3Com 2250 manuale d’uso

http://www.3com.com/ Baseline Switch 2250 Plus (3C16476BS) User Guide Part No. DUA16476B-SAA02 Published April 2005[...]

3Com Corporation • 350 Camp us Driv e • Marlborough • MA USA 01752-3064 Copyright © 2004, 2005, 3Com Corporati on. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (suc h as translation, transformation, or adaptation) without wr itten permission from 3Com Cor[...]

C ONTENTS A BOUT T HIS G UIDE Conventions 5 Related Documentation 6 Documentation Comments 6 1 I NTRO DUCING THE B ASELINE S WITCH Overview of the Baseline Switch 2250 Plus 7 Features and Capabilities 7 Autosensing of MDI/MDIX Connections 7 Autonegotiating 10/100 Mbps Ports 7 SFP Ports 8 T raffic Prioritization 8 Forwarding of BPDU Packets 8 Physic[...]

Setting the IP Addr ess 30 Configuring Port Setti ngs 31 Basic Port Configuration 31 Advanced Port Configuration 32 Default Port Settings 32 Configuring VLANs 32 Creating a VLAN 33 Deleting VLANs 33 Modifying VLANs 34 Defining VLAN Membership 34 Sample VLAN Configurations 34 Configuring T runking 36 Guidelines for Creating T ru nks 36 Creating, Mod[...]

A BOUT T HIS G UIDE This guide is intended fo r use by network administa- tors who ar e resp onsible for installing and setting up network equ ipment. Conseque ntly , it assu mes a basic working knowledge of LANs (local ar ea networks). Diese Anleitung ist f ür die Benut zung dur ch Netzwerkadmi nistratoren vorgesehen, die fü r die Installation u[...]

6 A BOUT T HIS G UIDE Related Documentation In addition to this guid e, each 3Com Baseline Switch 2250 Plus documentation set includes the followin g: ■ Online Help – Accessible from the Web interface, provides information that helps you perform tasks using the Web interface . ■ Release Notes – Provide information about the cur- rent softwa[...]

1 I NTR ODUCING THE B ASELINE S WITCH This chapter provides an ov erview of the featur es and capabilities of the 3Com ® Baseline Switch 2250 Plus. It also identifies the cont ents of the Switch package and helps you get to know t he physical features of the device. Overview of the Basel ine Switch 2250 Plus The 3Com® Baseline Switch 2250 Plus is[...]

8 C HAPTER 1: I NTRODUCING THE B ASELINE S WITCH SFP Ports The two SFP ports support f iber Gigabit Ethernet short-wave (SX) and long-wave (LX) SFP transceivers in any combination. This of fers you the flexibility of using SFP transceivers to provide connectivity between the Switch and a 1000 Mbps core network. When an SFP port is in operation, th [...]

Physical Features 9 able communication paths between swit ches and to determine the best available path and block less op ti- mal paths. For information on configuring BPDU forwar ding and blocking, r efer to “ Configuring the Spanning T ree ” on page 41 . Physical Features Figure 1 shows the front and r ear panels of the Switch. Th e numbers i[...]

10 C HAPTER 1: I NTRODUCING THE B ASELINE S WITCH Entweder geschützte oder ungeschützte Buchsen dürfen an diese Datenste ckdosen angeschlossen wer- den. The Switch has 48 10/100 Mbp s autonegotiating ports (ports 1 to 48 ). Their speed and duplex mode (half-duplex or full-duplex) ar e automatically deter- mined by the capabilities of the connect[...]

Physical Features 11 Ta b l e 5 10BASE-T/100BASE-TX/1000B ASE-T Ports (4) Module Acti ve LEDs The Module Active LEDs show the status of any SFP modules that are installed. (5) Power LED The Power LED shows the powe r status of the Switch. Flashing Packets are being r eceived or transmit- ted on the port Off Link not established, either nothin g is [...]

12 C HAPTER 1: I NTRODUCING THE B ASELINE S WITCH (6) Self-Adhe sive Pads The unit is supplied with four self-adh esive rubber pads. Do not apply the pads if you intend to rack- mount the unit. If the unit is to be part of a free-standing stack, apply the pads to each marked corner area on the under- side of the u nit. Place the unit on top of th e[...]

2 I NSTALLING THE S WITCH This chapter contains inform ation that you need to install and set up the Switch . It covers the following topics: ■ Positioning the Switch ■ Rack-Mount ing or Free-Standing ■ Supplying Power to the Switch ■ Connecting a Network Device ■ Connecting a Network Device ■ Performing Sp ot Checks Before Y ou Begin W[...]

14 C HAPTER 2: I NSTALLING THE S WITCH mends that you provide a minimum of 25 m m or 1 in. clearance). ■ The air is as free of dust as possible. ■ T emperature operating limits are not likely to be exceeded. It is r ecommended th at the uni t is installed in a clean, air conditioned environment. It is always good practice to wear an anti-static[...]

Rack-Mounting or Free-Standing 15 T o rack -mount the Switch: 1 Place the unit the rig ht way up on a hard, flat surface with the fr ont facing towar ds you. 2 Locate a mounting bracket over the mounting holes on one side of the unit. 3 Insert the tw o screws supplied in th e mounting kit and fully tigh ten with a suitable screwdriver . Figure 2 In[...]

16 C HAPTER 2: I NSTALLING THE S WITCH mixing a variety of Baseline and Su perStack units, the smaller units must be positione d at the top. If you are placing Switch un its one on top of the other , you must use the self-adhes ive rubber pads supplied. Apply the pads to the un derside of each Switch, sticking one in th e marked area at each cor- n[...]

Connecting a Network Device 17 If POST fails, try the following: ■ Power of f the Switch, and then pow er it on ag ain. Check the Power LED and see if POST was success- fully completed. ■ Reset the Switch. See “ Resetting to Factory Defaults ” on page 43 . CAUTION: Resetting the Switch to its factory de faults erases all your settings. Y o [...]

18 C HAPTER 2: I NSTALLING THE S WITCH Using SFP T ransceivers The following sections describe how to inser t and remove an SFP transceiver fr om an SFP slot. SFP transceivers are hot-in sertable and hot-swappa- ble. Y ou can remove them from and insert them into any SFP port w ithout having t o power of f the Switch. Approved SFP T ransceivers The[...]

Performing Spot Checks 19 not click when you insert it , remove it, turn it over , and then re-insert it. 3 Remove the plasti c protec tive cover , if fitted. 4 Connect the fiber cable. 5 The transceiver connects to the network using a duplex LC connector . Attach a male duplex LC con- nector on t he network ca ble into the du plex LC con- nector o[...]

20 C HAPTER 2: I NSTALLING THE S WITCH[...]

3 C ONNECTING TO THE W EB I NTERFACE The Switch has a built-in We b interface th at you can use to set the admin password, change the IP addr ess that is assigned to the Switch, and config ure it s advanced settings. If you only want the Switch to function as a b asic layer 2 switch, you do no t need to access the Web interface and configure the Sw[...]

22 C HAPTER 3: C ONNECTING TO THE W EB I NTERFACE Figure 5 Welcome Scr een of Discovery 2 If the computer has multiple network adapters, se lect the adapter that connects the computer to the Switch, an d then click Next . If the computer has only one adapter , click Next . Discovery searches the network for 3 Com devices. When detection is complete[...]

Navigating the W eb Interface 23 Figure 7 Logon Dialog Box T o log on to the Web interface: 1 In User name , type admin . 2 Leave the Password field blank. 3 Click OK . Navigating the We b Interface The Web interface has been designed to enable you to easily perform advanced configur ation tasks and view information about the Switch. Menu The menu [...]

24 C HAPTER 3: C ONNECTING TO THE W EB I NTERFACE Buttons Depending on the scr een that is currentl y displayed, the following buttons may appear: ■ Apply – Click to save and apply a ny changes that you have made ■ Cancel – Click to discar d any unsaved changes ■ Help – Click to display the context-sensitive he lp information for the sc[...]

Accessing the Interface Without Using Discovery 25 DHCP Assigned IP Address If you set the IP address mode to DHCP , check the DHCP server for the IP address that is assigned to the Switch, and th en use that IP addr ess to access th e Web interface. For example, if the DHCP server assigned the IP address 19 2.168.0.123 to the Switch, start your W [...]

26 C HAPTER 3: C ONNECTING TO THE W EB I NTERFACE[...]

4 C ONFIGURING THE S WITCH This chapter provides info rmation on how to config- ure the Switch’ s advanced fe atures. T opics include: ■ Viewing Summary Information ■ Changing the Admin Password ■ Modifying the IP Address Settings ■ Configuring Port Settings ■ Configuring VLANs ■ Configuring T runking ■ Monitoring T raffic ■ Using[...]

28 C HAPTER 4: C ONFIGURING THE S WITCH Figure 9 T op Half of the Summary Screen If you request for technica l as sistance from 3Com Support, you may be asked to print out the informa- tion on this screen. Changing the Admin Password T o prevent unauth orized users from accessing the Web interface and modifying the Switch’ s settings, the interfa[...]

Modifying the IP Address Settings 29 4 In Confirm Password , retype th e passwor d you typed in step 3 to confirm. The password is case-sensitive. 5 Click Apply . If you want to modify t he admin pas sword later on, follow th e same pr ocedur e. If you forget th e administration password after you set it, refer to “ Forgotte n Password ” on pag[...]

30 C HAPTER 4: C ONFIGURING THE S WITCH Setting the IP Address T o se t the IP address for th e Switch: 1 Click IP Settings on the menu. The IP Se ttings screen appears. Figure 11 IP Settings Screen 2 Configure the Switch’ s IP settings. Available options are listed in Ta b l e 9 . Ta b l e 9 IP Setting Options 3 After you configure the Switch’[...]

Configuring Port Settings 31 Configuring Port Settings Using the W eb interface, you can configur e the speed/duplex and flow contr ol settings of each port. Y ou can also view the curr ent connection status of each port or shut down or disab le ports. T wo tabs ar e available on the Port Co nfiguration page: ■ Basic Port Configura tion ■ Advan[...]

32 C HAPTER 4: C ONFIGURING THE S WITCH Switch will automatically connect at 1 000Mbps, pro- viding the connected device also supports thi s speed. 1000Mbps connection s are always full-duplex. Half-duplex connections are only available for 10Mbps and 100Mbps settings. CAUTION: Before manually setting a port to full-duplex, verify t hat th e device[...]

Configuring VLANs 33 networks. This also provid es for a more secur e and cleaner network environment. Y ou can create up t o 256 VLANs, add specific ports to a chosen VLAN (so that th e port can only communi- cate with other ports on the VLAN), or configur e a port make it a member of all VLANs. Communication between dif ferent VLANs can only take[...]

34 C HAPTER 4: C ONFIGURING THE S WITCH Modifying VLANs Use the Modify VLAN scr een to change the VLAN to which a port belongs, and configur e the port to com- municate with all other VLANs, or a selected VLAN. Figure 16 Modify VLANs Scr een ■ Port – Displays the port number ■ Mode – The mode option det ermines if the port can communicate w[...]

Configuring VLANs 35 Setting Up T wo VLANs on the Same Switch Figure 18 illustrates how you can set up a simple VLAN on the Switch using desktop co nnections. Figure 18 Desktop VLAN Configuration If you want to add ports 1, 3, and 26 to VLAN2 (as shown in Figure 18 ), so that the ports on the defa ult VLAN1 and the ports on VL AN2 cannot communicat[...]

36 C HAPTER 4: C ONFIGURING THE S WITCH Figure 19 Uplink VLAN Configurat ion T o set up the configuration shown in Figur e 19 , do the following: 1 Creat e VLAN2 on both Switch 1 and Switch 2, and assign the same name to it. Y ou need not cr eate VLAN1 since it exists by default. 2 On Switch 1, set the ports that you want to be part of VLAN2 to Des[...]

Configuring T runking 37 ■ All ports in a trunk must be configured in an iden- tical manner , including co mmunication mode (that is, speed, duplex mode and flo w control) . Creating, Modifying, and Deleting T runks Use the Modify/Delete tabe under T runking to create, configur e or remo ve ports gr oups fr om trunks. Figure 20 Modify/Delete Scre[...]

38 C HAPTER 4: C ONFIGURING THE S WITCH Figure 22 Summary Screen Monitoring T raffic The Switch allows you to monitor traf f ic going in and out of a pa rticular port. For traffic monitoring to work, you need to attach a network analyze r to one port and use it to monitor the traffic of othe r ports in the stack. T o se t up traffic monito ring, yo[...]

Using the System T ools 39 For information on how to interpr et the output on the port an alyzer , refer to its accompanying docu- mentation. Using the System T ools The System T ools menu includes five administration items: ■ Restart ■ Configuration ■ Upgrade ■ Spanning T ree ■ 802.1p Prioritizatio n Restarting the Switch Pressing the Re[...]

40 C HAPTER 4: C ONFIGURING THE S WITCH ■ T o reload configuration settings that you previ- ously saved to a file, scroll down the page, and then click Browse to locate the backup file on your computer , and then REST ORE to copy the configu- ration back to the Switch. For security purposes, resto ring the configurat ion does not change the passw[...]

Using the System T ools 41 CAUTION: Do not int errupt power to the Switch during the up grade proce dure. If you do , the soft- ware may be co rrupted and the Switch ma y not start up properly afterwar ds. Configuring the Spanning T ree This administrative to ol supports the confi guration of the Switch to forwar d, or block an d discard 802 .1D sp[...]

42 C HAPTER 4: C ONFIGURING THE S WITCH been priority encoded, then the Switch will read the priority level and determine whether the pa cket should be dir ected through t he normal or high prior- ity channel. This feat ure can be useful for example during excessive loads when one type of traf fic may requir e priority ove r another . The Switch is[...]

5 T R OUBLESHOOTING This chapter lists some issues th at you may encounte r while installing, using, and managing the Switch, with suggested cou rses of corr ective action to take. If you encounter an issue th at is not lis ted her e and you cannot solve it, chec k the 3Com Knowledgebase at http://knowledgebase.3com.com befor e contac ting your loc[...]

44 C HAPTER 5: T ROUBLESHOOTING access. See “ Resetting to Factory Defaults ” on page 43 for instructions. After resetting the Switch, log on to the Web inter- face using the default admin acco unt settings: ■ User name – admin ■ Password – blank (no passw ord) Forgotten Static IP Address If you forget th e static IP address that you as[...]

If the Problem Persists 45 The Switch supports full- dup lex autonegotia tion. If the connected device does not sup port autonegotia- tion, ensur e that it is configur ed for half-duplex op er- ation only . If the connected device has autonegotia tion disabled or overridden, and is config- ured as full-duplex, the Sw itch will configure the link as[...]

46 C HAPTER 5: T ROUBLESHOOTING[...]

A O BTAINING S UPPORT FOR Y OUR P R ODUCT Register Y our Product W arranty and other service benefits start from the date of purchase, so it is im portant to register your product quickly to ensure you get full use of the war- ranty and ot her service be nefits available t o you. W arranty and other servic e benefits a re enabled thr ough pr oduct [...]

48 A PPENDIX A: O BTAINING S UPPORT FOR Y OUR P RODUCT found at http://eSupport.3com.c om/ , or under the Pr oduct Support heading at http://www.3com.com/ Software Up grades are the softwar e releases that follow the software version included with your origi- nal prod uct. In order to access upgrades and r elated documentat ion you must first purch[...]

Contact Us 49 . Country T elephon e Number Asia, Pacific Rim T elephon e T echnical Support and Repair Australia Hong Kong India Indonesia Japan Malaysia New Zealand Pakistan Philippines P .R. of Ch ina Singapor e S. Korea Ta i w a n Thailand 1 800 678 515 800 933 486 +61 2 9424 5179 or 000800 6501111 001 803 61 009 00531 616 439 or 03 3507 5984 18[...]

50 A PPENDIX A: O BTAINING S UPPORT FOR Y OUR P RODUCT Antigua Argentina Aruba Bahamas Barbados Belize Bermuda Bonair e Brazil Cayman Chile Colombia Costa Rica Curacao Ecuador Dominican Republi c Guatemala Haiti Honduras Jamaica Martinique Mexico Nicaragua Panama Paraguay Peru Puerto Rico Salvador T rinidad and T obago Uruguay Ve n ez u e l a Virgi[...]

B S AFETY I NFORMATION Important Safety Information Please read the following sa fety information carefully before installing the 3Com Baseline Switch 2250 Plus. WAR N I NG : Installation and removal of the unit must be carried out by qualified personnel on ly . ■ If installing the Switch un it in a stack with other units, the Switch unit mu st b[...]

52 A PPENDIX B: S AFETY I NFORMATION Power Cord Set This must be approved fo r the country wher e it will be used. WAR NIN G : Fiber Optic Ports – Optical Safet y Never look at the transmit laser while it is powered on. Never look directly at the f iber ports and fib er cable ends when they are powered on. WAR NIN G : Use of controls or adjustmen[...]

Consignes Importantes de Sécurité 53 ■ La prise secteur doit se tr ouver à pr oximité de l’appareil et son accès doit êtr e facile. V ous ne pouvez mettre l’appareil hor s circuit qu ’en débran- chant son cordon électrique au niveau de cette prise. ■ L ’appareil fonctionne à une tension extrêmement basse de sécurité qui est [...]

54 A PPENDIX B: S AFETY I NFORMATION A VERTI SSEMENT : Ports pour fibres opt iques – sécu- rité sur le plan optique Ne regardez jamais le laser tant qu'il e st sous tension. Ne regardez jamais directement le port à fibres optiques et les embo uts de câbles à fibres optiques tant qu'ils sont sous tension. A VERTI SSEMENT : L'ut[...]

Wichtige Sicherheitshinweise Info rmationen 55 WARNUNG: Die Installation und der Ausbau des Geräts darf nur durch Fachperso nal erfolgen. Niemals ein Übertragungslaser betrachten, während dieses eingeschaltet ist. Niemals dire kt auf die Faser- ansnchlüsse und auf die Fa serkabelenden schauen, während die se eingeschalt et sind. WARNUNG: Die V[...]

56 A PPENDIX B: S AFETY I NFORMATION[...]

C T ECHNICAL I NFORMATION Related Standards The 3Com Baseline Switch 2250 Plus has been designed to the followi ng standar ds: Environmental Physical Electrical Functional ISO 8802-3, IEEE 802.3 (Ethernet), IEEE 802.3u (Fast Ethernet), IEEE 802.3ab (Gigabit Ethernet), IEEE 802.3x (Flow Contr ol), IEEE 802 .1D 1998 (Bridging) MAC Addr ess 8192 Safet[...]

58 A PPENDIX C: T ECHNICAL I NFORMAT ION[...]

G LOSSARY 10BASE- T The IEEE specification for 10 Mbps Ethernet over Cat- egory 3, 4 or 5 twisted pair cable. 100BASE- TX The IEEE specification for 100 Mbps Fast Ethernet over Category 5 tw isted-pair cable. 1000BASE-LX IEEE 802.3z specification fo r Gigabit Ethernet over 9/125 micr on cor e single-mode f iber cable. 1000BASE-SX IEEE 802.3z specif[...]

60 G LOSSARY category 5e cables One of five grades of T wisted Pair (TP) cabling defined by the EIA/TIA-568 standar d. Category 5e can be used in Ethernet (10BAS E-T), Fast Ether net (100BASE-TX) and Gigabit Ether net (1000BASE-T) networks, and can tr ansmit data at speeds of up to 1000 Mbps. category 6 cable One of five grades of T wisted Pair (TP[...]

G LOSSARY 61 standard way for VLANs to communicate acr oss switched networks. IEEE 802.1 p An IEEE standa rd for prov id ing quality of service (QoS) in Ethe rnet networks. The st andard uses packet tags that define up to eight traffic classes and allow s switches to tr ansmit packets based on the t agged pri- ority value. IEEE 802.3ad A standard t[...]

62 G LOSSARY network A network is a collection of computers and other computer equipmen t that are connected for the pu r- pose of exchanging infor mation or sharing r esour ces. Networks vary in size, som e are within a single room, others span cont inents. ping Packet Inter net Groper . An inter net utility used to determine whether a particular [...]

G LOSSARY 63 TCP relates to the content of the data travelling through a network — ensuring th at the inf ormation sent arriv es in one piec e wh en it reaches its destina- tion. IP r elates to the addr ess of the end station to which data is being sent, as well as the addr ess of the destination network. traffic monitoring Enables the monitorin [...]

64 G LOSSARY[...]

I NDEX Numbers 1000BASE-LX 59 1000BASE-SX 59 1000BASE-T 59 100BASE-TX 59 10BASE-T 59 A auto IP confi guration 29 default IP address 29 default mask 29 autonegotiati on 7 autosensing 7 B bandwidth 59 C client 60 configuration overview 27 connecting network device 17 SFP transceivers 18 conventions notice icons, About This Guide 5 text, About T his G[...]

66 I NDEX changing 28 default (blan k) 28 setting 28 physical features 9 port settings configuring 31 default settings 32 ports RJ-45 11 SFP 8, 10 positioning 13 POST 16 powering on 16 power -on self-test See POST protocol defined 62 R rack-mounting 14 rear p anel power supply 12 Recovery button 12 resetting to factory defaults 43 RJ-45 defined 62 [...]

R EGULATORY N OTICES FCC S TATEMENT This equipment has been tested and found to comply with the limits for a Class A digital device, pursu ant to part 1 5 of the FCC rul es. These limit s are designed to provide reasonable protection against harmful interfere nce when the equipment is operated in a commercial environment. This equipment generates, [...]