Manuale d’uso / di manutenzione del prodotto 28XX del fabbricante Dell
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www .dell.com | support.dell.com Dell™ PowerConnect™ 28xx Systems User Guide.
Notes, Notices, and Cautions NOTE: A NOTE indicates important info rmation that helps you make better use of your computer . NOTICE: A NOTICE in dicates either potential dama ge to hardware or loss of data and tells you how to avoid the problem. CAUTION: A CAUTION indicates a potential for pro perty damage, personal injury , or death.
3 Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PowerConnect 2808 . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PowerConnect 2816 .
4 Power Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Internal Power Supply Connector . . . . . . . . . . . . . . . . . . . . 26 3 Installing the PowerConnect Device . . . . . . . . . . . . . . 27 Installation Prec autions .
5 Initial Configuration Through the W eb . . . . . . . . . . . . . . . . . . . . 48 Basic Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Retrieving an IP Address From a DHCP Server . . . . . . . . . . . . . 49 Star tup Menu . .
6 Defining SNMP Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Defining SNMP Global Parameters . . . . . . . . . . . . . . . . . . . 74 Defining Communities . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Defining SNMP Noti fication Reci pients .
7 Configuring VLANs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 Defining VLAN Members . . . . . . . . . . . . . . . . . . . . . . . 124 VLAN Port Membership T able . . . . . . . . . . . . . . . . . . . . 126 Defining VLAN Ports Settings .
8 Using the CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 Command Mode Overview . . . . . . . . . . . . . . . . . . . . . . 154 User EXEC Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 154 Privileged EXEC Mode . .
Dell PowerConnect 28xx Systems User Guide 9 1 Introduction This User ’s Guide contains the information needed f or installing , configuring and maint aining the P o werConnect 2808, P owerConnect 2816, P owe rConnect 2 824, and P owerCon nect 2848 W eb- managed Gigabit Ethernet switches.
10 Dell PowerConnect 28xx Systems User Guide Figure 1-2. PowerConnect 2816 Front Panel The P o werConnect 2816 supports the following ports: • 16 Gigabit Ethernet copper ports PowerConnect 2824 The following figur e illustrates th e P owerConnect 2 824 front panel.
Dell PowerConnect 28xx Systems User Guide 11 Summary of PowerCon nect Models The following table summarizes the P owerConnect models. Features General Features Management Modes The device supports the following modes: • Managed Mode — P rovides switch management through the web interface.
12 Dell PowerConnect 28xx Systems User Guide Auto Negotiation Aut o negotiation allo ws an Ethernet switch to ad vertise modes of operatio n. The auto negotiation function provides the means to ex cha.
Dell PowerConnect 28xx Systems User Guide 13 MAC Address Supported Features MAC Address Capacity Support The P owerConnect 2808, 2816, 2824 switch es support a total of 8K MAC addr esses , and the P owerConnect 2848 supports a total of 16K MAC addresses.
14 Dell PowerConnect 28xx Systems User Guide • Short-Reach — Reduction of power over Ether net cables shorter than 40m. IGMP Snooping Internet Group Membership P rotocol (IGMP) Snooping e xamines IGMP frame contents, when they ar e forwarded by the device fr om work st ations to an upstream Multicast router .
Dell PowerConnect 28xx Systems User Guide 15 • Higher bandwidth connections • Improved bandwidth granularity • High bandwidth server connectivity A LAG is compo sed of ports wi th the same s peed set to full-du plex operation.
16 Dell PowerConnect 28xx Systems User Guide Class of Service (CoS) Featur es The P o werConnect 28xx system enables users to define various services fo r traffic classes of service. The underlying mechanism for supporting bandwidth man agement and control is based on the use of multiple priority queues for classifying traffi c.
Dell PowerConnect 28xx Systems User Guide 17 2 Hardware Description Switch Port Configurations PowerConnect 28x x Front and Back Panel Port Desc ription The Dell™ P o werConnect™ 28xx switches use 10/ 100/1000BASE- T ports on the front panel for connecting to a network.
18 Dell PowerConnect 28xx Systems User Guide Figure 2-2. PowerConnect 2808 Back Panel Figure 2-3. PowerConnect 2816 Front Panel On the front panel there ar e 16 ports which are number ed 1 to 16, top down and left to right. On each port there ar e LEDs to indicate the port status.
Dell PowerConnect 28xx Systems User Guide 19 Figure 2-5. PowerConnect 2824 Front Panel On the front panel there ar e 24 ports which are number ed 1 to 24, top down and left to right.
20 Dell PowerConnect 28xx Systems User Guide Figure 2-6. PowerConnect 2824 Back Panel Figure 2-7. PowerConnect 2848 Front Panel On the front panel there ar e 48 ports, which are number ed 1 to 48, top down and left to right. On each port, there ar e LEDs to indicate the port status.
Dell PowerConnect 28xx Systems User Guide 21 button, located on the right side on the fr ont panel is used to tra nsition between management modes and to reset t he device. F or more information about management modes and transitioning between them, see "Management Mo des" on page 49.
22 Dell PowerConnect 28xx Systems User Guide Power LED On the P owerConnect 28xx front panel ther e is a P ower LED. The following table describes the P ower Supply status LED indications. Managed Mode LED On the P owerConnect 28xx front panel ther e is a Managed Mode LED moni tori ng the switch node as well as indicating diagnostic test results.
Dell PowerConnect 28xx Systems User Guide 23 Figure 2-9. RJ-45 Copper -bas ed 10/100/100 0BASE-T LEDs The RJ-45 LED indications are de scribed in the following table: SFP Port LED The following table describe s the SFP LED indications. Managed Mode Butt on The P owerConnect 28xx has a Mode push button on th e front panel.
24 Dell PowerConnect 28xx Systems User Guide Cables, Port Connections, and Pinout Information This section e xplains th e switch physical interfaces, and provides information about cables and port connections.
Dell PowerConnect 28xx Systems User Guide 25 SFP Ports The P owerConnect 2824 switch supports two SFP tra nsceivers combo ports, an d the P owerConnect 2848 switch supports four SFP transceivers combo ports for various fiber-based mo dules (1000BASE-SX or 1000BASE-LX).
26 Dell PowerConnect 28xx Systems User Guide Power Connectors The P owerConnect 28xx is power ed by using the AC internal power supply . Internal Power Supply Connector The P owerConnect 28xx supports a single internal power supply to provide power for switching operations.
Dell PowerConnect 28xx Systems User Guide 27 3 Installing the PowerConnect Device This section contains information about device unpacking, location, installation, and cable connections.
28 Dell PowerConnect 28xx Systems User Guide Site Requirements The P owerConnect 28xx can be mounted in a standa rd equipment rack, placed on a tabl etop, or mounted on the wall.
Dell PowerConnect 28xx Systems User Guide 29 5 Inspect the product for damage. Report any damage immediately . Mounting the Device Overview There are thr ee device mounting options : • Installing in.
30 Dell PowerConnect 28xx Systems User Guide Figure 3-1. Bracket Installation for Rack Mounting 2 Insert the supplied scre ws into the rack mo unting holes and tighten with a screwdriver . 3 Repeat the process for the rack-mounting bracket on the other side of the device.
Dell PowerConnect 28xx Systems User Guide 31 Installing on a W all T o mount the device on a wall: 1 Ensure that the mounting location meets the following requirements: • The surface of the wall must b e capable of supporting the device. • Allow at least 2 inches (5.
32 Dell PowerConnect 28xx Systems User Guide 6 On the wall mark the locations where the scre ws to hold the device must be prepar ed. 7 On the marked locations, drill the holes and place all plugs (not provided) in the holes. 8 Secure the device to the wall with screws (not pr ovided).
Dell PowerConnect 28xx Systems User Guide 33 Connecting the Device T o configur e the device, the device must be connected to a terminal. Connecting the Devi ce to the Network T o connect to an uplink port, use Category 5 Un shielded T wiste d-P air ( UTP) cables with RJ-45 connectors at both ends.
34 Dell PowerConnect 28xx Systems User Guide b Set the data rate to 9600 baud. c Set the data format to 8 data bi ts, 1 stop bit, and no parity . d Set flow control to none. e Under P rop erties, select VT100 for Emulation mode. f Select T erminal keys for F unction, Arrow , and Ctrl keys.
Dell PowerConnect 28xx Systems User Guide 35 Figure 3-4. Connecting to Power Supply 3 After connecting the device to a power source, confirm tha t the device is connecte d and operating correctly by e xamining the LEDs on the front panel.
36 Dell PowerConnect 28xx Systems User Guide T able 3-1. Ports, Connectors and Cables The RJ-45pin number allocation for the 10/100/1 000BaseT ports is listed in the table following. T able 3-2. RJ-45 Pin Number Allocati on for 10/100/1000B aseT Ethernet Port Connect or Port/Inter face C able RJ-45 10/100/1000BaseT P ort Cat.
Dell PowerConnect 28xx Systems User Guide 37 Port Default Settings The general information for configuring the device ports includes the short description of the auto- negotiation mechanism and the defaul t settings for switch ing ports.
38 Dell PowerConnect 28xx Systems User Guide Switching Port Default Settings The following table gives th e port defaul t settings . T able 3-3. Port Default Settings Function Default Setting P ort sp.
Dell PowerConnect 28xx Systems User Guide 39 4 43+ Starting and Configuring the Device After completing all e xternal conn ections, the device must be co nfigur ed. This section describes various methods of configuring the device. NOTE: The P owerConnect 2808 has an internal serial port.
40 Dell PowerConnect 28xx Systems User Guide Figure 4-1. Installation and Configuration Flow Management Modes The device can be run in Managed or Unmanaged mode . By default, the device is in Unmanaged mode. These modes are described below : • Managed Mode — In this mode: – Switch can be managed through the web interface.
Dell PowerConnect 28xx Systems User Guide 41 – The current running configuration is automatically sa ved to local storage. If the system is switched to unmanaged mode via the Managed Mode bu tton, the system does not load the saved configuration, but it is still maintain ed in the device’s local stora ge.
42 Dell PowerConnect 28xx Systems User Guide T ransitioning Between Modes F igure 4-5 shows the transition between Manage d, Secure and Unmanaged operating modes: Figure 4-2. T ransitioning Between Management Modes Note the following points: • The Managed Mode LED des ignates whether the manage ment interface is active on th e switch.
Dell PowerConnect 28xx Systems User Guide 43 • P ower cycle returns the switch to the same st ate that existed prior to the power cycle, and configuration is preserved.
44 Dell PowerConnect 28xx Systems User Guide – Use Saved IP/User Name/P assw ord — When restoring local configurat ion, this option uses the IP address, user name and password that were au tomatically saved when you exited Managed mode.
Dell PowerConnect 28xx Systems User Guide 45 • The PowerConnect device booted successfully . • The console connection is established and t he console prompt is displayed on the screen of a VT100 terminal device. (Press the <Enter> key severa l times to verify that the prompt displays correctly .
46 Dell PowerConnect 28xx Systems User Guide Wizard Step 1 The following information displays: The system is not setup for SNMP management by default. To manage the switch using SNMP (required for Del.
Dell PowerConnect 28xx Systems User Guide 47 Enter the user name<1-20>:[admin] Please enter the user password:***** Please reenter the user password:***** Wizard Step 3 The following information displays: Next, an IP address is set up. The IP address is defined on the default VLAN,(VLAN #2).
48 Dell PowerConnect 28xx Systems User Guide Wizard Step 4 The following information displays: Finally, setup the default gateway. Please enter the IP address of the gateway from which this network is reachable(e.g. 192.168.1.1).Default gateway (A.B.C.
Dell PowerConnect 28xx Systems User Guide 49 1 Connect the switch to a PC via Ethernet, and set a static IP address of 192.1 68.2.x 255.255.255.0 (where x is between 2 and 254) on the PC. 2 Connect to the switch using IP address 192.168.2.1 in your web browser .
50 Dell PowerConnect 28xx Systems User Guide Startup Menu The procedures called from the Startup menu cove r software download, flas h handling and password recovery . The diagnostics procedures are for use by technical support personnel only and are not disclo sed in the document.
Dell PowerConnect 28xx Systems User Guide 51 [4] Enter Diagnostic Mode [5] Set Terminal Baud-Rate [6] Back Enter your choice or press 'ESC' to exit The following sections describe th e available Startup menu options.
52 Dell PowerConnect 28xx Systems User Guide 3 Enter config as the name of the flash file. Th e configuration is erased an d the device reboots. 4 Repeat the device initial configuration. Password Recovery If a password is lost , the P asswor d Recovery proc edure can be called from the Startup menu .
Dell PowerConnect 28xx Systems User Guide 53 4 Enter the reload command. The following message is displayed: console# reload This command will reset the whole sy stem and disconnect your current session. Do you want to continue (y/ n) [n]? 5 Enter y .
Dell PowerConnect 28xx Systems User Guide 54 5 Using Dell OpenManage Switch Administrator This section prov ides an intro duction to the user interface.
Dell PowerConnect 28xx Systems User Guide 55 Using the Switch Administrator Buttons This section describes the buttons found on the OpenManage Switch Administrator interface. Information Buttons Information buttons provide access to on-line support and online help, as well as information ab out the OpenManage Switch Admi nistrator interfaces.
56 Dell PowerConnect 28xx Systems User Guide Device Manageme nt Buttons Device Management buttons provide an easy method of configuring device inform ation, and includes the following: Starting the Application 1 Open a web browser . 2 Enter the device’s IP address (as defined in the CLI) in the address bar and press <Enter>.
Dell PowerConnect 28xx Systems User Guide 57 • Management — This is a read-write mode where you ca n see and edit all pages of the interface. • Monitor — This is a read-only mode wh ere you can see a subset of the interface pages, but you cannot edit them.
Dell PowerConnect 28xx Systems User Guide 58 6 Configuring System Information This section provides in formation for defining system pa rameters including secu rity features, downloading device soft ware, and re setting the device. T o open the System page, click System in the tree view .
Dell PowerConnect 28xx Systems User Guide 59 Figure 6-2. Asset • System Name (0- Characters) — Defines the user -defined device name. • System Contact (0- Characters) — Specifies the name of the contact person. • System Location (0- Characters) — Specifies the location where th e system is curr ently running.
60 Dell PowerConnect 28xx Systems User Guide 3 Click Apply Changes . The system parameters are defined, and the device is updated. Initiating a T elnet Session: 1 Open the Asset page.
Dell PowerConnect 28xx Systems User Guide 61 Resetting the Device The Res et page enables the device to be r eset from a re mote location. F or more information about saved Configuration file s, see "Man aging F iles" on pa ge 79 . To o p e n t h e Re se t page , click System General Res e t in the tree view .
62 Dell PowerConnect 28xx Systems User Guide Entering Secure M ode The Secure Mode page allows you to put the device in the Secure management mode. Once enabled, it prevents users from making any furt her configuration changes to the sw itch. This is done by r emoving the IP address of the switch so that it becomes inaccessible.
Dell PowerConnect 28xx Systems User Guide 63 Defining Device IP Addresses The IP Addressing page contains a link to the IP Interface P arameters page that is used to assign the device IP address, subnet ma sk and default gateway , and fo r enabling or disabling DHCP .
64 Dell PowerConnect 28xx Systems User Guide Running Cable Diagnostics The Diagnostics section contains links to pa ges for performing virtual cable tests on copper cables and optical transceivers. T o open the Diagnostics page, click System Diagnostics in the tree view .
Dell PowerConnect 28xx Systems User Guide 65 • Cable F ault Distance — The distance from the port where the cable error occurred. • Last Update — The last time the port was tested. • Approximate Cable Length — The approximate cable length.
66 Dell PowerConnect 28xx Systems User Guide Figure 6-8. Optical T ransceiver Diagnostics The Optical T r ansceiver Diagnostics page contains th e following fie lds: • Po r t — The port to which the fiber cable is connected. • Te m p e r a t u r e — The tempe rature (in Celsius) at which the cable is operating.
Dell PowerConnect 28xx Systems User Guide 67 • Po r t — The port to which the fiber cable is connected. • Te m p e r a t u r e — Internally measured transceiver te mperature. • Vo l t a g e — Internally measured supply voltage. • Current — Measured TX bias curr ent.
68 Dell PowerConnect 28xx Systems User Guide Managing Device Security The Manageme nt Security page provides access to security pages that contain fields for setting security parameters for user data base, passwor d and RADIUS security . T o open the Manage ment Security page , click System Management Security in the tree view .
Dell PowerConnect 28xx Systems User Guide 69 4 Click Apply Changes . The user access rights and passwords are defined, and the d evice is updated. Defining a New User: 1 Open the Loc al Us er D at aba se page. 2 Click Add . The Add User page opens: Figure 6-10.
70 Dell PowerConnect 28xx Systems User Guide Deleting Users: 1 Open the Loc al Us er D at aba se page. 2 Click Show All. The Local User T able opens. 3 Select a User Name. 4 Select the Rem ov e check box. 5 Click Apply Changes . The selected user is deleted and the device is updated.
Dell PowerConnect 28xx Systems User Guide 71 • Authenti cation P ort — Identifies the authentication port. The authentication port is used to verify the RADIUS server authentication. • Number of Retries (1-10) — Specifies the number of transmitted requests sent to RADIUS server before a failure occurs.
72 Dell PowerConnect 28xx Systems User Guide Figure 6-13. Add RADIUS Server Page 3 Define the fields. 4 Click Apply Changes . The new RADIUS server is added, and the d evice is updated. Displaying the RADIUS Server List: 1 Open the R ADIUS Settings page.
Dell PowerConnect 28xx Systems User Guide 73 3 Modify the relevant field s. 4 Click Apply Changes . The R ADIUS Server settings are modified, and the device is updated. Deleting a RADIUS Server for the RADIUS Servers List: 1 Open the R ADIUS Settings page.
74 Dell PowerConnect 28xx Systems User Guide Defining SNMP Global Parameters The SNMP Global P arameters page permits enabling both SNMP and Authentication notifications.T o open the SNMP Global P arameters page, click System SN MP Global P arameters in the tree view .
Dell PowerConnect 28xx Systems User Guide 75 Defining Communities Access rights are managed by defining communities in the Community T able . When the community names are changed, access rights are also changed.T o open the SNMP Community page, click System SNMP Community in the tree view .
76 Dell PowerConnect 28xx Systems User Guide Figure 6-17. Add SNMP Community 3 Select one of the following: – SNMP Management Station — Defines an SNMP community for a specif ic management station. – All — Defines an SNMP community for all management stations.
Dell PowerConnect 28xx Systems User Guide 77 3 Select a community from the Community T able. 4 Select the Rem ov e check box. 5 Click Apply Changes . The selected community entry is de leted, and the device is upda ted.
78 Dell PowerConnect 28xx Systems User Guide Adding a new T r ap Recipients 1 Open Notification R ecipients page. 2 Click Add . The Add Notification Recipients page opens: 3 Define the relevant fields. 4 Click Apply Changes . The notifica tion recipient is a dded, and the device is updated.
Dell PowerConnect 28xx Systems User Guide 79 4 Check the Rem ov e checkbox. 5 Click Apply Changes . The recipient is deleted, and the device is updated. Managing Files The F ile Manageme nt section contains fields for managin g de vice software, the Image F iles, an d the Configuration F iles.
80 Dell PowerConnect 28xx Systems User Guide Figure 6-21. File Download From Server • Fi r m w a r e D o w n l o a d — The F irmware file is downloaded. If Fi r m w a r e D o w n l o a d is selected, the Configuration Download fields are grayed out.
Dell PowerConnect 28xx Systems User Guide 81 Configuration Download • Server IP Address — The Server IP Address from which the configuration files a re downloaded. • Source F ile Name — Indicates the configuration files to be downloaded. During the imag e file download, a dialog box opens which displays the download progress.
82 Dell PowerConnect 28xx Systems User Guide The F ile Upload to Server page contains the following fields: • Upload via TFTP — Enables initiating upload via the TFTP server . • Upload via HTTP — Enables initiating upload via the FT P server .
Dell PowerConnect 28xx Systems User Guide 83 Defining DHCP Server Settings The DHCP server is used mainly for centrali zed control over assignmen t of IP addresses to attached hosts. A switch can operate as either a DHCP client (obt aining its own IP from a DHCP server) as a DHCP server .
84 Dell PowerConnect 28xx Systems User Guide Figure 6-24. DHCP Server Properties • DHCP Server Status — Indicates if the DHCP server is en able d. The possible field values are: – Enable — Enables the DHCP server . – Disable — Disables the DHCP se rver .
Dell PowerConnect 28xx Systems User Guide 85 5 Define the amount of time (in milliseconds) the DHCP server waits for a ping reply in the DHCP Pin g Tim eo u t field, or click Use Default to select the default ti meout of 500 milliseconds. 6 Click Apply Changes .
86 Dell PowerConnect 28xx Systems User Guide – Days — Specifies the duration of the lease in number of days. The range is 0 to 49710 days. – Hours — Specifies the number of hours in the lease. A days value must be supplied before an hours value can be add ed.
Dell PowerConnect 28xx Systems User Guide 87 The Excluded Addresses page lists the excluded addresses. T o open the Excluded Addresses page, click System DHCP Server Excluded Addresses in th e tree view . Figure 6-26. Excluded Addresses • Start IP Address — Displays the first IP address in the range of excluded IP addresses.
88 Dell PowerConnect 28xx Systems User Guide 2 Check the Rem ov e checkbox next to an address. 3 Click Apply Changes . The addres s is deleted, and the device is updated. Manually Allocating IP Addresses (Static Hosts) The Static Hosts page is used to manually allocate IP addr esses to network hosts.
Dell PowerConnect 28xx Systems User Guide 89 • Domain Name Server — Specifies the DNS server available to the DHCP client. • Domain Name— Specifies • NetBIOS WI NS Ser ver — Specifies the NetBIOS WINS server av ailable to a Microsoft DHCP stat ic host.
90 Dell PowerConnect 28xx Systems User Guide Figure 6-29. Add Static Host 3 Define the relevant fields. 4 Click Apply Changes . The static host is added, and the device is updated. Displaying Static Hosts T ables 1 Open the Static Hosts page. 2 Click Show All .
Dell PowerConnect 28xx Systems User Guide 91 Deleting Static Hosts 1 Open the Static Hosts page. 2 Click Show All . The Static Hosts T able p age opens. 3 Check the Rem ov e checkbox next to a static host. 4 Click Apply Changes . The host is del eted, and the device is u pdated.
92 Dell PowerConnect 28xx Systems User Guide Defining Advanced Settings The Advanced Settings page contains information for config uring general settings. Use Advanced Settings to set miscellaneous global attributes for the device. The changes to these attributes are applied only after the device is reset.
Dell PowerConnect 28xx Systems User Guide 93 7 Configuring Device Switching This section provides all system operat ion and ge neral information for conf iguring netwo rk security , ports, Address tables, GARP , VLAN s, Spanning T ree, P ort Aggreg ation, and Multicast Support.
94 Dell PowerConnect 28xx Systems User Guide Advanced P ort Based Authenti cation is implemented in the following modes: • Single Host Mode — Enables only the author ized host for sin gle-session access to the p ort. • Multiple Host Mode — Enables multiple hosts to be attached to a single port, for single-session access.
Dell PowerConnect 28xx Systems User Guide 95 – None — No authentication method is used to authenticate the port. – RA D I U S — P ort authentication is performed using the RADIUS server . – RA D I U S , N o n e — P ort authentication is performed first using the RADIUS server .
96 Dell PowerConnect 28xx Systems User Guide Figure 7-2. Port Based Authentication T able T erminatio n Cause — The reason for which the port authentication was terminated. Copy T o Checkbox — Copies port parameters from one port to the selected ports.
Dell PowerConnect 28xx Systems User Guide 97 Configuring Advanced Po rt Based Authentication The Mult iple Hosts page provides information for defining adva nced port based authentication settings for specific ports. T o open the Multiple Hosts , click Switch Network Security Multiple Hosts .
98 Dell PowerConnect 28xx Systems User Guide • T rap F requency (1-100000 0) (Sec) — Defines the time period by which traps are sent to the host. The T rap F requency (1-1000000) field can b e defined only if th e Multiple Hosts field is defi ned as Disable .
Dell PowerConnect 28xx Systems User Guide 99 Authenticating Users The Authenticated Users page displays user port access lists. T o open the Authenticated Users page, click Switch Network Security Authent icated Users . Figure 7-5. Authenticated Users • User Name — List of users authoriz ed via the RADIUS Server .
100 Dell PowerConnect 28xx Systems User Guide Figure 7-6. Authenticated Users T able.
Dell PowerConnect 28xx Systems User Guide 101 Configuring Ports The Po r t s page contains links to port functionality pages including adva nced features, such as Gr een Ethernet, Storm Control and P ort Mirroring. T o open the Po r t s page, click Switch Po r t s .
102 Dell PowerConnect 28xx Systems User Guide – Active — The port is currently active and is cu rr ently receiving and transmitting traffic. – Disable — The port is currently disabled, and is no t currently r eceiving or transmitting traffic. • Admin Speed — The configured rate for the port.
Dell PowerConnect 28xx Systems User Guide 103 • LAG — Specifies if the port is part of a LAG. Defining Port Parameters 1 Open the Po r t C o n f i g u r a t i o n page. 2 Select a port in the Po r t Fi e l d . 3 Define the remaining fields. 4 Click Apply Changes .
104 Dell PowerConnect 28xx Systems User Guide LAGs can be configured accor ding to the following load balancing types: Layer 2, Layer 2 and Layer 3 or Layer 3. The LAG Co nfiguration page contains fields for configurin g paramete rs for co nfigured LAGs.
Dell PowerConnect 28xx Systems User Guide 105 • Description (0-64 Characters) — Provides a user -defined description of the configured LAG. • LAG T ype — The port types that comprise the LAG. • Admin Status — Enables or disabl es traffic forwarding through the selecte d LAG.
106 Dell PowerConnect 28xx Systems User Guide Displaying the LAG Configuration T able: 1 Open the LAG Con figuration page. 2 Click Show All. The LAG Configuration T ab le opens: Figure 7-10.
Dell PowerConnect 28xx Systems User Guide 107 Figure 7-11. Green Ethernet Configuration • Cumulative Energy Saved — The total amount of energy saved since the last reset. This amount is equal to the saved power multiplied by the time period in hours.
108 Dell PowerConnect 28xx Systems User Guide – Oper — Whether Energy-Detect is cu rr ently in force for the port. – Rea so n — If Admin indicates that Ener gy-Detect is enabled and Oper indicates it is not in force, this column gives the reason.
Dell PowerConnect 28xx Systems User Guide 109 Figure 7-12. Storm Control • Po r t — The port from which storm control is enabled. • Broadcast Control — Enables or disables forwarding br oadcast packet types on the device. • Mode — Specifies the Broadcast mode cu rrently enabled on the device.
110 Dell PowerConnect 28xx Systems User Guide Figure 7-13. Storm Control T able Defining Port Mirroring Sessions P ort mirroring monitors and mirrors network traff ic by forwarding co pie s of incoming and outg oing packets from one port to a monitoring port.
Dell PowerConnect 28xx Systems User Guide 111 The following restrictions apply to po rts configur ed to be source ports: • Source ports cannot be a LAG member . • Source ports cannot be configured as a de stination port. • All pack ets are transmitted tagged from the destination port.
112 Dell PowerConnect 28xx Systems User Guide 5 Define the Ty p e field. 6 Click Apply Changes . The new source po rt is defined, and th e device is upd ated. Deleting a Copy Port from a Port Mirroring Session 1 Open the P ort Mirroring page. 2 Select the Rem ov e check box.
Dell PowerConnect 28xx Systems User Guide 113 Figure 7-15. Dynamic Address T able • Address Aging (10-630) — Specifies the amount of time the MAC Address r emains in the Dynamic Address T able before it is timed out if no traffic from the source is detected.
114 Dell PowerConnect 28xx Systems User Guide Querying the Dynamic Address T able 1 Open the Dynamic Address T able . 2 Define the parameter by which to query the Dynamic Address T able . Entries can be queried b y Po r t , MAC Address , or VLAN ID . 3 Click Query .
Dell PowerConnect 28xx Systems User Guide 115 Figure 7-16. STP Global Settings • Spanning T ree State — Enables or disab les Spanning T ree on th e device. The possible field values are: – Enable — Enables Spanning T ree – Disable — Disables Spannin g T ree • STP Operation Mode — The STP mode by which STP is enabled on the device.
116 Dell PowerConnect 28xx Systems User Guide • P riority (0-61440 in steps of 4096) — Specifies the bridge priority va lue. When switches or bridges are running STP , each is assigned a priority . After ex ch anging BPDUs, the switch with the lowest priority value becomes the Root Bridge.
Dell PowerConnect 28xx Systems User Guide 117 Defining STP Port Settings The STP P ort Settings page contains fields for assigning ST P properties to indivi dual ports. T o open the STP P ort Settings page, click Switch Sp anning T ree P ort Settings in the tree view .
118 Dell PowerConnect 28xx Systems User Guide • Po r t S t a t e — The current port STP state. If enabled, the port state determines what forwarding action is taken on traffic. P ossible port states are: – Disabled — The port link is currently down.
Dell PowerConnect 28xx Systems User Guide 119 • Pr i o r i t y — The priority value of the port. The priority value influences the port ch oice when a bridge has two ports connected in a loop. The prio rity value is between 0-240. The priori ty value is provided in increments of 16.
120 Dell PowerConnect 28xx Systems User Guide Defining STP LAG Settings The STP LAG Settings page contains fields for assigning STP aggregating po rt parameters. T o open the STP LAG Settings page, click Switch Spanning T ree LAG Settings in the tr ee view .
Dell PowerConnect 28xx Systems User Guide 121 • LAG State — Current STP state of a LAG. If enabled, the LAG state determines what forwarding action is taken on traffic. If the bridge discover s a malfunctioning LAG, th e LAG is placed in the Broken state.
122 Dell PowerConnect 28xx Systems User Guide Modifying the LAG STP Parameters 1 Open the STP LAG Settings page. 2 Select a LAG from the Select a LAG drop-down menu. 3 Modify the fields as desired. 4 Click Apply Changes . The STP LAG parameters are modifi ed, and the device is updated.
Dell PowerConnect 28xx Systems User Guide 123 Figure 7-19. Rapid Spanning T ree (RSTP) • Interface — P ort or LAG on which Rapid STP is enabled. • Rol e — The port role assigned by the STP algorithm in or der to provide to STP paths.
124 Dell PowerConnect 28xx Systems User Guide 3 Click Apply Changes . Rapid STP is en abled, and the device is updated. Configuring VLANs VLANs are logical subgroups of a L o cal Area Network (LAN) cr eated via software rather th an defining a hardwar e solution.
Dell PowerConnect 28xx Systems User Guide 125 Figure 7-20. VLAN Membership • Show VLAN — Lists and displays specific VLAN inform ation according to VLAN ID or VLAN name. • VLAN Name — The user -defined VLAN name. • Unauthorized Users — Enables or disables u nauthoriz ed users from access ing a VLAN.
126 Dell PowerConnect 28xx Systems User Guide Figure 7-21. Create New VLAN 3 Enter the VLAN ID and name. 4 Click Apply Changes . The new VLAN is added, and the device is updated. Modifying VLAN Membership Groups 1 Open the VLAN Membership page. 2 Select a VLAN from the Show VLAN drop-down menu.
Dell PowerConnect 28xx Systems User Guide 127 The VLAN P ort Membership T able displays the ports and the ports st ates, as well as L AGs. P ort s which are LAG members ar e not displayed in the VLA N P ort Membership T ab le . Assigning Ports to a VLAN Group 1 Open the VLAN Membership page.
128 Dell PowerConnect 28xx Systems User Guide Defining VLAN Ports Settings The VLAN P ort Settings page contains fields for ma naging ports that ar e part of a VLAN. The port default VLAN ID (PVID) is configur ed on the VLAN P ort Settings page. All untagged packets arriving to the device are tagged by the ports PVID.
Dell PowerConnect 28xx Systems User Guide 129 The VLAN port settings are defined, and the device is updated. Displaying the VLAN Port T able 1 Open the VLAN P ort Settings page.
130 Dell PowerConnect 28xx Systems User Guide Figure 7-24. VLAN LAG Setti ng • LAG — The LAG number included in the VLAN. • PVID — Assigns a VLAN ID to untagged pack ets. The possible field va lues are 1-4095. VLAN 4095 is defined as per standard and industry practice, as th e Discard VLAN.
Dell PowerConnect 28xx Systems User Guide 131 Aggregating Ports P ort Aggr egation optimizes port usage by linking a grou p of ports to gether to fo rm a single Link Aggr egated Group (LAG). P ort Agg regation multiplies the bandwidth between the devices, increases port flexibility , and provides link redundancy .
132 Dell PowerConnect 28xx Systems User Guide Defining LAG Membership The LAG Membership page contains fields for assig ning ports to LAGs. LAGs can include up to eight ports.
Dell PowerConnect 28xx Systems User Guide 133 Defining Multicast Global Parameters Layer 2 switching forwards Mu lticast packets to all relevant VLAN ports by default, treating the pack et as a Multicast transmissi on.
134 Dell PowerConnect 28xx Systems User Guide Enabling IGMP Snooping on the Device 1 Open the Multicast Global P arameters page. 2 Select Enable in the IGMP Snooping Status field.
Dell PowerConnect 28xx Systems User Guide 135 The following table contains the IGMP port and LAG members management settings: Adding Bridge Multicast Addre sses 1 Open the Bridge Multicast Group page. 2 Click Add . The Add Bridge Multicast Group page opens: Figure 7-28.
136 Dell PowerConnect 28xx Systems User Guide 6 Click Apply Changes . The bridge Multicast address is assigned to the Multicast grou p , and the device is updated . Defining Ports to Receive Multicast Service 1 Open the Bridge Multicast Group page. 2 Define the VLAN ID and the Bridge Mu lticast Address fields.
Dell PowerConnect 28xx Systems User Guide 137 Figure 7-29. Bridge Multicast Forward All • VLAN ID — Identifies a VLAN. • Po r t s — P orts that can be added to a Multicast service. • LAGs — LAGs that can be added to a Multicast service. The contains the settings for ma naging router an d port sett ings.
138 Dell PowerConnect 28xx Systems User Guide Attaching a Port to a Multicast Router or Switch 1 Open Bridge Multicast F orward All page. 2 Define the VLAN ID field . 3 Select a port in the Po r t s table, and assign the port a value. 4 Click Apply Changes .
Dell PowerConnect 28xx Systems User Guide 139 IGMP Snooping The IGMP Snooping page contains fields for adding IGMP me mbers. T o open the IGMP Snooping page, click Switch Multicast Support IGM P Snooping in the tree view . Figure 7-30. IGMP Snooping • VLAN ID — Specifies the VLAN ID.
140 Dell PowerConnect 28xx Systems User Guide Enabling IGMP Snooping on the Device 1 Open the IGMP Snooping page. 2 Select the VLAN ID for the d evice on which IGMP snooping needs to be enabl ed. 3 Select Enable in the IGMP Snooping Status field. 4 Complete the fields on the page.
Dell PowerConnect 28xx Systems User Guide 141 8 V iewing Statistics The Statistic pages contain links to device i nformation for R MON, and CPU utilization. V iewing RMON Statistics Remote Monitoring (RMON) cont ains links for viewing networ k information from a remote location.
142 Dell PowerConnect 28xx Systems User Guide • Received Bytes (Octets) — Number of octets received on the interface since the device was last refr eshed.
Dell PowerConnect 28xx Systems User Guide 143 Figure 8-2. CPU Utilization The CPU Utilizatio n page contains the fo llowing informatio n: • Refresh Rate — Amount of time that passes before the statisticsare r efreshed.
Dell PowerConnect 28xx Systems User Guide 144 9 Configuring Quality of Service This section provides information for defining an d configuring Quality of Service (QoS) parameters. To o p e n t h e Quality of Ser vice page, click Quality of Service in the tree view .
Dell PowerConnect 28xx Systems User Guide 145 DSCP values can be mapped to priority queu es. Th e following table contains the default DSCP mapping to forwarding queue values: DSCP mapping is e nabled on a per -system basis. CoS Services After packets are assigned to a specific queue, CoS services can be assigned to the q ueue(s).
146 Dell PowerConnect 28xx Systems User Guide Defining CoS Global Parameters This section contains the following topics: • Defining CoS Settings • Defining QoS Interface Settings • Defining Queu.
Dell PowerConnect 28xx Systems User Guide 147 1 Open the CoS Settings page . 2 Select Enable in the CoS Mode field. 3 Click Appl y Changes. Class of Service is enabled on the device. Selecting T rust: 1 Open the CoS Settings page . 2 Select Tr u s t in the Tr u s t M o d e field.
148 Dell PowerConnect 28xx Systems User Guide Assigning QoS/CoS settings for an interface: 1 Open the Interface Settings page. 2 Select an interface in the Interface field. 3 Define the fields. 4 Click Apply Changes . The CoS settings are assigned to the interface.
Dell PowerConnect 28xx Systems User Guide 149 • Queues — The Queue number . • Strict P riority — Specifies if traffic sche duling is based strictl y on the queue priority . • WRR — Specifies if traffic s cheduling is base d on the W ei ghted Round Robin (WRR) weights to egress queues.
150 Dell PowerConnect 28xx Systems User Guide Mapping CoS V alues to Queues The CoS to Queue Mapping T able page contains fields for classifyin g CoS settings to traffic queues. T o open the CoS to Queue Mapping T able page, click Quality of Service CoS Global P arameters CoS to Queue in the tree view .
Dell PowerConnect 28xx Systems User Guide 151 Mapping DSCP V a lues to Queues The DSCP to Queue page provides fields for defining output qu eue to specific DSCP fi elds. F o r the list of the DSCP default queue settings, see "DSCP to Queue Mapping T able Default V alues" on page 145.
152 Dell PowerConnect 28xx Systems User Guide 1 Open the DSCP to Queue page. 2 Check the Res to r e D ef a ul ts checkbox. 3 Click Apply Changes . The default values are r estored.
Dell PowerConnect 28xx Systems User Guide 153 A Managing the Device Using the CLI A limited number of CLI commands ar e available for managing the device.
154 Dell PowerConnect 28xx Systems User Guide 2 In the Run window , type Telnet <IP address > in the Open field. 3 Click OK to begin the T elnet session. Using the CLI This section provides in formation for using the CLI. Command Mode Overvi ew The CLI is divided into command mo des.
Dell PowerConnect 28xx Systems User Guide 155 Privileged EXEC Mode P rivileged access can be protec ted to prevent unauthorized access an d ensure operating para meters. P asswords are displayed in the ***** format on the screen, and ar e case sensitive.
156 Dell PowerConnect 28xx Systems User Guide The following example illustrates how to access Global Co nfiguration Mode and return back to the P rivileged EXEC Mode: console# console#configure consol.
Dell PowerConnect 28xx Systems User Guide 157 CLI Commands Command: copy T o copy any file from a source to a destination, use the copy P rivileged EX EC command. copy source-url destination-url Syntax Description • source-url — The location URL or reserved keyword of the source file to be copied.
158 Dell PowerConnect 28xx Systems User Guide Understanding Invalid Combinations of Source and Destination Some invalid combinations of source and de stination exist. Specifically , you cannot copy the following: • If the source file and de stination file are the same file.
Dell PowerConnect 28xx Systems User Guide 159 Command modes All configuration modes Command: end T o end the current configuration session and return to privileged EXEC mode, us e the end global configuration command.
160 Dell PowerConnect 28xx Systems User Guide Console# Command: exit (EXEC) T o close an active term inal sessio n by logging off the router , use the exit command in EXEC mode. exit Syntax Description This command has no ar guments or k ey words Command Mode EXEC Default value This command has no default setting.
Dell PowerConnect 28xx Systems User Guide 161 Parameters range • interface — V alid Ethernet port. Command Modes Global Configuratio n Example Console(config)# interface ethernet g1 Console(config.
162 Dell PowerConnect 28xx Systems User Guide Syntax Description • vlan-id — VLAN ID Parameters range • vlan-id — V alid VLAN Command Modes Global Configuratio n Usage Guidelines In case the VLAN doesn't exist ("ghost VLAN") only partial list of the commands would be available under the interface VLAN conte xt.
Dell PowerConnect 28xx Systems User Guide 163 • prefix-length —Range: 8-30 • default-gateway ip-address —V alid IP address Defaults No IP address is defined f or interfaces Command Modes Interface Configuration VLAN mode. User Guidelines • Assigning an IP address to an interface does not disable L2 protocols, such as STP .
164 Dell PowerConnect 28xx Systems User Guide • packet_count — 0 - 65535 • time_out — 50 - 65535 Command Mode EXEC Default value This command has no default setting.
Dell PowerConnect 28xx Systems User Guide 165 64 bytes from 10.1.1.1: icmp_seq=1. time=8 ms 64 bytes from 10.1.1.1: icmp_seq=2. time=8 ms 64 bytes from 10.
166 Dell PowerConnect 28xx Systems User Guide show system mode show ip inte rface show interfaces configuration show interfaces status show interfaces port-cha nnel show vlan show interfac es switchpo.
Dell PowerConnect 28xx Systems User Guide 167 • rw — Specifies read-write access • su — Specifies SNMP administrator access • ipv4-address — Management station IPv4 address.
168 Dell PowerConnect 28xx Systems User Guide Default No user is defined. Command modes Global Configuratio n Example Console (config)# username bob password lee privilege 15.
169 Glossary This glossary contains key technical words of interest. A Access Mode Specifies the method by which user access is granted to the system. Access P rofiles Allows network managers to define profiles and rules for accessing the device.
170 Baud The number of signaling ele ments transmitted each second. Best Effort T raffic is assigned to the lowest priority queue, and packet delivery is not guaranteed.
171 CLI Command Line Interface . A set of line commands used to config ure the system. Communities Specifies a group of users which r etain s the same system access rights. CPU Central P rocessing Unit . The part of a computer that processes information .
172 FIFO F irst In F irst Out. A queuing process where the first packet in the queue is the first pack et out of the packet. Flapping Flapping occurs when an interfaces state is constantly changing. F o r example, an STP port constantly changes from listening to learning to forwarding.
173 IEEE 802.1p P rioritizes network traffic at the data-link/MAC sublayer . IEEE 802.1Q Defines the operat ion of VLAN Bridges that permit the definition, operation, and administration of VLANs with in Bridged LA N infrastructures. Image F ile The system imag e is saved in a Flash s ector called image.
174 MAC Address Learning MAC Addr ess Learning chara cterizes a learning bridge, in which the packet’s source MAC address is recor ded. P ackets destined for that a ddress are forwarded only to the bridge interface on which that address is loc ated.
175 PDU P rotocol Data Uni t. A data unit specified in a layer protocol consisting of pr otocol control information and layer user data. PING P acket Internet Groper . V erifies if a specific IP address is available. A pack et is sent to another IP address and waits for a r eply .
176 R unning Configuration F ile Contains all Star tup file commands, as well as all commands entered during the curr ent session. After the device is powered down or r ebooted, all commands stored in the R unning Configuration file are lost. S Segmentation Divides LANs int o separate L AN segments for bridging and routing.
177 Te l n e t T eletype Network P rotocol. A network protocol used on the Internet or local ar ea networks to provide bidirectional inter active communications. Enables system users to log in and use resources on re mo te networks. TFTP T rivia l F ile T ransfer Protocol .
178.
179 Index Numerics 802.1d, 15 A Access mode, 75 Address Resolution Protocol, 169 Aggregat ed link, 131 AH, 169 ARP , 169 Asset, 58 Auto-Negotiation, 37 B Boot V ersion, 17 0 BootP , 170 BPDU, 170 Brid.
180 IEEE 802.1Q, 173 IGMP , 173 Image File, 79, 173 Ingress, 173 Interface mode, 156 Internetwork Packet Exchange, 173 IP , 1 73 IPM, 173 IPX, 173 ISIS, 173 J Jumbo frames, 173 L L2TP , 173 LAG , 104, 173 LAGs, 136 Local User Database, 68 Loops, 1 14 M MAC Address, 173-174 MAC address, 1 12 Management Information Base.
181 T TFTP , 177 T ime Domain Reflectometry , 64 T ree view , 54 T rivial File T ransfer Protocol, 177 T runk Configuration Page, 104 Tr u s t , 1 4 7 U UDP , 177 Understanding the interface, 54 Uploa.
182.
Dell PowerConnect 28xx Systems User Guide 183 A Internal Revision History for Onl ine Help and Us er Guide Rev Date Updated by Description of Change A04 27-Feb-12 Y osi Katan • Updated the Conf ig s.
184 Dell PowerConnect 28xx Systems User Guide.
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 Dell 28XX 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 Dell 28XX - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Dell 28XX imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Dell 28XX ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Dell 28XX, 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 Dell 28XX.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Dell 28XX. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Dell 28XX 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.
