Addresses, page 6-12 • Hostnames, page 6-12 • P.
6-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Sw itches Planning a Switch Clus ter Figur e 6-1 Discovery Through CDP Hops Discovery Through .
6-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Switches Planning a Switch Clu ster Discovery Through Different VLANs If the cluster command switch is a Catalyst 2940, Catalyst 2950, Catal yst 2955, or Catalyst 3550 switch, the cluster can hav e cluster me mber switches in di fferent VLANs.
6-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Sw itches Planning a Switch Clus ter • Switch 9 because automatic d iscovery does not exte n.
6-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Switches Planning a Switch Clu ster Figur e 6-5 Discov ery of Newly Installed Switc hes HSRP a.
6-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Sw itches Planning a Switch Clus ter • Other Considerations for Cl uster Standby G roups, p.
6-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Switches Planning a Switch Clu ster Figur e 6-6 VLAN Connectivity between Standby -Group Memb.
6-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Sw itches Planning a Switch Clus ter IP Addresses Y ou must assign IP information to a cluster command switch.
6-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Switches Planning a Switch Clu ster For password considerations specific to the Catalyst 1900 and Catalyst 2820 switches, refer to the installation and con figur ation guides for tho se switches.
6-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Sw itches Using SNMP to Man age Switch Clusters The T elnet session a ccesses the member-switch CLI at the same privile g e le vel as on the command switch.
6-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Switches Using SNMP to Mana ge Switch Clusters If a member switch has its o wn IP ad dress and community strin gs, they can be used in addition to the access provided by the command switch.
6-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 6 Clustering Sw itches Using SNMP to Man age Switch Clusters.
CH A P T E R 7-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 7 Administering the Switch This chapter describes ho w to perform one-t ime operations t o administer your Cat alyst 2950 or Catalyst 2955.
7-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the System Time and Date The system clock can provide time to these se.
7-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the System Time and Date Figur e 7 -1 T ypical NTP Netw ork Con figurat.
7-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the System Time and Date • Config uring NTP Broadcast Ser vice, page.
7-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the System Time and Date T o disable NTP authentica tion, use the no ntp authenticate global conf iguration co mmand.
7-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the System Time and Date Beginni ng in pri vileged EXEC mode, follo w .
7-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the System Time and Date The switch can send or receiv e NTP broadcast packets on an interface-by -interfa ce basis if there is an NTP broadcast server , such as a router, broadcasting time i nformation on the netw ork.
7-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the System Time and Date T o disable an interface from rece i v ing NTP broadcast packets, use the no ntp br oadcast client interface confi guration command.
7-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the System Time and Date The access group keyw ords are scanned in this orde r, from least restricti ve to most restr ictiv e: 1.
7-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the System Time and Date T o re-enable receipt of NTP pack ets on an interface, use the no ntp disable interf ace configuration command.
7-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the System Time and Date Configuring Time and Date Manually If no other source of time is av ai lable, you can manu ally conf igure the time and date after the system is restarted.
7-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the System Time and Date • .
7-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the System Time and Date The first part of the clock summer -time global conf iguration command specifi es when summer time begins, and the second part specif ies when it ends.
7-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Configuring a System Nam e and Prompt The first part of the clock summer -time global conf iguration command specifi es when summer time begins, and t he second part specif ies when it ends.
7-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Configuring a System Name and Prompt • Config uring a System Name, page 7-15 • Understanding DNS, page 7- 15 Default System Name and Prompt Configuration The default switch system name and prom pt is Switch .
7-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Configuring a System Nam e and Prompt Default DNS Configuration Ta b l e 7-2 show s the default DNS co nfigu ration.
7-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Creating a Banner If you use the switch IP address as its hostname, th e IP address is used and no DNS query occurs. If you confi gure a hostname that contains no periods (.
7-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Creating a Banner T o delete the MO TD banner , use the no banner motd global conf iguration command.
7-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the MAC Address Table T o delete the login banner , use the no banner login global conf iguration command.
7-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the MAC Address Table • Adding and Remo ving Static Address Entries, page 7-23 • Config uring Unicast MA C Address Filtering, page 7-2 4 • .
7-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the MAC Address Table Changing the Address Aging Time Dynamic addresses are source MAC addresses that the sw itch learns and then ages when they are not in use.
7-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the MAC Address Table Beginning in priv ileged EXEC mode, foll ow th .
7-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the MAC Address Table T o disable the switch from sending MA C address notif ication traps, use the no snmp-serv er enable traps mac-notif ication global conf iguration command.
7-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the MAC Address Table Beginning in pri vileged EXEC mod e, follow the.
7-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 7 Administering the Switch Managing the MAC Address Table • If you add a unicast MA C address as a stati.
7-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 7 Administerin g the Switch Managing the ARP Table Managing the ARP Table T o communicate with a de vice (ov er Ethernet, for ex ample), the softw are first must determi ne the 48-bit MA C or the local data link address of that de vice.
CH A P T E R 8-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 8 Configuring Switch-Based Authentication This chapter describe s ho w to configure switch-based authentica tio n on the Catalyst 2950 or Catalyst 2955.
8-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Protecting Acce ss to Privileged EXEC Comma nds Protecting Acce.
8-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Protecting Ac cess to Privileged EXE C Commands Setting or Changing a Static Enable Password The enable password controls acces s to the pri vileged EX EC mode.
8-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Protecting Acce ss to Privileged EXEC Comma nds Protecting Enab.
8-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Protecting Ac cess to Privileged EXE C Commands Use the level keyw ord to def ine a password for a specif ic pri vilege le vel.
8-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Protecting Acce ss to Privileged EXEC Comma nds Beginning in pr.
8-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Protecting Ac cess to Privileged EXE C Commands T o remove the passw ord, use the no password global conf iguration command .
8-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Protecting Acce ss to Privileged EXEC Comma nds T o disable userna me authenticatio n for a specific user , use the no username name global configuration command.
8-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Protecting Ac cess to Privileged EXE C Commands When you set a command to a privilege le vel, all commands whose syntax is a subset of that command are also set to that le vel.
8-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with TACACS+ Logging into and Exitin.
8-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Swit ch Access w ith TACACS+ Figur e 8-1 T ypical T.
8-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with TACACS+ TACACS+ Operation When a user attempts a simple ASCII log in by authenticati ng to a switch by using T ACA CS+, this process occurs: 1.
8-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Swit ch Access w ith TACACS+ • Config uring T A C.
8-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with TACACS+ T o remove the specified T ACA CS+ server name or address, use the no tacacs -server host hostname global conf iguration command.
8-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Swit ch Access w ith TACACS+ T o disable AAA, use the no aaa new-model global conf iguration command.
8-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with TACACS+ Configuring TACACS+ Authorization for Pr ivileged EXEC Access and Network Services AAA authorization limit s the servi ces a vailable to a user.
8-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Switch Access with RADIUS Beginning in priv ileged .
8-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with RADIUS The RADIUS host is normally a mu ltiuser system running RADIUS server software from Cisco (Cisco Secure Access Control Server v ersion 3.
8-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Switch Access with RADIUS Figur e 8-2 T ransitioni .
8-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with RADIUS A method list def ines the sequence and methods to be used to authenticate, to au thorize, or to keep accounts on a user.
8-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Switch Access with RADIUS If two dif ferent host en.
8-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with RADIUS Beginning in priv ileged EXEC mode, foll ow these steps to conf igure per-serv er RADIUS server communication.
8-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Switch Access with RADIUS This exampl e sho ws how .
8-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with RADIUS Step 3 aaa authentication login { default | list-name } method1 [ method2..
8-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Switch Access with RADIUS T o disable AAA, use the no aaa new-model global conf iguration command.
8-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with RADIUS Beginning in pri vileged.
8-27 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Switch Access with RADIUS T o remove the specified RADIUS server , use the no radius-server host hostname | ip-addr ess global confi guration command.
8-28 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with RADIUS T o disable authorization, use the no aaa authorization { network | exec } method1 global configuration command.
8-29 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Switch Access with RADIUS T o return to the default setting f or the retransmit, timeout, and deadtime, use the no forms of these commands.
8-30 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Controlling Switch Access with RADIUS This example sho ws how .
8-31 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Controlling Switch Access with RADIUS T o delete the vendor -proprietary RADIUS host, use the no radius-server host { hostname | ip-addr ess } non-standard global conf iguration command.
8-32 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Configuring the Switch for Lo cal Authentication and Authoriza.
8-33 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Configuring th e Switch for Se cure Shell Configuring the Switch for Secure Shell This section describes how to configure the Secure Sh ell (SSH) feature.
8-34 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Configuring the Switch for Secure Shell • T A CACS+ (for mor.
8-35 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Configuring th e Switch for Se cure Shell Cryptographic Softwar.
8-36 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Configuring the Switch for Secure Shell T o delete the RSA ke y pair , use the crypto key zeroize rsa global conf iguration command.
8-37 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 8 Configuri ng Switch-Based Authentication Configuring th e Switch for Se cure Shell Displaying the SSH Co.
8-38 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 8 Config uring Switch-Based Authentic ation Configuring the Switch for Secure Shell.
CH A P T E R 9-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 9 Configuring IEEE 802.1x Port-Based Authentication This chapter describes ho w to configure IEEE 802.1x port-based authen tication on the Catalyst 2950 or Catalyst 2955 switch.
9-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802. 1x Port-Based Authentication • Using IEEE 802.1x Auth entication with VLAN A ssignment, page 9-7 • Using IEEE 802.
9-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802.1x Po rt-Based Authentication information wit h the authentication serv er , and rela ying a response to the client.
9-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802. 1x Port-Based Authentication Figur e 9-2 Messag e Exc hang e Ports in Authorized and Unauthorized States During IEEE 802.
9-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802.
9-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802.
9-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802.1x Po rt-Based Authentication For mo re i nf or m at io n ab ou t A V pa i rs , s e e R F C 3 58 0 , “IEEE 802.
9-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802. 1x Port-Based Authentication • Enable IEEE 802.1x authen tication (the VLAN assignment feature is automatically enabled when you conf igure IEEE 802.
9-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802.1x Po rt-Based Authentication Using IEEE 802.1x Authentication with Restricted VLAN Y ou can configure a restricted VLAN for each IEEE 802.
9-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802.
9-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Understanding IEEE 802.
9-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication • Set the action to be tak en when the switch tries to re-authenticate the cli ent by using the T ermination-Action RADIUS attribut e (Attribut e[29]).
9-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication IEEE 802.1x Authentication Configuration Guidelines These section has configuration guidelines for these features: • IEEE 802.
9-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication IEEE 802.1x Authentication These are the IEEE 802.1x authenti cation configuration guidelines: • When IEEE 802.
9-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication client times out and tr ies to get a host IP address from the DHCP serv er .
9-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Step 6 The switch sends an interim accountin g update to the ac counting server that is based on the result o f re-authentication.
9-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication T o disable AAA, use the no aaa new-model global configuration command.
9-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication T o delete the specified RADIUS server , use the no radius-server host { hostname | ip -addr ess } global confi guration command.
9-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Enabling Periodic Re-Authentication Y ou can enable periodic IEEE 802.
9-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Changing the Quiet Period When the switch cannot auth enticate the client, the switch remains idle for a set period of time, and then tries again.
9-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication T o return to the default retransmission time, use the no dot1x timeout tx-period interface conf iguration command.
9-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Configuring IEEE 802.1x Accounting Enabling AAA system accounting with IEEE 802.
9-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Configuring a Guest VLAN When you configure a guest VLAN, clients that are not IEEE 802.
9-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Y ou can enable optional guest VLAN beha vior by using the dot1x guest-vlan suppli cant global configuration command.
9-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Beginni ng in pri vileged EXEC mode, foll ow t hese steps to conf igure a restricted VLAN.
9-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication T o return to the default v alue, use the no dot1x auth-fail max-attempts interface conf iguration command.
9-27 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Configuring IEEE 802.1x Authentication Configuring NAC Layer 2 IEEE 802.1x Validation In Cisco IOS Release 12.
9-28 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 9 Configuring IEEE 802.1x Port-Based Authentication Displaying IEEE 802.1x Statistics and Status Resetting the IEEE 802.1x Configuration to the Default Values Beginning in pri vileged EXEC mode, follow these steps to reset the IEEE 802.
CH A P T E R 10-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 10 Configuring Interface Characteristics This chapter describes the ty pes of interfaces on a Catalyst 29 50 or Catalyst 2955and ho w to conf igure them.
10-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Understanding Interface Types These sections describes these typ.
10-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 10 Configuring Interfac e Characteristics Understanding Interface Types A trunk port can onl y become a member of a VLAN if VTP kno ws of the VLAN and the VLAN is in the enabled state.
10-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Using the Interface Command When you conf igure an EtherChannel, you create a port -channel logical in terfa ce and assign an interface to the EtherChannel.
10-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 10 Configuring Interfac e Characteristics Using the Inte rface Command Y ou can identify physical interfaces b y physically checking the interf ace location on the switch.
10-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Using the Interface Command Beg i nn in g i n pr ivi leg e d E X.
10-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 10 Configuring Interfac e Characteristics Using the Inte rface Command This example sho ws how to use a co.
10-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Configuring Ethernet Inte rfaces – port-channel port-chann el-number - port-c hannel-number , where port-c hannel-nu mber is from 1 to 6.
10-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 10 Configuring Interfac e Characteristics Configuring Ethernet Interfaces • Config uring Media T ypes for Gigabit Ethe rnet I nterfaces on LRE Switches, page 10-13 • Configuring I EEE 802.
10-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Configuring Ethernet Inte rfaces Configuring Interface Speed and Duplex Mode The 10/100 Ethernet int erfaces on a non-LRE switch operate in 10 or 100 Mbps and in ei ther full- or half-duple x mode.
10-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 10 Configuring Interfac e Characteristics Configuring Ethernet Interfaces • When connecting an interfac.
10-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Configuring Ethernet Inte rfaces Setting the Interface Speed an.
10-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 10 Configuring Interfac e Characteristics Configuring Ethernet Interfaces Use the no local speed and no local duplex interface conf iguration commands to return the interf ace to the default speed and duplex setti ngs.
10-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Configuring Ethernet Inte rfaces • rec ei ve on (or desired ).
10-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 10 Configuring Interfac e Characteristics Monitoring and Ma intaining the Interfaces Use the no description interface co nfigu ration command to delete the descriptio n.
10-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Monitoring an d Ma intaining the Interfaces Monitoring Interfac.
10-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 10 Configuring Interfac e Characteristics Monitoring and Ma intaining the Interfaces T o clear the interface counters shown by the show interfaces privile ged EXEC command, use the clear counters pri vileged EXEC command.
10-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 10 Configur ing Interface Characteristics Monitoring an d Ma intaining the Interfaces When the shutdown interf ace conf iguration command i s entered on an LRE interface, t he LRE link is shut do wn.
CH A P T E R 11-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 11 Configuring Smartports Macros This chapter describes ho w to configure an d apply Smartports macros on t he Catalyst 2950 switch.
11-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 11 Configur ing Smartport s Macros Configuring Smartports Macros Cisco also provides a collection of pretested, Ci sco-recommended baseline conf iguration templates for Catalyst switches.
11-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 11 Configuring Smartports Macros Configuring Smartports Macros Smartports Macro Configuration Guidelines F.
11-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 11 Configur ing Smartport s Macros Configuring Smartports Macros Creating Smartports Macros Beginning in p.
11-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 11 Configuring Smartports Macros Configuring Smartports Macros Applying Smartports Macros Beginning in pri.
11-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 11 Configur ing Smartport s Macros Configuring Smartports Macros This e xample sho ws how to ap ply the us.
11-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 11 Configuring Smartports Macros Configuring Smartports Macros Y ou can delete a global macr o-applied conf iguration on a swi tch only b y entering the no version of each command that is in th e macro.
11-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 11 Configur ing Smartport s Macros Displaying Smartports Ma cros Displaying Smartports Macros T o display the Smartports macros, use one or more of the privileged EXEC commands in Ta b l e 11-2 .
CH A P T E R 12-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 12 Configuring LRE This chapter describe s ho w to configure the Lo ng-Reach Ethernet (LRE) features on your Catalyst 29 50 LRE switch.
12-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Understanding LRE Features • LRE link—This is the co nnection between the switch LRE port and the RJ-11 w all port on an LRE CPE de vice such as the Cisco 575 LRE CPE or the Cisc o 585 LRE CPE.
12-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Understanding LRE Features Note Use the rates and distances in Ta b l e 12-1 and Ta b l e 12-2 only as guidelines.
12-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Understanding LRE Features Y o ur data rates will always be less than th e gross data rate listed in tables.
12-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Understanding LRE Features LRE Sequences The LRE switches are shipped with predefined sequences. Sequences are sets of profiles and are used with the rate selection feature.
12-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Understanding LRE Features Beginni ng with the f irst prof ile in a sequence, t he switch attempts to app ly each prof ile within that sequence to the LRE interf ace.
12-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Understanding LRE Features CPE toggle cannot be disabled on a Ci sco 575 LRE or Cisco 57 6 LRE 997 CPE link b ut can be disabled on a Cisco 585 LRE CPE.
12-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Configuring LRE Ports • Event—The switch logs only LRE e vents. • Extended— The switch logs LRE e ven ts and all the LRE paramet ers.
12-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Configuring LRE Ports • Rate selectio n is enabled on al l interfaces, but a se quence with which to start rat e selection is not defined.
12-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Configuring LRE Ports – Older installations o ver 30 years old often use hea vy gauge wire (2 2 or 20 A WG) with no signif icant twist.
12-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Configuring LRE Ports Guidelines for Configuring Cisco 575 LRE CPEs and 576 LRE 997 CP.
12-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Configuring LRE Ports The loopback interf ace conf iguration command is not supported on the LRE ports. Ext ernal loopback on the LRE ports is also not sup ported.
12-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Configuring LRE Ports T o delete the prof ile from a sequence, use the no prof ile pr of ile-name interface conf iguration command.
12-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Configuring LRE Ports T o remove a sequence from a port, use the no sequence sequence- name interface conf iguration command.
12-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Configuring LRE Ports Precedence The rate selection feature can be applied at bot h th e port le vel and at the swi tch lev el.
12-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Configuring LRE Ports Link Qualification and SNR Margins When rate selection is running, the SNR is u sed as an indicator of lin k qualit y .
12-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Configuring LRE Ports Ta b l e 12-7 SNR Requirements f or Upstr eam Rates for the Cata.
12-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Configuring LRE Ports The margin ran ge for link qualif ication is from 1 to 10 dB. The recommended valu e in a lo w-noise en vironment is 2 dB.
12-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Configuring LRE Ports Configuring LRE Link Persistence If the LRE link shuts do wn and is automatically re-enabled quickly , the switch config uration might change.
12-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Configuring LRE Ports A lo wer v alue of the interlea ve block size means less tole rance to noise and causes a lo wer latency of frame transmis sion.
12-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Configuring LRE Ports • Make sure that all t he CPEs in the prod uction network are runnin g the same LRE binary version .
12-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Configuring LRE Ports T o re-enable CPE toggle on the Cisco 585 LRE CPE link, use the cpe toggle [ port port -id ] interface confi guration command.
12-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Upgrading LRE Switch Firmware T o turn of f the logging of e vents, use the no logging lr e { eve nt | extended | normal } interface confi guration command.
12-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Upgrading LRE Switch Firmware Note Y ou must remo ve global conf igurations that might af fect t he controll er and de vices connected to it.
12-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Upgrading LRE Switch Firmware Y ou can use the upgrade controller conf iguration command to ov erride the system def ault selection of an LRE binary that will b e applied on either end of a particular LRE link.
12-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Upgrading LRE Switch Firmware ! controller LongReachEthernet 1 ! controller LongReach.
12-27 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 12 Configuring LRE Displaying LRE St atus Displaying LRE Status T o display the LRE informat ion, use one or more of th e pri vileged EXEC command s in Ta b l e 12-10 .
12-28 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 12 Configurin g LRE Displaying LRE Status.
CH A P T E R 13-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 13 Configuring STP This chapter describe s ho w to configure the Spanning T ree Pro tocol (STP) on port-based VL ANs on your Catalyst 2950 or Catal yst 2955 switch.
13-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Understandin g Spanning-T ree Features • Spanning-T ree Interoperability and Backw ard Compatibility , page 13-10 • STP and IEEE 802.
13-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Understanding Spa nning-Tree Features When the switches in a network are powered up, each functions as the root switch. Each switch sends a confi guration BPDU through al l of its ports.
13-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Understandin g Spanning-T ree Features In Cisco IOS Release 12.1(9)EA1 a nd later , Catalyst 2950 and Catalyst 2955 switches support the IEEE 802.
13-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Understanding Spa nning-Tree Features • From forwarding to dis abled Figure 13-1 illustrates how an interf ace mo ves through the states.
13-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Understandin g Spanning-T ree Features • Receiv es BPDUs Listening State The listening state is the first state a Layer 2 interf ace enters after the blocking state.
13-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Understanding Spa nning-Tree Features How a Switch or Port Becomes the Root Switch or R.
13-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Understandin g Spanning-T ree Features Figur e 13-3 Spanning T ree and Re dundant Connectivity Y ou can also create redundant links b etween sw itches by using Et herChannel groups.
13-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Understanding Spa nning-Tree Features Spanning-Tree Modes and Protocols The switch support s these spanning-tre e modes and protocol s: PVST+—This spanning-tree mode is based on the IEEE 802.
13-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Configuring Sp anning-Tree Featur es Spanning-Tree Interoperabi lity and Backward Compatibility Ta b l e 13-2 lists the interoperability an d compatibility among t he supported spanning-tree modes in a network.
13-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Configuring Spa nning-Tree Features • Config uring the Root Swit ch, page 13-14 (opt.
13-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Configuring Sp anning-Tree Featur es If 64 instances of spanning tree are alread y in use, you can disable spanning tree on one of t he VLANs and then enable it on the VLAN wh ere you want it to run .
13-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Configuring Spa nning-Tree Features T o return to the defau lt setting, use the no spanning-t ree mode global co nfigu ration command.
13-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Configuring Sp anning-Tree Featur es Beginning in pri vileged EXEC mode, follo w these steps to disable spannin g tree on a per -VLAN basis.
13-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Configuring Spa nning-Tree Features • For Catalyst 2950 swi tches without the ex tended system ID (softw are earlier than Cisco IOS Release 12.
13-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Configuring Sp anning-Tree Featur es T o return the switch to its default setting, use the no spanning-tr ee vlan vlan-id roo t global confi guration command.
13-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Configuring Spa nning-Tree Features T o return the switch to its default setting, use the no spanning-tr ee vlan vlan-id roo t global confi guration command.
13-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Configuring Sp anning-Tree Featur es Note The show spanning-tr ee interface interfac e-id pri vilege d EXEC command displays informati on only if the port is in a link-up operativ e s tate.
13-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Configuring Spa nning-Tree Features Note The show spanning-tr ee interface interfac e-id pri vilege d EXEC command displays informati on only for ports that are in a link-up operati ve state.
13-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Configuring Sp anning-Tree Featur es T o return the switch to its default setting, use the no spanning-tr ee vlan vlan-id priority global confi guration command.
13-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Configuring Spa nning-Tree Features Configuring the Forwardi ng-Delay Time for a VLAN Beginni ng in pri vileged EXEC mod e, follo w these steps to conf igure the forwarding-delay time for a VLAN.
13-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Configuring Sp anning-Tree Featur es Configuring Spanni ng Tree for Use in a Cascaded Stack Spanning tree uses def ault va lues that can be reduced when configuring your switch in cascaded configurations.
13-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 13 Configuring STP Displaying the Spanning -Tree Status Displaying the Spanning-Tree Status T o display t.
13-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 13 Configur ing STP Displaying the Sp anning-Tree Status.
CH A P T E R 14-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 14 Configuring MSTP This chapter describe s ho w to configure the Cisco im plementation of the IEE E 802.1s Multiple STP (MSTP) on your Catalyst 2950 or Catalyst 29 55 switch.
14-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Understandi ng MSTP Understanding MSTP MSTP , which uses RSTP for rapid co n verge nc.
14-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Understanding M STP All MST instances within the same re gion share the same protocol timers, bu t each MST instance has its o wn topology parameters, such as root switch ID, root path cost, and so fort h.
14-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Understandi ng MSTP Figur e 14-1 MST Regions, IST Masters, and the CS T Root Figure 14-1 does not sho w additional MST instances for each reg ion.
14-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Understanding M STP recei ved remaining hop count b y one an d propagates this v alue as the rem aining hop count i n the BPDUs it generates.
14-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Understandi ng RSTP Understanding RSTP The RSTP takes adv antage of point-to-poi nt wiring and pro vides rapid con vergence of the spanning tree.
14-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Understanding RST P T o be consistent with Cisco STP implementations, th is guide def ines the port state as bloc king instead of discar ding .
14-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Understandi ng RSTP Figur e 14-2 Proposal and Agr eement Hand shaking for Rapid Conv .
14-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Understanding RST P Figur e 14-3 Seq uence of Events Dur ing Rapid Conv erg ence Bridge Protocol Data Unit Format and Processing The RSTP BPDU format is the same as the IEEE 8 02.
14-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Understandi ng RSTP The RSTP does not ha ve a separate topology change notificat ion (TCN) BPDU. It uses the topolog y change (TC) flag to sho w the to pology changes.
14-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Configuring MSTP Features • Protocol migration—F or backward compatibilit y with IEEE 802.1D switches, RSTP selecti vely sends IEEE 802.
14-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Configuring MSTP Features For info rmation about the supported number of spanning-tree instan ces, see the “Support ed Spanning-Tree Instances” section on page 13-9 .
14-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Configuring MSTP Features Specifying the MST Region Configuration and Enabling MSTP F.
14-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Configuring MSTP Features T o return to the default MST region conf iguration, use the no spanning-tree mst conf iguration global confi guration command.
14-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Configuring MSTP Features Use the diameter keyw ord, which is a vai lable only for MS.
14-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Configuring MSTP Features Y ou can execute this command on more than one sw itch to conf igure mu ltiple backup roo t switches.
14-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Configuring MSTP Features Beginning in pri vileged EXEC mod e, follo w these steps to conf igure the MSTP port priority of an interface.
14-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Configuring MSTP Features Note The show spanning-tr ee mst interface interfac e-id pri vilege d EXEC command displays informati on only for ports that are in a link-up oper ati ve sta te.
14-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Configuring MSTP Features Beginni ng in pri vileged EXEC mode, follo w these steps to conf igure the switch priority . This procedure is optio nal.
14-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Configuring MSTP Features T o return the switch to its default setting, use the no spanning-tree mst hello-time global configuration command.
14-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 14 Configuring MSTP Configuring MSTP Features T o return the switch to its def a ult setting, use th e no spanning-tree mst max-age global co nfiguration command.
14-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 14 Configuring M STP Displaying the MST Configuration and Status T o return the switch to its default setting, use the no spanning-tr ee link-type interface configuration command.
CH A P T E R 15-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 15 Configuring Optional Spanning-Tree Features This chapter describes ho w to configu re optional spanning -tree features on your Catalyst 2 950 or Catalyst 2955 switch.
15-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Unde rstanding O ptional Span ning-Tree Fe atures Underst.
15-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Understanding Optio nal Spanning-Tree Features The BPDU guard feature pro vides a secure response to in v alid conf igurations because y ou must manually put the port b ack in service.
15-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Unde rstanding O ptional Span ning-Tree Fe atures Figur e.
15-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Understanding Optio nal Spanning-Tree Features Figur e 15.
15-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Unde rstanding O ptional Span ning-Tree Fe atures How CSUF Works CSUF ensure s that one link in t he stack is electe d as the path to th e root.
15-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Understanding Optio nal Spanning-Tree Features The switch.
15-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Unde rstanding O ptional Span ning-Tree Fe atures Limitat.
15-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Understanding Optio nal Spanning-Tree Features Figur e 15.
15-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Unde rstanding O ptional Span ning-Tree Fe atures to the root swit ch).
15-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Understanding Optio nal Spanning-Tree Features Figur e 1.
15-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Unde rstanding O ptional Span ning-Tree Fe atures Y ou can enable this feature by u sing the spanning-tree ether channel guard misconfig global confi guration command.
15-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Configuring Optio nal Spanning-Tree Features Understandi.
15-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Configuring Option al Spanning-Tree Featur es Optional S.
15-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Configuring Optio nal Spanning-Tree Features Note Y ou can use the spanning-tree portfast default global conf iguration comma nd to globally enable the Port Fast feature on all nontrun king ports.
15-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Configuring Option al Spanning-Tree Featur es Beginni ng in pri vileged EXEC mode, follo w these steps to globally enable the BPDU guar d feature.
15-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Configuring Optio nal Spanning-Tree Features T o disable BPDU fi ltering, use the no spanning-tr ee portfast bpdufilter default global con figur ation command.
15-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Configuring Option al Spanning-Tree Featur es When UplinkFast is enabled, the sw itch priority of all VLANs is set to 49152 .
15-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Configuring Optio nal Spanning-Tree Features Enabling BackboneFast Y ou can enable BackboneFast to detect indirect li nk failures and to start the spanning-tree reconfiguration sooner .
15-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Configuring Option al Spanning-Tree Featur es After the .
15-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 15 Configuring Optiona l Spanning-Tree Feature s Displaying the Spanning -Tree Status T o globally disable loop g uard, use the no spanning-tr ee loopguard default global configuratio n command.
15-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 15 Configur ing Optional Spanning-Tree Featu res Displaying the Sp anning-Tree Status.
CH A P T E R 16-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 16 Configuring VLANs This chapter describes ho w to config ure normal-range VLANs on your Catalyst 2950 or Catalyst 295 5 . It includes information about VLAN modes and th e VLAN Membership Policy Serv er (VMPS).
16-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Understandi ng VLANs Figure 16-1 sho ws an example of VLANs seg mented into logically def ined networks. Figur e 16-1 VLANs as Logically Defined Ne tw or ks VLANs are often associated with IP subnet works.
16-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Understanding VLAN s VLAN Port Membership Modes Y ou configure a port to belong to a VLAN by assignin g a memb ership mode that determines the kind of traff ic the port carries and the numb er of VLANs to which it can belong.
16-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring Norma l-Range VLANs Configuring Normal-Range VLANs Normal-range VLANs are VLA Ns with VLAN IDs 1 to 1005.
16-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring Normal-Rang e VLANs • Normal-Range VLAN Co nf ig uration Guidelines, pa.
16-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring Norma l-Range VLANs are se veral adjacent switches that all hav e run out of spanning-tree instances.
16-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring Normal-Rang e VLANs startup configuration f ile. Y ou can use the show running-conf ig vlan pri vile ged EXEC command to display the switch running conf iguration file.
16-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring Norma l-Range VLANs Creating or Modifying an Ethernet VLAN Each Ethernet VLAN in the VLAN databa se has a unique, 4-digit ID that can be a number fro m 1 to 1001.
16-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring Normal-Rang e VLANs Beginning in pri vileged EXEC mode, follow these step.
16-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring Norma l-Range VLANs Beginni ng in pri vileged EXEC mode, follo w these .
16-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring Extende d-Range VLANs This example sho ws how to conf igure a port a s an access port in VLAN 2: Switch# configure terminal Enter configuration commands, one per line.
16-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring Exten ded-Range VLANs • The switch must be in VTP tran sparent mode when you create ex tended -range VLANs. If VTP mode is server or client, an error message is gene rated, and the e xtended-ra nge VLAN is rejected.
16-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Displaying VLANs T o delete an extended-range VLAN, use t he no vlan vlan-id global conf iguration command. The procedure for assigning static-access ports to an extended-range VLAN is the same as for normal-range VLANs.
16-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VLAN Tr unks Trunking Overview A trunk is a point-to-point link between one or more Ethernet switch inte rfaces and another networking de vice such as a router or a switch.
16-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring VLAN Trunk s – Manually shut do wn the GigaStack port by usin g the shutdown interf ace configuration command.
16-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VLAN Tr unks Default Layer 2 Ethernet Interface VLAN Configuration Ta b l e 16-5 shows th e default Layer 2 Ethernet interface V LAN conf iguration.
16-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring VLAN Trunk s • A port in dynam ic mode can ne gotiate with its neig hbor to become a trunk port. If you tr y to enable IEEE 802.
16-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VLAN Tr unks Defining the Allowed VLANs on a Trunk By default, a trunk port sends traf fic to and rece i ves traf fic from all VLANs.
16-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring VLAN Trunk s This example sh ows ho w to remove VLAN 2 from the allo wed.
16-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VLAN Tr unks Beginning in pri vileged EXEC mo de, follow these steps to conf ig ure the native VLAN on an IEEE 802.
16-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring VLAN Trunk s In this way , T runk 1 carries traf fic for VLANs 8 through 10, and T runk 2 carries traf fic for VL ANs 3 through 6.
16-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VLAN Tr unks Load Sharing Usin g STP Path Cost Y ou can configure paral lel trunks to share VLAN traf fic b y setting dif ferent path costs on a trunk and associating the path costs with dif ferent sets of VLANs.
16-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring VMPS Configuring VMPS The switch cannot be a VMPS server but can act as a client to the VMPS and commun icate with it through the VLAN Query Protocol (VQP).
16-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VMPS In response to a request, the VMPS takes one o f these actions: .
16-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring VMPS Y o u can configure a fallback VLAN na me. If you connect a device with a MA C address that is no t in the database, the VMPS sends the f allback VLAN name to the client.
16-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VMPS • Port channels cannot be conf igured as dynamic access ports. • The VTP mana gement domain of the VMPS clie nt and the VMPS server must be the same.
16-27 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring VMPS Beginni ng in pri vileged EXEC mode, follo w these steps to conf ig.
16-28 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VMPS Beginni ng in pri vileged EXEC mod e, follo w these steps to change the recon firmation i nterv al: T o return the switch to its default setting, use the no vmps re confirm glob al conf iguration command.
16-29 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLANs Configuring VMPS This is an example of output for the show vmps pri vileged EXEC com.
16-30 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 16 Configuring VLA Ns Configuring VMPS Figur e 16-5 Dynamic Por t VLAN Membe rship Configur at ion Primar y VMPS Ser v er 1 Catalyst 6500 series Secondar y VMPS Ser v er 2 Catalyst 6500 series Secondar y VMPS Ser v er 3 172.
CH A P T E R 17-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 17 Configuring VTP This chapter describe s ho w to use the V LAN T r un king Protocol (V TP) and the VLAN database for managing VLANs on your Catalyst 2950 or Catalyst 2955 switch.
17-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 17 Configur ing VTP Understandi ng VTP The VTP Domain A VTP domain (also called a VLAN management domain) consist s of one switch or se veral interconnected switches und er the same administrat i ve responsibility sharing th e same VTP domain name.
17-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 17 Configuring VTP Understanding VT P When the networ k is confi gured with more than the maximum 25 0 VLA.
17-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 17 Configur ing VTP Understandi ng VTP • VLAN state • Additional VLAN conf iguration information speci fic to the VLAN typ e VTP Version 2 If you use VTP i n your network, you must decide whether to use version 1 or version 2.
17-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 17 Configuring VTP Understanding VT P Figur e 1 7 -1 Floo ding T raf fic wit hout VTP Pr uning Figure 17-2 sho ws a switched netw ork with VTP pruni ng enabled.
17-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 17 Configur ing VTP Configuring VTP • T urn off VTP pruni ng by making all VLANs on the trunk of th e switch upstream to the VTP transparent switch prunin g ineligible.
17-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 17 Configuring VTP Configuring VTP VTP Configuration in Global Configuration Mode Y o u can use the vtp gl.
17-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 17 Configur ing VTP Configuring VTP VTP Configuration Guidelines These sections describe guidelines you should follo w when implem enting VTP in your netw ork.
17-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 17 Configuring VTP Configuring VTP VTP Version Follo w these guidelines wh en decidi ng which VTP versio n to implem ent: • All switches in a VTP domain mu st run the same VTP version.
17-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 17 Configur ing VTP Configuring VTP When you conf igure a domain name, it cannot be remo ved; you can only reassign a swi tch to a dif ferent domain. T o return the switch to a no-password state, use the no vtp passw ord global conf iguration command.
17-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 17 Configuring VTP Configuring VTP This exampl e shows h ow to use VLAN conf iguration mode to confi gure.
17-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 17 Configur ing VTP Configuring VTP Use the no vtp mode global configur ation command to return the switch to VTP server mode . T o return the switch to a no-password state, use the no vtp password global co nfigu ration command.
17-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 17 Configuring VTP Configuring VTP Note If extended-range VLANs are configured on the swit ch, you cannot change VTP mode to server . Y ou recei ve an error messa ge, and the conf iguration is not al lo wed.
17-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 17 Configur ing VTP Configuring VTP Enabling VTP Pruning Pruning increases a vail able bandwidth b y restricting flood ed traff ic to those trunk links that t he traff ic must use to access the destination de vices.
17-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 17 Configuring VTP Monitoring VTP Beginni ng in pri vileged EXEC mod e, follo w these steps to verify an .
17-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 17 Configur ing VTP Monitoring VTP Ta b l e 17 -3 VTP Moni t or ing Commands Command Purpose show vtp status Display the VTP switch co nfiguration information.
CH A P T E R 18-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 18 Configuring Voice VLAN This chapter d escribes how to configure the v oice VLAN feature on your Catalyst 2950 or Catalyst 2955 switch. V oice VLAN is sometime s referred to as an auxiliary VLAN in the Cat alyst 6000 famil y switch documentation.
18-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 18 Configurin g Voice VLAN Configuring Voice VLAN Figur e 18-1 Cisco 7960 IP Phone Connect ed to a Switc h When the IP Phone connects to the switch, the acce ss port (PC-to-telephone jack) of the IP phone can connect to a PC.
18-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 18 Configuring Voice VLAN Configuring Vo ice VLAN Voice VLAN Configuration Guidelines These are the voice VLAN conf iguration guidelines: • Y o u should configure voice VLAN on switch acc ess ports.
18-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 18 Configurin g Voice VLAN Configuring Voice VLAN • Config uring the IP Phone to T rust the CoS Priority of Incoming Data Frames, p age 18-5 Configuring Ports to Carry Voice Traffic in IEEE 802.
18-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 18 Configuring Voice VLAN Configuring Vo ice VLAN Overriding the CoS Priority of Incoming Data Frames Y o u can connect a PC or ot her data device to a Cisco 7960 IP Phone port.
18-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 18 Configurin g Voice VLAN Displaying Voice VLAN Use the no switchport priority extend interface conf iguration command or the switchport pri ority extend cos 0 interface conf iguration command to return the port to its default set ting.
CH A P T E R 21-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 21 Configuring Port-Based Traffic Control This chapter describes h ow to configure t he port-based traf fic control features on your Catalyst 29 50 or Catalyst 29 55 switch.
21-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Storm Control Storm control uses one of th ese meth.
21-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Storm Control T o disable storm control, use the no storm-contr ol br oadcast leve l , the no storm-contr ol multicast level , or the no storm-control un icast lev el interface co nfiguratio n command.
21-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Protec ted Ports Configuring Protected Ports Some a.
21-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Port B locking Configuring Port Blocking By default, the sw itch floods packet s with unkno wn destination MA C addresses to all ports.
21-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Port Security Resuming Normal Forwarding on a Port .
21-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Port Security • Stic ky secure MA C address es—These can be dynamically learned or manually conf igured, stored in the address table, and added t o the running conf iguration.
21-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Port Security Ta b l e 21-1 shows th e violation mode and t he actions taken when y ou conf igure an interface for port security .
21-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Port Security • When a voice VLAN is conf igured .
21-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Port Security T o return the interface to the default condition as not a secure po rt, use the no switchport port- security interface conf iguration command.
21-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Port Security T o disable sticky learning on an interface, use the no switchport port-security mac-address stick y interface configuration command.
21-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Configuring Port Security Beginni ng in pri vileged EXEC mode,.
21-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Displaying Po rt-Based Tr affic Control Se ttings Displaying P.
21-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 21 Configuri ng Port-Based Traffic Control Displaying Port-Based Traffic Control Settings.
CH A P T E R 19-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 19 Configuring DHCP Features This chapter describes ho w to conf igure DHCP snooping and t he option-82 data inserti on features on the Catalyst 29 50 or Catalyst 2955 switch.
19-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 19 Config uring DHCP Feat ures Understanding DHCP Features DHCP Server The DHCP server assigns IP addr esses from specified ad dress pools on a switch or router to DHCP clients and manages them.
19-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 19 Configuring DHCP Fea tures Understanding DHCP Feature s The switch drops a DHCP packet when one of thes.
19-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 19 Config uring DHCP Feat ures Understanding DHCP Features Figur e 19-1 DHCP Relay A gent in a Metr opolit.
19-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 19 Configuring DHCP Fea tures Configuring DHCP Features The port numbers in the port fiel d of the ci rcuit-ID suboption start at 0.
19-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 19 Config uring DHCP Feat ures Configuring DHCP Feat ures DHCP Snooping Configuration Guidelines These are the conf iguration guidelines for DHCP snooping. • Y ou must globally enable DHCP snooping on the swi tch.
19-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 19 Configuring DHCP Fea tures Configuring DHCP Features Configuring the DHCP Server The Catalyst 2955 switch can act a s a DHCP server . By default, the Cisco IOS DHCP server and relay agent features are enabled on your switch but are not configured.
19-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 19 Config uring DHCP Feat ures Displaying DHCP Information T o disable DHCP snooping, use t he no ip dhcp snooping global conf iguration command.
CH A P T E R 20-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 20 Configuring IGMP Snooping and MVR This chapter describe s ho w to configure Internet Group M anage.
20-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Understanding IGMP Snooping the switch adds th e host port number to the forw ardi ng table entry; when i t receiv es an IGMP Leave Group message from a host, it remov es the host port from the tabl e entry .
20-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Understanding IGM P Snooping An IGMPv3 switch can receive messages from and forwar d messages to a de vice running the Source Specif ic Multicast (SSM) feature.
20-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Understanding IGMP Snooping Note that the switch hardw are can distinguish IGMP information pack ets from other packets for the multicast group.
20-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Understanding IGM P Snooping When hosts want to leav e a multicas t group, they can eithe r silently leave, or they can send a leave message.
20-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Configuring IGMP Snooping If the multicast router query al so includes requests for IGMPv3 reports, the swi tch forwards all IGMPv1, IGMPv2, and IGMPv3 reports for a group to the multicast d evices.
20-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Configuring IGM P Snooping • Config uring the Aging T ime, page 20.
20-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Configuring IGMP Snooping T o disable IGMP snooping on a VLAN interf ace, use the no ip igmp snooping vlan vlan-id global confi guration command for t he specifi ed VLAN number .
20-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Configuring IGM P Snooping T o return to the defa ult learning method, use th e no ip igmp snooping vlan vlan-id mr outer lear n cgmp global conf iguration command.
20-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Configuring IGMP Snooping T o remove the Layer 2 port fr om the multicast group, use the no ip igmp snooping vlan vlan-id static mac-addr ess inter face interfa ce-id global conf iguration command.
20-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Configuring IGM P Snooping • The default lea ve time is 1000 milliseconds. • The IGMP confi gurable lea ve time is only support ed on hosts running IGMP V ersion 2.
20-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Configuring IGMP Snooping T o re-enable IGMP report suppression, use the ip i gmp snooping report-suppr ession gl obal confi guration command.
20-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Displaying IGMP Snooping Information Configuring the Aging Time Y ou can set the aging time for forwarding-table entries th at the switch learns by using the IP multicast-source-only le arning method.
20-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Understanding Mu lticast VLAN Registration For more inf ormation about the ke ywords and options in these commands, see the co mmand reference for this release.
20-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Understanding Multicast VLAN Registration The switch CPU identifies.
20-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Understanding Mu lticast VLAN Registration Figur e 20-3 Multicast VLAN Registr ation Example MVR eliminates the need to dupli cate tele vision-channel multicast tr af fic for subscribers in each VLAN.
20-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Configuring MVR Configuring MVR These sections include basic MVR co.
20-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Configuring MVR Configuring MVR Global Parameters Y ou do not need to set the optional MVR parameters i f you choose to use the default settin gs.
20-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Configuring MVR Switch(config)# mvr querytime 10 Switch(config)# mv.
20-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Displaying MVR Information T o return the interface to its de fault settings, use the no mvr [ type | immed iate | vlan vlan-id | group ] interface configuration commands.
20-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Configuring IGM P Filtering and Throttling Configuring IGMP Filteri.
20-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Configuring IGMP Filtering and Throttling When the maximum number of g roups is in forwar ding table, the defaul t IGMP throttling action is to deny the IGMP report.
20-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Configuring IGM P Filtering and Throttling Switch(config-igmp-profile)# permit Switch(config-igmp-profile)# range 229.
20-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Configuring IGMP Filtering and Throttling Setting the Maximum Numb.
20-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 20 Configuring IGMP Sn ooping and MVR Displaying IGMP Filterin g and Throttling Configuration – If you conf igure the throttling action as deny , the entries that were previously in t he forwarding table are n ot remov ed but are a ged out.
20-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 20 Config ur ing IGMP Snooping and MVR Displaying IGMP Filte ring and Throttling Configuration Use the pr.
CH A P T E R 22-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 22 Configuring UDLD This chapter descri bes how to configure the UniDirectional Li nk Detection (UD LD) protocol on you r Catalyst 2950 or Catalyst 29 55 switch.
22-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 22 Configuring UDLD Understanding UDLD A unidirectional link occurs whene ver traf fic sent by a local device is recei ved by its neighbor b ut traff ic from the neighbor is not receiv ed by the local de vice.
22-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 22 Configuring UDLD Configuring UDLD UDLD relies on echoing as i ts detection mechan ism.
22-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 22 Configuring UDLD Configuring UDLD Default UDLD Configuration Ta b l e 22-1 shows th e default UDLD con figur ation.
22-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 22 Configuring UDLD Configuring UDLD Enabling UDLD Globally Beginni ng in pri vileged EXEC mode, follow th.
22-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 22 Configuring UDLD Configuring UDLD T o disable UDLD on a non-f iber- optic interface, use th e no udld port interface conf iguration command.
22-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 22 Configuring UDLD Displaying UDLD Status Displaying UDLD Status T o display the UDLD status for the s pecifie d interface or for all interfaces, use the show udld [ interface- id ] pri vileged EXEC command.
22-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 22 Configuring UDLD Displaying UDLD Status.
CH A P T E R 23-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 23 Configuring CDP This chapter describes ho w to confi gure Cisco Disco very Protocol (CDP) on yo ur 2950 or Catalyst 2955 switch.
23-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 23 Configur ing CDP Configuring CDP Configuring CDP These sections include CDP configur ation infor mation.
23-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 23 Configuring CDP Configuring CDP Use the no form of the CDP commands to return to the def ault settings. This exampl e shows ho w to configu re CDP characteristics.
23-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 23 Configur ing CDP Monitoring and Maintaining CDP Disabling and Enabling CDP on an Interface CDP is enabled b y default on all suppo rted interfaces to send and recei ve CDP information.
23-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 23 Configuring CDP Monitoring and Maintaining CDP show cdp entry entry-name [ protocol | version ] Display information ab out a specif ic neighbor .
23-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 23 Configur ing CDP Monitoring and Maintaining CDP.
CH A P T E R 24-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 24 Configuring SPAN and RSPAN This chapter de scribes ho w to configur e Switched Port An alyzer (SP AN) and Remote SP AN (RSP AN) on your Catalyst 2950 or Catalyst 29 55.
24-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 24 Config uring SPAN and RSPAN Understanding SPAN and RSPAN Figur e 24-1 Example SP AN Configuration Only traf fic th at enters or lea ves sour ce p orts can be monitored b y using SP AN.
24-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 24 Configuring SPAN and RSPAN Understanding SPAN and RSPAN SPAN and RSPAN C oncepts and Terminology This section descri bes concepts and terminology associated with SP AN and RSP AN configuration.
24-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 24 Config uring SPAN and RSPAN Understanding SPAN and RSPAN Source Port A source port (also called a monitor ed port ) is a switched port that you monitor for network traf fic analysis.
24-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 24 Configuring SPAN and RSPAN Understanding SPAN and RSPAN Reflector Port The reflector port is the mechanism that copies packets onto an RSP AN VLAN.
24-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 24 Config uring SPAN and RSPAN Understanding SPAN and RSPAN • VLAN Trunking Protocol (VTP)— Y ou can use VTP to prune an RSP AN V LAN between switc hes.
24-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 24 Configuring SPAN and RSPAN Configuring SPAN Default SPAN and RSPAN Configuration Ta b l e 24-1 sho ws the defaul t SP AN and RSP AN conf iguration. Configuring SPAN This section describes ho w to configure SP AN on your switch .
24-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 24 Config uring SPAN and RSPAN Configuring SPAN – If you disable all sou rce ports or the destinat ion port, the SP AN function stops until both a source and the destination port are enabled.
24-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 24 Configuring SPAN and RSPAN Configuring SPAN Switch(config)# no monitor session 1 Switch(config)# monito.
24-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 24 Config uring SPAN and RSPAN Configuring SPAN This exampl e show s how to configu re the destination port for ing ress traf fic on VLAN 5 by using a security device that does not support IEEE 802.
24-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 24 Configuring SPAN and RSPAN Configuring RSPAN This exampl e show s how to disable recei ved traf fic mo.
24-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 24 Config uring SPAN and RSPAN Configuring RSPAN – All participatin g switches support RSP AN. Note The RSP AN VL AN cannot be VLAN 1 (t he default VLAN) or VLAN IDs 1002 through 1005 (reserv ed to T oken Ring and FDDI V LANs).
24-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 24 Configuring SPAN and RSPAN Configuring RSPAN Creating an RSPAN Source Session Beginni ng in pri vilege.
24-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 24 Config uring SPAN and RSPAN Configuring RSPAN This exampl e sho ws how to clear any e xisting RSP AN c.
24-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 24 Configuring SPAN and RSPAN Configuring RSPAN Removing Ports from an RSPAN Session Beginning in priv il.
24-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 24 Config uring SPAN and RSPAN Displaying SPAN and RSPAN Status Displaying SPAN and RSPAN Status T o display the status of the curren t SP AN or RSP AN conf iguration, use the show monitor pri vileged EXEC command.
CH A P T E R 25-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 25 Configuring RMON This chapter describes ho w to configur e Remote Network Monit oring (RMON) on your Catal yst 2950 or Catalyst 2955 switch.
25-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 25 Configuring RMON Configuring RMON Figur e 25-1 Remote Monit oring Example The switch supports these RMO.
25-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 25 Configuring RMON Configuring RMO N Default RMON Configuration RMON is disabled by def a ult; no al arms or e vents are conf igured. Only RMON 1 is supported on the swit ch.
25-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 25 Configuring RMON Configuring RMON T o disable an a larm, use the no rmon alarm number global conf iguration command on each alarm you confi gured. Y ou cannot disable at once all the alarms that you conf igured.
25-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 25 Configuring RMON Configuring RMO N Beginni ng in pri vileged EXEC mod e, follo w these steps to collect.
25-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 25 Configuring RMON Displaying RMON Status T o disable the collection of grou p Ethernet statistics, use the no rmon c ollection stats inde x inte rface confi guration command.
CH A P T E R 26-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 26 Configuring System Message Logging This chapter describes ho w to configure syst em message logging on your Catalyst 2950 or Catalyst 2955 switch.
26-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 26 Config ur ing System Message Logging Configuring System Messa ge Logging Configuring System Message Log.
26-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 26 Configuring System Messag e Logging Configuring System Messa ge Logging This example sho ws a partial s.
26-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 26 Config ur ing System Message Logging Configuring System Messa ge Logging Disabling the loggi ng process can slo w dow n the switch because a process mu st wait until t he messages are written to the console before co ntinuing.
26-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 26 Configuring System Messag e Logging Configuring System Messa ge Logging The logging buffer ed global conf iguration command copies logg ing messages to an internal b uffer .
26-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 26 Config ur ing System Message Logging Configuring System Messa ge Logging Beginni ng in pri vileged EXEC.
26-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 26 Configuring System Messag e Logging Configuring System Messa ge Logging T o disable timestamps for both deb ug and log messages, use the no ser vice timestamps global confi guration command.
26-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 26 Config ur ing System Message Logging Configuring System Messa ge Logging Defining the Message Severity .
26-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 26 Configuring System Messag e Logging Configuring System Messa ge Logging The software generates four other cat egories of messages: • Error messages about software or hardware malfunctions that appear at le vels war nings through emergencies .
26-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 26 Config ur ing System Message Logging Configuring System Messa ge Logging When the history table is ful.
26-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 26 Configuring System Messag e Logging Configuring System Messa ge Logging Configuring the UNIX System Lo.
26-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 26 Config ur ing System Message Logging Displaying the Logging Configuration Displaying the Logging Configuration T o display the logging conf iguration and the contents of the log buf fer , use the show logging privile ged EXEC command.
CH A P T E R 27-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 27 Configuring SNMP This chapter describe s ho w to configure the Simpl e Network Management Protoc ol (SNMP) on your Catalyst 29 50 or Catalyst 2955 switch.
27-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 27 Configu ring SNMP Understandi ng SNMP • Using SNMP to Access MIB V ariables, pa ge 27-4 • SNMP Noti.
27-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 27 Configuring SNMP Understanding SN MP Y ou must configure the SNMP agent t o use the SNMP version su pported by the manag ement station.
27-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 27 Configu ring SNMP Understandi ng SNMP The SNMP agent also sends unsolicited trap messages to notify an NMS that a signif icant event has occurred on the agent.
27-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 27 Configuring SNMP Configuring SNMP SNMP Notifications SNMP allows the switch to send notifications to S N MP managers when particular ev ents occur . SNMP notifications can be sen t as traps or inform req uests.
27-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 27 Configu ring SNMP Configuring SNMP SNMP Configuration Guidelines If the switch starts and th e switch st artup conf iguration ha s at least one snmp-server global configuration command, the SNMP agent is enabled.
27-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 27 Configuring SNMP Configuring SNMP • Changing the v a lue of the SNMP engine ID has important side ef fects.
27-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 27 Configu ring SNMP Configuring SNMP Beginni ng in pri v ile ged EXEC mode, follo w these st eps to confi.
27-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 27 Configuring SNMP Configuring SNMP T o remove a specific commu nity string, use the no snmp-server community string global configuration command.
27-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 27 Configu ring SNMP Configuring SNMP Step 3 snmp-s erv er group gr oupname { v1 | v2c | v3 { auth | noau.
27-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 27 Configuring SNMP Configuring SNMP Configuring SNMP Notifications A trap manager is a management station that recei ves and processes traps. T rap s are system alerts that the switch generates when certain e vents occur .
27-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 27 Configu ring SNMP Configuring SNMP Y o u can use the snmp-server host global conf iguration command to a specif ic hos t to recei ve the notif ication types listed in Ta b l e 27 -4 .
27-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 27 Configuring SNMP Configuring SNMP Step 3 snmp-server user username gr oupname { remote host [ udp-port.
27-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 27 Configu ring SNMP Configuring SNMP The snmp-server host command specif ies which hosts receive the notif ications. The sn mp-server enable trap command globally enables the mechanism for the specif ied notif ication (for traps and informs).
27-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 27 Configuring SNMP Configuring SNMP Limiting TFTP Servers Used Through SNMP Beginning in pri vileged EXE.
27-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 27 Configu ring SNMP Displaying SNMP Status This example sho ws how to allo w read-only acces s for all objects to members of access list 4 that use the comacces s community strin g.
CH A P T E R 28-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 28 Configuring Network Security with ACLs This chapter describes h ow t o conf igure network securi t.
28-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Understanding ACLs Understanding ACLs Packet f iltering can limit ne twork traf fic and restrict network use by certain users or devices.
28-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Understanding ACLs A CLs permit or deny packet forwarding based on ho w the packet matches the entries i n the A CL.
28-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Understanding ACLs Note In the first and second A CE s in the e.
28-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Understanding ACLs – UDP (Y ou can specify a UDP source, destination port number , or both at the same time.
28-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Configuring ACLs – Fast Ethernet ports support up to 75 A CEs per 1 A CL across a range of 8 Fast Eth ernet ports.
28-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Configuring ACLs Unsupported Features The switch does not suppo.
28-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Configuring ACLs Note In addition to num bered standard and e xtended A CLs , you can also create named standard and extended IP A CLs by using the supported numbers.
28-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Configuring ACLs Beginning in pri vileged EXEC mode, follow these steps to create a numbered standard IP A CL: Use the no access-list access-list-number global conf iguration command to delete th e entire A CL.
28-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Configuring ACLs Creating a Numbered Extended ACL Although sta.
28-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Configuring ACLs Note For information about creating A CLs to apply to management interfaces, see th e “Configuri ng IP Services” section of Cisco IOS IP and IP Routing Conf igurati on Guide, Release 12.
28-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Configuring ACLs Use the no access-list access-list-number global configuration command to delete the entire access list.
28-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Configuring ACLs Creating Named Standard and Extended ACLs Y ou can identify IP A CLs with an alphanumeric string (a name) rather than a n umber .
28-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Configuring ACLs When making the standard and ext ended A CL, .
28-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Configuring ACLs • Y ou can control logging messages. A CL entries can log traf fic at certain times of the d ay , bu t not constantly .
28-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Configuring ACLs time-range entry: new_year_day_2000 (inactive.
28-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Configuring ACLs Switch(config)# access-list 1 permit 171.69.2.88 Switch(config)# access-list 1 remark Do not allow Smith workstation through Switch(config)# access-list 1 deny 171.
28-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Configuring ACLs This example sh ows ho w to create and display an access list named ma c1 , denying o nly EtherT ype DECnet Phase IV traff ic, but per mitting all oth er types of traf fic.
28-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Applying ACLs to Terminal Lines or Physic al Interfaces Applyi.
28-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Displaying ACL Information Applying ACLs to a Physical Interfa.
28-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Displaying ACL Information Beginning in pri vileged EXEC mode,.
28-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Examples for Co mpiling ACLs Address determined by setup comma.
28-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Examples for Compiling ACLs Figur e 28-2 Using Switch ACLs t o Contr ol T raf fic This example uses a standard A C L to allow access to a specific Internet host with the address 172.
28-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Examples for Co mpiling ACLs Numbered ACL Examples This example sho ws that the switch accepts addresses on network 36.
28-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 28 Configuri ng Network Security with ACLs Examples for Compiling ACLs Switch(config)# access-list 100 deny host 171.
28-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 28 Configurin g Network Security with ACLs Examples for Co mpiling ACLs.
CH A P T E R 29-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 29 Configuring QoS This chapter describe s ho w to configure quality of serv ice (QoS) by using automatic-QoS (auto-Q oS) commands or by using standard QoS commands.
29-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Understandi ng QoS Y ou can also use these wizards to conf igure QoS only if your swit ch is running the EI: • Priority data wizard—Lets you assign priori ty lev els to data application s based on their TCP or UDP ports.
29-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Understanding Qo S Layer 3 IP pack ets can carry a Dif ferentiated Serv ices Code Point (DSCP) v alue. The supported DSCP v alues are 0, 8, 10, 16, 18, 24, 26, 32, 34, 40, 46, 48, and 56.
29-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Understandi ng QoS • Marking e valuates the policer and conf iguration informat ion f.
29-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Understanding Qo S The trust DSCP conf iguration is meanin gless for non-IP traf fic.
29-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Understandi ng QoS Classification Based on Cl ass Maps and Policy Maps A class map is a mechanism that y ou use to isolate and name a specif ic traff ic flow (or class) from all other traf fic.
29-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Understanding Qo S • Only one policer can be applied to a pack et in the input direct ion. • Only the av erage rate and committed burst p arameters are configurable.
29-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Understandi ng QoS Port Priority Frames receiv ed from use rs in the administrati vel y defined VLANs are classified or tagged for transmission to other de vices.
29-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Auto-QoS Y o u can enable the egress expedite queue and assi gn WRR weights to the other queues b y using the wrr -queue bandwidth weight1 weight 2 weight3 0 global conf iguration command.
29-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Auto-QoS Ta b l e 29-3 lists the generated au to-QoS conf iguration for the egress queues.
29-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Auto-QoS Effects of Auto-QoS on the Configuration When auto-QoS is enabled, the auto qos voip interface conf iguration command and t he generated confi guration are added to the running conf iguration.
29-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Auto-QoS Configuration Guidelines Before conf iguring auto-QoS, you sh ould be aw are of this informati on: • In releases earlier than Cisco IOS R elease 12.
29-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Auto-QoS Enabling Auto-QoS for VoIP Beginning in pri vileged EXEC mode, fo.
29-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Displaying Auto-QoS Information Switch(config)# interface gigabitethernet0/1 Switch(co.
29-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Auto-QoS Configuration E xample Figur e 29-3 A uto-QoS Configur at ion Example Networ k The intelligent wiring clo sets in Figure 29-3 are composed of Catalyst 2950 switches running the EI and Catalyst 3550 switches.
29-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS Beginni ng in priv ileged EXEC mode, follo w these steps to .
29-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S Note If your switch is running the SI, y ou can confi gure o.
29-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS • Y ou must disable the IEEE 802.3x flo wcontrol on all ports befo re enabling QoS on the switch. T o disable it, use the flowcontrol r eceive off and flowcontr ol send off interface conf iguration commands.
29-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S Configuring Classification Using Port Trust States This sect.
29-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS T o return a port to its untrusted st ate, use the no mls qos trust interf ace configuration command.
29-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S T o return to the default setting, use t he no mls qos cos { default-cos | ov erride } interface conf iguration command.
29-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS trusted boundary feature di sables the trusted setting on the swi tch port and pre vents misuse of a high-priority queue.
29-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S Enabling Pass-Through Mode In software releases ear lier th an Cisco IOS Release 12.1(11)EA1, the switch is in pass-thr ough mode.
29-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS Configuring a QoS Policy Note This feature is a v ailable only if your swit ch is running the EI.
29-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S For more inf ormation about creating I P standard A CLs, see the “Guidelines for Applying A CLs to Physical Interf aces” section on page 28-5 .
29-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS Beginning in priv ileged EXEC mode, foll ow these steps to create an IP exten ded A CL for IP traf fic: Command Purpose Step 1 configur e terminal Enter global conf iguration mode.
29-27 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S For more inf ormation about creating I P extended A CLs, see the “Guidelines for Apply ing A CLs to Physical Interf aces” section on page 28-5 .
29-28 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS This example sho ws how to create a Layer 2 MA C A C L with a permit statement. The statement allo ws traf fic from the host with MA C address 0001.
29-29 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S T o delete an existing class map, use the no class-map class-map-name global co nfiguration command.
29-30 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS Beginni ng in pri vileged EXEC mode, follow these steps to create a polic y map: Command Purpose Step 1 configur e terminal Enter global conf iguration mode.
29-31 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S T o delete an existing polic y map, use the no policy-map policy-map-name global configuration command. T o delete an existin g class map, use the no class class-map-name poli cy-map co nfigu ration command.
29-32 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS Switch(config)# access-list 1 permit 10.
29-33 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S If these v alues are not appropriate for your network, you need to modify them.
29-34 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standa rd QoS If these v alues are not appropriate for your network, you need to modify them.
29-35 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Configuring Standard Qo S Configuring the Egress Queues Note This feature is supported b y both the SI and EI.
29-36 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Displaying Stan dard QoS Information T o disable the WRR scheduling and enable the strict priorit y scheduling, use the no wrr -queue bandwidth global conf iguration command.
29-37 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Standard QoS Co nfiguration Examples Standard QoS Configuration Examples Note These examples are applicable only if your switch is runni ng the EI.
29-38 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Standard Q oS Configuration Examp les Figur e 29-5 QoS Configuration Example Networ k .
29-39 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Standard QoS Co nfiguration Examples For the Catalyst 29 00 and 3500 XL switches, CoS .
29-40 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 29 Configuring QoS Standard Q oS Configuration Examp les Step 18 show class-map videoclass show policy-map v ideopolicy show mls qos maps [ cos-dscp | dscp-cos ] V erify your entries.
CH A P T E R 30-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 30 Configuring EtherChannels This chapter descri bes how to conf igure EtherChan nel on the Layer 2 interfaces of a Catalyst 2950 or Catalyst 29 55 switch.
30-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 30 Config uring EtherChannels Understanding EtherChannels Figur e 30-1 T ypica l EtherChannel Configuration Each EtherChannel can consist of up to eight compat i bly conf igured Ethernet int erfaces.
30-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 30 Configuring EtherCh annels Understanding EtherCh annels Understanding Port-Channel Interfaces When you create an EtherChannel for Layer 2 interfa ces, a log ical interface is dynamically created, as sho wn in Figu re 30-2 .
30-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 30 Config uring EtherChannels Understanding EtherChannels PAgP and LACP Modes Ta b l e 30-1 shows th e user -config urable EtherChannel modes for th e channel-gr oup interface configuration command.
30-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 30 Configuring EtherCh annels Understanding EtherCh annels Exchanging LACP Packets Both the active and pas.
30-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 30 Config uring EtherChannels Understanding EtherChannels EtherChannel On Mode EtherCha nnel on mode can be used to manually configur e an EtherChannel. The on mode forces a port to join an EtherChannel without negotiations.
30-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 30 Configuring EtherCh annels Configuring EtherChann els Figur e 30-3 Load Distr ibution and F orwar ding Methods Use the option that provides the greatest variety in your conf iguration.
30- 8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 30 Config uring EtherChannels Configuring Et herChannels Default EtherChannel Configuration Ta b l e 30-2 shows the default EtherChannel configuration.
30-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 30 Configuring EtherCh annels Configuring EtherChann els • An EtherChannel supports the same al lo wed rang e of VLANs on all the int erfaces in a trunking Layer 2 EtherChannel.
30-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 30 Config uring EtherChannels Configuring Et herChannels Step 4 channel-group c hannel-gr oup-number mode.
30-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 30 Configuring EtherCh annels Configuring EtherChann els T o remove a po rt from the EtherChannel gro up, use the no channel-gr oup interface configuration command.
30-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 30 Config uring EtherChannels Configuring Et herChannels T o return EtherChannel load balancing t o the default con figurat ion, use the no port-channel load-balance global conf iguration command.
30-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 30 Configuring EtherCh annels Configuring EtherChann els Configuring Hot Standby Ports When enabled, LA CP tries to configure the maximu m num ber of LA CP-compatible ports in a channel, up to a maximum of 16 po rts.
30-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 30 Config uring EtherChannels Displaying Ether Channel, PAgP, and LACP Status Displaying EtherChannel, PA.
CH A P T E R 31-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 31 Troubleshooting This chapter describes ho w to identify and resolve Catalyst 2950 and Catal yst 2955 software probl ems related to the Cisco IOS softw a re.
31-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using Recover y Procedures Recovering from a Software Failure Switch software can be corrupted during an upgrad e, by do wnloading the wrong f ile to the switch, and by deleting th e image file.
31-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Using Recovery Procedure s flash_init load_helper boot Step 5 Initialize the flash f i.
31-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using Recover y Procedures Step 16 Return to pri vileged EXEC mode: switch(config)# ex.
31-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Using Recovery Procedure s Password Recovery with Password Recovery Enabled If the password-recov ery mechanism is enabled, this message appears: The system has been interrupted prior to initializing the flash file system.
31-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using Recover y Procedures Step 11 Change the password: Switch (config)# enable secret.
31-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Using Recovery Procedure s Step 2 Load any helper files: Switch: load_helper Step 3 Display the contents of flash memory: switch: dir flash: The switch file system appears in the directory .
31-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using Recover y Procedures Note The break key character is dif fer ent for each operating system. On a SUN work statio n running UNIX, Ctrl-C i s the break ke y .
31-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Using Recovery Procedure s Step 8 Display the contents of flash memory as in thi s example: switch# dir flash: Directory of flash:/ The switch file system appears in the directory .
31-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using Recover y Procedures Recovering from a Command Switch Failure This section describes ho w to recov er from a failed command switch.
31-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Using Recovery Procedure s Step 8 Return to pri vileged EXEC mode. Switch(config)# end Switch# Step 9 Use the manufa cturing defau lt confi guration, or set up th e switch through the man agement module.
31-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using Recover y Procedures Replacing a Failed Command Sw itch with Another Switch T o.
31-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Preventing Auto nego tiation Mismatches Step 10 When prompted for the enable secr e t and enable passwo rds, enter the passwords of the failed comm and switch again.
31-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting GBIC and SFP Module Security and Identification Note If a remote de vice does not autone gotiate, conf igure the duplex settings on the tw o ports to match.
31-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Diagnosing Connec tivity Problems • Destination unreachable—If the default gate wa y cannot reac h the sp ecified network, a destination-unr each able message is returned.
31-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Diagnosing Co nnectivity Problems Using Layer 2 Traceroute This section descri bes th.
31-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Diagnosing LR E Connection Problems – If an ARP entry e xists for th e specified IP addr ess, the switch uses th e associated MA C address and identifies the ph ysical path.
31-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using De bug Commands Using Debug Commands This section e xplains how you use the deb ug commands to diagnose and resolv e internetworking problems.
31-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Using Debug Command s Caution Because debugg ing output is assigned high prio rity in the CPU process, it can render the syst em unusable.
31-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using De bug Commands The no debug all p rivile ged EXEC command disables all diagnostic output. Usi ng the no debug all command is a con venient way to en sure that you ha ve no t accidentally left any debug commands enabled.
31-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Chapter 31 Troub leshooting Using the show controlle rs Commands For more inf ormation about auto-QoS , see the “Conf iguring Auto-QoS” section o n page 29-9 .
31-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Chapter 31 Troublesho oting Using the cr ashinfo File The information in the f ile includes the software imag e name and v ersion that failed , a dump of the processor registers, and a stack trace.
A-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 APPENDIX A Supported MIBs This appendix lists t he supported MIBs for this release.
A-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix A Supported MIBs MIB List • CISCO-P AE-MIB • CISCO-P A GP-MIB • CISCO-PING-MIB • CISCO-POR T -SECU.
A-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix A Supported MIBs Using FTP to Access the MIB Files Note The IF-MIB and the CISCO-IETF-VDSL-LINE-MIB ar e supported as read-only MI Bs for the Fast Ethernet interfaces on the CPE devices.
A-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix A Supported MIBs Using FTP to A ccess the MIB Files.
B-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 APPENDIX B Working with the Cisco IOS File System, Configuration Files, and Software Images This appendix describe.
B-2 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Working with the Flas.
B-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with the Flas.
B-4 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Working with the Flas.
B-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with the Flash File Syste m Local writable f ile systems include flash:.
B-6 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Working with the Flas.
B-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Configur.
B-8 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Working with Configuration Files • T o use the confi guration f ile for another switch.
B-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Configur.
B-10 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Working with Configu.
B-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Configura tion Files This example sho ws how to conf igure the software from t he file tok yo-confg at IP address 172.
B-12 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Working with Configuration Files The username and password must be associat ed with an account on the FTP server .
B-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Configu.
B-14 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Working with Configu.
B-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Configura tion Files • The username set by the ip rcmd r emote-username username global conf iguration command if the command is conf igured.
B-16 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Working with Configu.
B-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Configu.
B-18 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Workin g with S oftware Images Caution Y ou cannot restore the startup conf iguration file after i t has been deleted.
B-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Software Images Y o u can use the s how ve rsio n pri vileged EXEC command to see the software v ersion that is currently running on your swit ch.
B-20 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Workin g with S oftw.
B-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Software Images Downloading an Image File By Using TFTP Y o u can do wnload a new image f ile and repla ce the current image or keep the current image.
B-22 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Workin g with S oftware Images If you specify the /lea ve-old-sw , the existing f iles are not remo ved.
B-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Software Images Y o u do w nload a switch image file from a server to upgrade the switch software.
B-24 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Workin g with S oftware Images username global configuration command. This ne w name will be used during all archive operations.
B-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Softwar.
B-26 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Workin g with S oftw.
B-27 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Softwar.
B-28 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Workin g with S oftware Images If the switch IP address translates to Switch 1.
B-29 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Softwar.
B-30 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Workin g with S oftware Images The algorithm instal ls the do wnload ed image onto the system board flas h de vice (flash:).
B-31 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 Appendix B Working with the Cisco IOS F ile System, Configuration Files, and Software Images Working with Softwar.
B-32 Catalyst 2950 and Catalyst 2955 Sw itch Software Configuration Guide OL-10101-02 Appendix B Workin g with the Cisco IOS File System, Configuration Files, and Software Imag es Workin g with S oftw.
IN-1 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 INDEX Numerics 802.1Q and trunk po rts 10-2 encapsulation 16-14 802.
Index IN-2 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 ACLs (continued) IP creating 28-7 implicit deny 28-9, 28-12, 28-14 implicit masks 28-9 management interfaces.
Index IN-3 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 authentication (continued) RADIUS defined 8-17 key 8-21 login 8-23 TACACS+ defined 8-11 key 8-13 login 8-14.
Index IN-4 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 BPDU guard (continued) support for 1-5 broadcast storm control See storm control C cables, monitoring for un.
Index IN-5 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 CiscoWorks 2000 1-10, 27-4 class maps for QoS configuring 29-28 described 29-6 displayin g 29-36 class of s.
Index IN-6 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 command switch accessing 6-10 active (AC) 6-9 configuration conflicts 31-13 defined 6-2 passive (PC) 6-9 pas.
Index IN-7 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 configuring (continued) or an LRE upgrade 12-23 LRE ports 12-8 speed on Cisco 575 LRE CPE 12-11 Configuring.
Index IN-8 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 default configuration (continued) MSTP 14-11 MVR 20-17 NTP 7-4 optional span ning-tree features 15-13 passwo.
Index IN-9 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 DHCP snooping (continued) option 82 da ta insertion 19-3 trusted interfac e 19-2 untrusted interface 19-2 u.
Index IN-10 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 egress port scheduling 29-8 enable password 8-4 enable secret password 8-4 encapsulation 29-8 encryption fo.
Index IN-11 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 files (continued) tar creating B-5 displaying t he contents of B-6 extracting B-7 image file fo rmat B-19 .
Index IN-12 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 HSRP automatic cluster recovery 6-11 cluster standby group consi derations 6-10 See also clusters, cluster standby group, and standby command switch I ICMP ping executing 31-15 overview 31-14 IE2100 described 1-9 support for 1-4 IEEE 802.
Index IN-13 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 interfaces (continued) configuring 10-5 configuring dupl ex mode 10-10 configuring speed 10-10 counters, c.
Index IN-14 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 L LACP See EtherChannel Layer 2 frames, classification with CoS 29-2 Layer 2 interfaces, default configu ra.
Index IN-15 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 LRE ports (continued) rate selection described 12-14 sequence s 12-5 troubleshooting 31-17 LRE profiles as.
Index IN-16 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 member switch automatic discovery 6-5 defined 6-2 passwords 6-12 recovering from lost connectivity 31-13 re.
Index IN-17 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 MSTP (continued) extended system ID effects on root switch 14-14 effects on secondary root switch 14-15 un.
Index IN-18 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 Network Assistant (continued) described 1-9 guide mode 1-3 management options 1-2 wizards 1-3 network examp.
Index IN-19 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 passwords (continued) setting enable 8-3 enable secret 8-4 Telnet 8-6 with usernames 8-7 VTP domain 17-8 p.
Index IN-20 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 port-based authentication (continued) initiation and message exchange 9-3 magic pack et 9-11 method lists 9.
Index IN-21 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 private VL AN edge ports See protected ports privileged EXEC mode 2-2 privilege levels changing the defaul.
Index IN-22 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 QoS (continued) configuring auto-QoS 29-9 class maps 29-28 CoS and WRR 29-35 default port CoS v alue 29-20 .
Index IN-23 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 RADIUS (continued) identifying the server 8-20 in cluste rs 6-13 limiting the servi ces to the user 8-27 m.
Index IN-24 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 RFC (continued) 2236, IP mult icast and IGMP 20-2 2273-2275, SNMP v3 27-2 RMON default configu ration 25-3 .
Index IN-25 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 servers, BOOTP 1-4 service-provider netw ork, MSTP and RSTP 14-1 set-request operat ion 27-4 settings dupl.
Index IN-26 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 SNMP (continued) users 27-9 versions supported 27-2 snooping, IGMP 20-1 SNR definition of 12-16 downstream .
Index IN-27 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 statistics (continued) IEEE 802.1x 9-28 interface 10-16 QoS ingress and egress 29-37 RMON group Ethe rnet .
Index IN-28 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 STP (continued) interface states blocking 13-5 disabled 13-6 forwarding 13-5, 13-6 learning 13-6 listening 13-6 overview 13-4 interoperability and comp atibility among modes 13-10 limitations with IEEE 802.
Index IN-29 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 system message logging (continued) enabling 26-3 facility keywords, described 26-11 level keywords, descri.
Index IN-30 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 traceroute, Layer 2 and ARP 31-16 and CDP 31-16 described 31-16 IP addresses and subnets 31-16 MAC addresse.
Index IN-31 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 UniDirectional Link Detection protocol See UDLD UNIX syslog servers daemon configuration 26-10 facilities .
Index IN-32 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02 VLANs (continued) creating in VLAN configuration mod e 16-9 default configu ration 16-7 deletin g 16-9 desc.
Index IN-33 Catalyst 2950 and Catalyst 2955 Swit ch Software Con figuration Guide OL-10101-02 VTP (continued) disabling 17-12 domain names 17-8 domains 17-2 modes client 17-3, 17-11 server 17-2, 17-9 .
Index IN-34 Catalyst 2950 and Catalyst 2955 Swit ch Software Configuration Guide OL-10101-02.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Cisco Systems 2955 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Cisco Systems 2955 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Cisco Systems 2955 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Cisco Systems 2955 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Cisco Systems 2955, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Cisco Systems 2955.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Cisco Systems 2955. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Cisco Systems 2955 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
