Manuale d’uso / di manutenzione del prodotto 3C16491 del fabbricante 3Com
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http://www.3com.com/ www.3com.com Part No. 10015243 Rev . AA Published August 2006 Baseline Switch 2426 PWR Plus User Guide Installationsanleitung 3C16491 Part No.
3Com Corporation • 350 Campus Dri ve • Marlborough • MA USA 01752-3064 Copyright © 2006, 3C om Corporation. All rights rese rved. No part of this documentation may be r eproduced in any form or.
C ONTENTS A BOUT T HIS G UIDE Conventions 7 Documentation Comments 8 Produc t Registration 8 1 I NTRODUCING THE B ASELINE S WITCH Overview of the Baseline Switch 9 Features and Capabi lities 9 Autosen.
Automatic IP Configuration 33 IP Setup 34 Backup Configuration 35 Restore Config uration 35 Firmware Upgrade 36 Initialize 37 Reboot 37 System Access 38 System Time 40 SNMP 40 Configuring VLANs 42 VLA.
R EGULATORY N OTICES G LOSSARY I NDEX.
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A BOUT T HIS G UIDE This guide describes how to install your 3Com Switch and perform initial management confi gurations. This guide is intended for use by those r esponsible for installing and setting up network equipme nt; consequently , it assumes a basic working knowledge of LANs (Local Ar ea Networks).
8 A BOUT T HIS G UIDE Documentation Comments Y our suggestions are very important to us. They will help make our d ocumentation more useful to you. Please e-mail comments about this document to 3Com at: pddtechpubs_comments@3com.
1 I NTR ODUCING THE B ASELINE S WITCH This chapter pr ovides an ov erview of the featur es and capabilities of the 3Com Baseline Swit ch 2426 PWR Plus. It also identifies the contents of the Switch package and helps you get to know the physi cal features of the device.
10 I NTRODUCING TH E B ASELINE S WITCH Power -over -Ethernet Capability The Switch pr ovides 24 front panel RJ-45 ports that support the IEEE 8 02.3af Power -over -Ethernet (PoE) standard.
Physical Fe atures 11 téléphonique central privé ou pu blic. Raccorder seulement connecteurs de données RJ-45, systèmes de réseaux de téléphonie ou téléphon es de réseaux à ces prises. Il est possible de raccorder des câbles protégés ou no n protégés avec des jacks protégés ou non protégés à ces prises de données.
12 I NTRODUCING TH E B ASELINE S WITCH (3) Link/Activity Status LEDs The first (top) and thi rd row of LEDs, which ar e colored yellow or gr een, show the link, activity and speed status of the relate.
Physical Fe atures 13 10/100/1000BASE-T Ports 1000BASE-T only operates in full duplex mode. 10/100BASE-TX can be in half or full d uplex mode. Gigabit Comb o Ports (5) Power LED The Power LED shows the power status of the Switch. (6) Self-adhesive Pads The unit is supplied with four self-a dhesive rubber pads.
14 I NTRODUCING TH E B ASELINE S WITCH Package Contents Befor e installing and using the Switch, verify that your Switch package is complete. The Switch comes with: ■ One power cord ■ Four standar.
2 I NSTALLING THE S WITCH This chapter contain s information that you need to install and set up the Switch . It covers the following topics: ■ Befor e Y ou Begin ■ Positioning the Switch ■ Rack.
16 I NSTALLING THE S WITCH Alternatively , the Switch can be rack-mounted in a wiring closet or equipment r oom. A mounting kit, containing two mounting brackets and four scr ews, is supplied with the Switch. When deciding wher e to position the Switch, ensure that: ■ It is accessible and cables can be conn ected easily .
Rack-Moun ting or Free- Standing 17 3 Insert the two screws suppli ed in the mounting kit and fully tighten with a suitable screwdriver . Figur e 2 Rack Mounting t he Unit 4 Repeat steps 2 and 3 for the other side of the unit. 5 Insert the unit into the 19 -inch rack and secure with suitable scr ews (not provided).
18 I NSTALLING THE S WITCH If you are pl acing Switch units one on top of the other , you must use the sel f-adhesive rubber pads supplied. Apply the pads to the underside of each Swit ch, sticking one in the marked area at each corner .
Using SFP T ranceivers 19 If POST fails, try the following: ■ Power off the Switch, an d then power it on again. Check the Power LED and see if POST was successfully completed. ■ Reset the Switch. See “Resetting to Factory Defaults” on page 73 .
20 I NSTALLING THE S WITCH ■ 1000BASE-LX SFP transceiver Use this transceiver to c onnect the Switch directly to a single mode fiber -optic cable or to multi - mode fiber using a conditioned launch cable. If the SFP transceiver is faulty , it will not operate within the Switch.
Performing Sp ot Checks 21 Performing Spot Checks At frequent in tervals, you should visually check the Switch. Regular checks can gi ve you an early war ning of a possible failur e; any problems can then be attended to when there will be least ef fect on users.
22 I NSTALLING THE S WITCH.
3 C ONNECTING TO THE W EB I NTERFACE The Switch has a built-in Web interface that you can use to set the admin password, change the IP addr ess that is assigned to the Switch, and configure its advanced settings. If you only want the Switch to function as a basic layer 2 switch, you do not need to access the Web interface and configure the Switch.
24 C HAPTER 3: C ONNECTING TO THE W EB I NTERFACE The Discovery applicat ion ca n be used for detecting and connect ing to the Switch on the network. The application will launch a Web interface that provides th e user with options to configur e, modify , an d upgrade the Switch.
Logging On to the Web In terface 25 Figure 5 Discover ed Devices Screen 3 On the Discovered Devices scr een, click Base - line Switch 2426 PWR Plus , and then click Nex t . The Completing the 3Com Discovery Applica - tion screen appears. 4 Click Finish .
26 C HAPTER 3: C ONNECTING TO THE W EB I NTERFACE Navigating the We b Interface The Web interface has be en designed to enable you to easily perform advanced conf iguration tasks and vi ew informa tion about the Switch. Menu The menu is located on the left side of the Web interface.
Navigating the Web Interface 27 Ta b l e 1 lists the available items on the menu. Ta b l e 1 Available Menu Items Menu Item Description Device Summary Contains tabs that allow you to: ■ Provide a summary of the Switch’s basic settings and versions of current components.
28 C HAPTER 3: C ONNECTING TO THE W EB I NTERFACE IGMP Snooping Allows you to en able or disable IGMP snooping. IGMP Query Allows you to en able or disable IGMP query mode. Broadcast Storm Allows you to en able or disable rate limiting. PoE Contains tabs that allow you to: ■ Display PoE summary.
Navigating the Web Interface 29 Buttons Depending on th e screen that is cur rently displayed, the following butt ons may appear: ■ Apply – Click to save and apply any changes that you have made .
30 C HAPTER 3: C ONNECTING TO THE W EB I NTERFACE Accessing the Interface Without Using Discovery The Discovery app lication works by automatically de tecting th e IP address that is assigned to the Switch , and then using that address to connect to the Web interface.
4 C ONFIGURING THE S WITCH This chapter provides information on how to configure the Switch’ s advanced features. T opics include: ■ Device Summar y Information ■ Administration Sett ings ■ Co.
32 C HAPTER 4: C ONFIGURING THE S WITCH ■ Color Key Device View Contains fields that di splay the system, switch, and manage ment switch informatio n to identify the Switch.
Administra tion Settings 33 Color Key Description of the color coding. Figure 10 Color Key Administration Settings The Administra tion menu includes ei ght administration it ems: ■ IP Setup ■ Back.
34 C HAPTER 4: C ONFIGURING THE S WITCH T o determ ine the exact IP address that the Switch assigns to itse lf during auto IP configuration, check th e sticker on the base of the Switch. T his sticker contains th e MAC address and default IP address of the Switch.
Administra tion Settings 35 Figure 11 IP Settings Scr een Backup Configuration T o save the Switch c onfiguration settings: 1 Click Administratio n , then Backup Configuration on the menu. The Backup Configuration scr een appears. Figure 12 B ackup Configuration 2 Click OK.
36 C HAPTER 4: C ONFIGURING THE S WITCH 2 Click Browse to locate the backup file on your computer to r estore the configuratio n settings. 3 Click Restore to copy the configuration back to the Switch. For security purposes, restoring the configuration does not chang e the passwor d.
Administra tion Settings 37 case the upgrade process fails f o r any reason (for example, the connection betw een the computer and the Switch is lost while the new firmware is being copied to the Switch). A progr ess screen displays while the upgrade is taking place.
38 C HAPTER 4: C ONFIGURING THE S WITCH System Access Click Admin istratio n , then System Access on the menu. A screen appe ars with six system access tabs: ■ User Summary ■ Create User ■ Modif.
Administra tion Settings 39 Create User This page allows you to create a user and define the access level and passwor d for that user . Figure 16 Crea te User Screen Modify User This page allows you to modify a use r’ s access level and password.
40 C HAPTER 4: C ONFIGURING THE S WITCH Remove User T o re move a user from the Switch, click on the user name, then click Remo ve . Figure 18 Remove Use r Screen System Time Click Admin istratio n , then System Time on the menu. This scr e en allows you to set the system time.
Administra tion Settings 41 ■ SNMP Remove Summary Displays the list community access strings. Figure 20 SNMP Summary Scr een Setup Enable or disable the SNMP Agent Status. Figure 21 SNMP Setup Scr een SNMP Add This page allows you to create community strings for m anagement acce ss.
42 C HAPTER 4: C ONFIGURING THE S WITCH SNMP Remove This page allows you to r emove community strings. Figure 23 SNMP Remo ve Screen Configuring VLANs A virtual LAN (VLAN) is a collection of network nodes that share the same collision domain, regar dless of their physical location or connection point in the net w ork.
Configurin g VLANs 43 VLAN Click Device , then VLAN on the menu. A screen appears with seven tabs that include: ■ Setup ■ Modify VLAN ■ Modify Port ■ Rename ■ Remove ■ Port Detail ■ VLAN Detail Setup Use the Setup screen to create VLANs on the Switch.
44 C HAPTER 4: C ONFIGURING THE S WITCH By default, all ports belong to VLAN 1 as an untagged mem ber . How ever , the y can belong to multiple VLANs as a tagged member .
Configurin g VLANs 45 Figure 26 Modify Port Screen 1 Select a membership use. Available options for each port include (only one op tion can be associated with a single port): ■ Not a member ■ Ta g g e d ■ Untagged 2 Select a port to associat e with the membership.
46 C HAPTER 4: C ONFIGURING THE S WITCH Remove Use the Remove screen to r emove a VLAN. Figure 28 Remove Scr een 1 Enter a set of VLAN s or select all VLANs to add to the r emove list, then click Select . 2 From the list of selected VLANs choose a VLAN to remo ve, or click the Sele ct All butt on to select all the VLANs.
Configurin g VLANs 47 Figure 30 VLAN Detail Scr een Forwarding T agged/Untagged Frames Each port on the Switch is capable of passing tagged or unta gged frames.
48 C HAPTER 4: C ONFIGURING THE S WITCH Setting Up T wo VLANs on the Same Switch Figure 31 illustrates how you can set up a simple VLAN on the Switch using deskto p connections.
Configurin g VLANs 49 Figure 32 T agged VLAN Configuration T o set up the configuration sho w n in Figur e 32 , do the following: 1 Create VLAN2 on both Switch 1 and Switch 2. Y ou need not create VLAN1 since it exists by default. 2 On Switch 1, set the ports that you want to be part of VLAN2 to Untagged .
50 C HAPTER 4: C ONFIGURING THE S WITCH path is maintained between spanning tree-compliant networked devices by: ■ Disabling redu ndant paths when the main paths are operational.
Configurin g VLANs 51 IGMP Snooping This switch uses IGMP (Internet Group Management Proto col) to query for any attached hosts that want to receive a specific multicast service. It identifie s the ports containing hosts r equesting to join the service and sends data out to those ports on ly .
52 C HAPTER 4: C ONFIGURING THE S WITCH A broadcast storm is an incorr ect packet sent out on a network that causes most h osts to res pond all at once, typically with wr ong answers that start the process over again. Broadcast storms use su bstantial netw ork bandwidth and may caus e network time-outs.
Configurin g Port Settings 53 Setup Use the Setup t a b to configur e the device and port PoE setting s. Th e settings include: ■ PoE State – Ena bles and disables PoE for the switch. ■ Auto – Allows the switch to ma nage the PoE budget for select ed ports.
54 C HAPTER 4: C ONFIGURING THE S WITCH Summary Use the Summary tab to display Port S tate, Flow Control, Speed, Default VLAN ID, Link T ype, or Duplex for all the ports. Figure 39 Port Administration Summary Screen Detail Use the Detail tab to display detailed port setting info rmation for a port.
Configurin g Port Settings 55 ■ Flow Contr ol – Enables and disables flow control on the port. Wh en flow control is enabled for the port, the Switch regulates the packet flow so that a se nding device does not tra nsmit more pack ets than a receiving device can pr ocess.
56 C HAPTER 4: C ONFIGURING THE S WITCH 1000 Mbps connections ar e always full-duplex. Half-duplex connections are only available for 10 Mbps and 100 Mbps settings. CAUTION: Before manually setting a port to full-duplex, verify that the device connected to the port is also manually set to the same speed and duplex setting.
Configurin g Port Settings 57 ■ All ports in a trunk must be conf igured in an identical manner , including communication mode (that is, speed, duplex mode and flow control).
58 C HAPTER 4: C ONFIGURING THE S WITCH T o create a new link aggregation gr oup: 1 Enter a link aggr egation group ID in the box field. 2 Select the ports to add to the goup. 3 Click Apply . Modify Use the Modify tab r eassign port members to a link aggr egation group.
Configurin g Port Settings 59 Spanning T ree per Port This administrative tool suppor ts the configuration of the Switch to forward, or block and discard 802.1D spanning tree BPDU packets. Spanning tree is a brid ge-based system for provid ing fault tolerance on networks and can be used to detect and disable network loops.
60 C HAPTER 4: C ONFIGURING THE S WITCH Summary Use the Summary tab to display Status, Edged Port, Link T ype, Path Cost , State, or Port Priority for all the ports. Figure 46 Spann ing T ree Summary Screen Detail Use the Detail tab to display detailed spanni ng tree information fo r a port.
Configurin g Port Settings 61 ■ Link T ype – Choose between Point-to-Point, Shared, or Auto for the link type. ■ Path Cost – The path cost is used to determine t he best path be tween devices. The path cost method is used to dete rmine the range of values that can be assigned to each interface.
62 C HAPTER 4: C ONFIGURING THE S WITCH Figure 49 Port Mirr oring Setup Screen T o set up port mirror ing: 1 Connect a network analyzer to a port. 2 Access the Web interface. Click Port, then Port Mirroring o n the menu . The Port Mo nitoring Setup Scr een appears.
QoS V oIP T raffic Settin gs 63 3 Click Apply . QoS V oIP T raffic Settings Using the Web interface, you can configur e the V oice over Internet Protocol (V oIP) settings.
64 C HAPTER 4: C ONFIGURING THE S WITCH Y ou must first create a VLAN from the VLAN Setup page before you can assign and configure a V oice VLAN. Figure 52 QoS V oIP Setup Screen Port Setup Use the Port Setup tab to configure t h e port or trunk setting for V oice VLAN.
QoS V oIP T raffic Settin gs 65 Port Detail Use the Port Detail tab to display the V oice VLAN informatio n for selected p orts. Figure 54 QoS Port Detail Scr een OUI Summary Use the OUI Summary tab to display the list of Organizational Uniqu e Identifier for a company and their description.
66 C HAPTER 4: C ONFIGURING THE S WITCH T o remove an OUI fr om the list: 1 Select a T elephony OUI from the list. 2 Click Remove . Figure 56 QoS OUI Modify Screen Security Using the Web interface, you can configure the RADIUS Client and 802.1X settings.
Security 67 Figure 57 RADIUS Client Detail Screen Configure Use the Configure tab to configure the RADIUS settings. The following parameters are available: ■ Max Retries – Sets the number of retries of sending authentication r equests. ■ Timeout – Sets the interva l between sending authentication requests.
68 C HAPTER 4: C ONFIGURING THE S WITCH 802.1X Settings The IEEE 802.1X (dot1x) stand a rd def ines a port-based access control procedur e tha t prevents unauthor ized access to a network by requiring users to first subm it credentials for authentication.
Security 69 Figure 60 802.1X De tail Screen Setup Use the Setup tab to configure the 80 2.1X authenticaion settings. Th e following fields are available: ■ System Authentication – Sets the global setting for 802.1X. (Default: Disabled) ■ Operation Mode – Allows single or multiple hosts (clients) to connect t o an 802.
70 C HAPTER 4: C ONFIGURING THE S WITCH ■ Reauthentication Period – Sets the time period after which a connected client must be re-authenticate d. (Range: 1 -65535 seconds; Default: 3600 seconds) ■ Quiet Period – Sets the time that a switch port waits af ter the Max Request Count has been exceeded before attempting to acqu ire a new client.
Monitoring 71 Figure 62 Addr ess T able Scr een Cable Diagnostics The Switch provides cable diagnostic, which helps you detect an d resolve issues with the attached cables.
72 C HAPTER 4: C ONFIGURING THE S WITCH Diagnostics Use the Diagnostics tab to display ind ividual port informa tion on T est Re sult, Cable Fau lt Distance, and Last Update.
5 T R OUBLESHOOTING This chapter lists some issues that you may encounter while installin g, using, and manag - ing the Switch, with suggested cours es of cor - rective action to take. If you encounter an issue that is not listed here and you cannot solve it, check the 3Com Knowledgebase at http://knowledgebase.
74 C HAPTER 5: T ROUBLESHOOTING The Switch will perform automatic IP configu - ration after you reset it. See “ Automatic IP Configuration ” on page 33 for more informa - tion. Forgotten Password If you forget the passwor d to the Web interf ace after you set it, you will need to reset the Switch to regain access.
Solving LED Issues 75 ■ If the connection is to a workstation, that the workstation's network interface is installed and configured corr ectly . ■ The correct category of cable is being used for the requir ed link speed. Category 3 cables can be used for 10BASE-T operation only .
76 C HAPTER 5: T ROUBLESHOOTING All ports appear to show continual activity . There may be broadcast storms on the net - work. Remove port connections one at a time, waiting a few seconds between e ach port.
A O BTAINING S UPPORT FOR Y OUR P RO D U C T Register Y our Product W arranty and other service benefits start from the date of purchase, so it is i mportant to register your product quickly to ensur e you get full use of the warranty and other service benefits available to you.
78 A PPENDIX A: O BTAINING S UPPORT FOR Y OUR P ROD UCT Updates you must first reg i ster your product on the 3Com Web site at http://eSupport .3com.com/ . First time users will need to apply for a user name and passwor d. A link to softwar e downloads can be found at http://eSupport.
Contact Us 79 . Country T elephone Numb er Asia, Pacific Rim T elephon e T ech nical Support an d Repair Australia Hong Kong India Indonesia Japan Malaysia New Zealand Pakistan Philippines P .
80 A PPENDIX A: O BTAINING S UPPORT FOR Y OUR P ROD UCT Country T elephone Number Latin America T elephone T echn ical Support and Rep air Antigua Bar buda Argentina L ocal Number Argentina Argentina .
B T ECHNICAL I NFORMATION Related Standards The Baseline Switch 2426 PWR Plus has been de signed to the following standar ds: Environmental Physical Electrical Functional IEEE 802.3 (Ether net), IEEE 802.3u ( Fast Ether net), IEEE 8 02.3ab and I EEE 802.
82 A PPENDIX B: T ECHNIC AL I NFORMATION.
C S AFETY I NFORMATION Important Safety Informati on Please re fer to the safety information found in th e 3Com Switch Family Safety and Regulatory Information manual included wi th this product. Y ou can find the 3Com Switch Fami ly Safety and Regulatory Information manual on the product CD-ROM that was included with your switch.
84 A PPENDIX C: S AFETY I NFORMATION.
85 R EGULATORY N OTICES FCC Statement This equipment has b een tested and found to comply wit h the limits for a Class A digital device, pursuan t to Part 15 of the FCC Rul es. These limits are designed to provide reasonable protection against harmful interfer ence in a commeric a l environment.
86.
G LOSSARY 10BASE- T The IEEE specification for 10 Mbps Ethernet over Category 3, 4 or 5 twisted pair cable. 100BASE- TX The IEEE specification for 100 Mbps Fast Ethernet over Category 5 twisted-pair cable. 1000BASE-LX IEEE 802.3z spec ification for Gigabit Ethernet over 9/125 micron cor e single-mode fiber cable.
88 G LOSSARY Category 3 Cables One of five grades of T wisted Pair (TP) cabling defined by the EIA/TIA-568 sta ndard. Category 3 is voice grade cable and can only be used in Ethernet networks (10BASE-T) to transmit data at speeds of up to 10 Mbps.
89 Full Duplex A system that allows packets to be transmitted and received at the same time and, in ef fect, doubles the potential thr oughput of a link. Half Duplex A system that allows packets to be transmitted and received , but not at the same time.
90 G LOSSARY switches) that cover a relati vely small geographic area (usually not larger than a floor or building). LANs ar e characte rized by h igh tra n smission speed s over short distances (up to 1000 metr es). Layer 2 Data Link layer in the ISO 7-Layer Data Communications Protocol.
91 Server A computer in a network that is shared by multi ple end stations. Servers provide end station s with access to shared network service s such as computer files and printer queues.
92 G LOSSARY VLAN A Virtual LAN is a collection of network no des that share the same collisi on domain regardless of their physical location or connection point in the n etwork. A VLAN serves as a logical workgroup with no physical barriers, and allows users to shar e information and resour ces as though located on the same LAN.
I NDEX Numbers 1000BASE-LX 87 1000BASE-SX 87 1000BASE-T 87 100BASE-TX 87 10BASE-T 87 A auto IP configuration 33 default IP address 34 default mask 34 B bandwidth 87 Baseline Switch 2848-SFP 81 C categ.
94 I NDEX N network analyzer 61, 62 network defined 90 P passwor d changing 38 default (b lank) 38 setting 32 port settings configuring 53, 63, 66 positioning the Swi tch 15 POST 18 protocol defined 9.
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 3Com 3C16491 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 3Com 3C16491 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso 3Com 3C16491 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul 3Com 3C16491 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il 3Com 3C16491, 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 3Com 3C16491.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il 3Com 3C16491. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo 3Com 3C16491 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.
