Manuale d’uso / di manutenzione del prodotto VH-2402S del fabbricante Enterasys Networks
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9033645 -01 V ERTICAL HORIZON VH-240 2S F AST ETHERNET SWITCH MAN AGEM ENT GU IDE.
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Notice 9033645-01 i NOTICE Enterasys Networ ks reserves the right to make chan ges in specifications and other in formation contai ned in this docume nt without pri or notice. The reader should in all ca ses consult Ent erasys Networks to d etermine whet her any such chang es have been made.
Notice ii 9033645-01.
9033645-01 Table of Content s iii TABLE OF CONTENTS 1. MANAGEMENT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Configura tion Opti ons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv Ta ble o f Cont ents VH-240 2S Display ing the Uni cast Addre ss Table . . . . . . . . . . . . . . . . . . . . . 62 Display ing the IP M ulticast Reg istration Table . . . . . . . . . . . . . . . 63 Configuri ng Stati c Unicast Add resses . . . . .
9033645-01 Table of Conte nts v Remappi ng Network To pology . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 APPENDIX B. VIRTUAL LANS (VLANS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 VLANs and Frame T agging . . . . . . . .
vi Ta ble o f Cont ents VH-240 2S.
9033645-01 Manage ment Over view 1 1. MANAGEMENT OVERVIEW Configuration Options For adva nced man ageme nt capab ility, the VH-SMG MT Vertic al Horiz on Manage ment M odule pro vides a menu-d riven syste m config uration progra m.
2 Management Over view VH-240 2S When attac hing to a PC, set term inal emul ation type to VT100, sp ecify the port used by your PC (i.e., COM 1~4), an d then set com municat ions to 8 data bit s, 1 s top bit, no parity , and 1 9200 bps (for ini tial confi gurati on).
9033645-01 Manage ment Over view 3 In-Band Network Connection The on-b oard c onfigu ration pro gram can be ac cessed usin g Telnet from any com puter atta ched to th e network. Th e swit ch and st ack can als o be manage d by any com puter usin g a Web brow ser (Inter net Explorer 4 .
4 Management Over view VH-240 2S.
9033645-01 VH-2402S User Inte rface 5 2. VH-2402S USER INTERFACE Over view Access is gain ed to th e consol e men us by co nnect ing a term inal to the consol e port (wi th a direc t cable c onnectio n or ov er modems), or using Telnet to acce ss the M anage ment Mod ule over th e netwo rk.
6 VH-24 02S User Interface VH-240 2S User Ac cess Once a direct c onnection to the serial po rt or a Te lnet con nectio n is establi shed, the login screen fo r the on -board con figurat ion program appears . You may need to press Enter a few tim es to displ ay the screen.
9033645-01 VH-2402S User Inte rface 7 Factory Defaults Table 2-1 list s the d efault se ttings for switch config uration paramete rs. Each para meter can be ch anged via th e consol e menus or Teln et.
8 VH-24 02S User Interface VH-240 2S Virtual LANs Acceptable VLA N Frame Type All Configurable PVID Tagging Yes GVRP Disabled Untagged VLAN Group Assignment 1 VLAN Ingress Filtering False VLAN Learnin.
9033645-01 VH-2402S User Inte rface 9 Main Menu The Main Menu i s the first s creen seen after succ essfu lly loggi ng into t he system . Figure 2 -2 sho ws the Mai n Menu an d the a ccompan ying tabl e desc ribes t he Mai n Menu . Figure 2-2. M ain Menu V ertical Ho rizon L ocal Manag ement -- VH-2402S Main M enu System Info rmation Menu .
10 VH-2 402S User Interface VH-240 2S Device Control Menu Port Configuration Enables any port, enables/disables flow control, and sets communication m ode to auto-negotiation, full duplex or half duplex. Port Information Displays operational status, including link state , flow control method, and dup lex mode.
9033645-01 VH-240 2S User In terface 11 System Informa tion Menu Use th e System Informatio n Men u to disp lay a bas ic de scription of the switch, includin g cont act inform ation, and hardw are/firmwa re version s.
12 VH-2 402S User Interface VH-240 2S Displaying System Infor mation Use th e System Informatio n screen to displa y des criptive informati on about th e switc h, or for quick s ystem id entifi cation as shown in the follow ing figure and ta ble. Figu re 2- 4.
9033645-01 VH-240 2S User In terface 13 Displaying Switch Version and Module Information Use t he Switch I nforma tion screen to dis play ha rdware/fir mware vers ion numbers for the ma in boa rd and agent mod ule, as w ell as the powe r status and mo dules pl ugged into the s ystem.
14 VH-2 402S User Interface VH-240 2S Management Setup Menu After init ially logging o nto the system , adju st the com munica tion paramet ers for you r cons ole to ens ure a r eliable c onnectio n (Serial Port Config uration).
9033645-01 VH-240 2S User In terface 15 Changing the Network Configuration Use t he Network Confi guration m enu t o set the bootu p option, configure the sw itch’s Inte rnet Protoc ol (I P) parame ters, ena ble the on-bo ard W eb Agent, or t o set t he numbe r of concu rrent Tel net sess ions all owed.
16 VH-2 402S User Interface VH-240 2S IP Configuration Use the IP Configu ration scre en to se t the bootup o ption, o r config ure the switch’ s IP para meters.
9033645-01 VH-240 2S User In terface 17 IP Connectivity Te st (Ping) Use the IP Conn ectivity Test to see if another si te on the Inte rnet can be reached .
18 VH-2 402S User Interface VH-240 2S HTTP Configuration Use the HTT P Config uration screen to e nable/di sable the on-b oard Web agent, a nd to s pecify th e TCP port that w ill prov ide HTTP s ervice. The screen shown b elow is describ ed in t he foll owing ta ble.
9033645-01 VH-240 2S User In terface 19 Configuring th e Serial Po rt You can ac cess the on-board configu ration pr ogram by att aching a VT1 00 compat ible dev ice to the switch ’s seria l port. (F or more in formation on connec ting to thi s port, see “Re quired C onnection s” on page 1.
20 VH-2 402S User Interface VH-240 2S Assign ing SNMP Para mete rs Use the SNMP Configura tion scree n to displ ay and modify pa ramete rs for the Simpl e Networ k Managem ent Protoco l (SNMP). The s witch incl udes an on- boar d SNMP agent which m onit ors th e stat us of i ts har dware , as well as the traff ic passi ng through its p orts.
9033645-01 VH-240 2S User In terface 21 Configuring Com munity Names The f ollowin g figure an d tabl e describ e how to confi gure the commun ity strings authorize d for mana gemen t acces s.
22 VH-2 402S User Interface VH-240 2S Configuring IP T rap Man agers The f ollowin g figure an d tabl e desc ribe how to spec ify ma nagemen t station s that will receive auth entic ation fail ure message s or other trap messa ges from t he swit ch. U p to 5 trap manag ers may be ente red.
9033645-01 VH-240 2S User In terface 23 Console Login Configuration Use the M anage ment Setup : Conso le Login C onfigura tion to restrict manage ment a ccess based on specif ied us er names and passwor ds, or to set the invalid passwo rd thresh old and timeout.
24 VH-2 402S User Interface VH-240 2S Download ing System S oftware Using TFTP Proto col to Downlo ad Over the Netw ork Use the TFTP Downl oad menu to lo ad software updat es into t he swi tch. The down load file sh ould be an VH-2402S file from Entera sys; otherwi se the agen t will n ot accep t it.
9033645-01 VH-240 2S User In terface 25 Saving t he System Co nfiguration Use th e Configura tion Sav e & Res tore menu to save th e switc h configu ration settin gs to a fil e on a TFT P serve r. The fi le ca n be later downl oaded to t he switch to res tore the switch’ s settings .
26 VH-2 402S User Interface VH-240 2S Configuring Management Ac cess Use th e Manage ment Co nfigurat ion menu to def ine whi ch VLAN has manage ment acc ess to the switch. Paramete rs shown on this scre en are indica ted in the followi ng figure and tabl e.
9033645-01 VH-240 2S User In terface 27 Configuring the Switch The De vice C ontrol men u is u sed to co ntrol a broad rang e of fun ction s, includ ing port c onfigu ration, Span ning T ree suppor t for redu ndant switche s, port mirrori ng, multic ast filteri ng, and Virtual LANs.
28 VH-2 402S User Interface VH-240 2S 802.1Q VLAN Base Inf ormation Displays basic VLAN informa tion, such as VLAN version number and maximum VLANs suppor ted.
9033645-01 VH-240 2S User In terface 29 Configuring P ort Paramet ers Use th e Port Con figurat ion menu s to s et or di splay co mmunic ation paramete rs for any port or module o n the sw itch.
30 VH-2 402S User Interface VH-240 2S Viewing the Current Port Configuration The Port In formation s creen displays th e port type , statu s, link state , and flow c ontrol in use , as we ll as th e com munica tion spe ed and dupl ex mode . To cha nge any of th e port settings , use t he Port Config uration m enu.
9033645-01 VH-240 2S User In terface 31 Using the Spanning Tree Algorit hm The Spann ing Tre e Algorithm can be us ed to d etect and d isable n etwork loops, a nd to p rovide backup l inks between switch es, bridge s or rou ters.
32 VH-2 402S User Interface VH-240 2S Parameter Default Description Spanning Tree Protocol Enabled Enable this parameter to par ticipate in an STA compliant network. Priority 32,768 Device priority is used in selecti ng the root device, root port, and designated port.
9033645-01 VH-240 2S User In terface 33 Configuring STA fo r Ports or Mo dules The foll owing fi gure an d table de scrib e STA co nfiguratio n for po rts or module s. (Note that the Spanning Tree Conf igurati on screen for the expans ion s lots also indic ates mo dule ty pe.
34 VH-2 402S User Interface VH-240 2S Viewing the Current Spanning Tre e Configuration The Spann ing Tre e Informat ion scree n dis plays a s ummary of the S TA infor mation for the ov erall bridge or for a sp ecific port or module. To ma ke any cha nges to the param eters for the Spann ing Tre e, use the S pannin g Tree Co nfigura tion menu .
9033645-01 VH-240 2S User In terface 35 Disp layi ng the Curr ent Br idge S TA The param eters shown i n the foll owing fi gure a nd tabl e describ e the current Bri dge STA Info rmation.
36 VH-2 402S User Interface VH-240 2S Displaying the Current STA for Ports or Modules The param eters sh own in t he foll owing fi gure and t able a re for po rt or module STA In format ion (Port 1-12 , Port 13-24 , Port 25-3 2).
9033645-01 VH-240 2S User In terface 37 The rules defining port status are: • A port on a network seg ment with no other STA-com pliant bridging device is always forwarding.
38 VH-2 402S User Interface VH-240 2S Using a Mirror Port for Analy sis You can mirror tr affic fr om any sourc e port to a tar get port for real-tim e analys is. You c an then attach a logic analyze r or RMO N probe t o the target po rt and s tudy t he traffic crossing the s ource port in a co mpletely unobtrus ive man ner.
9033645-01 VH-240 2S User In terface 39 Configuring P ort Trunks Port trunk s can be used t o increas e the band width of a netwo rk connec tion or to ensure fault reco very. You can co nfigure up five trunk connec tions (co mbining 2~4 po rts into a fat pipe ) betwee n any two standal one VH-24 02S swit ches, or up to 12 for an en tire st ack.
40 VH-2 402S User Interface VH-240 2S You can use the Port Trunking C onfigur ation scre en set up port trunk s as shown below: Figure 2-29. Port Trunki ng Configuration The RJ -45 ports u sed fo r each trun k mus t all be on the same internal switch c hip.
9033645-01 VH-240 2S User In terface 41 IGMP Multicast Filter ing Multic asting is used to suppo rt real-ti me appli catio ns su ch as vi deo conferen cing or strea ming audio. A multicast serve r does not have to establi sh a separa te conn ection w ith each c lient.
42 VH-2 402S User Interface VH-240 2S Configuring IG MP This prot ocol a llow s a ho st to info rm it s loc al s witch/ rout er th at it want s to receive trans mission s addr essed to a specif ic mu lticast g roup. Yo u can use the I GMP Con figurat ion screen to con figure mul ticast fil tering shown below : Figure 2- 30.
9033645-01 VH-240 2S User In terface 43 Configuring Broad cast Storm Control Use the Bro adcas t Storm Cont rol Confi guratio n screen to enable broa dcast storm contro l for any por t on the switch , as s hown be low: Figure 2-31 .
44 VH-2 402S User Interface VH-240 2S Configuring Bridge MIB Exten sions The Bridg e MIB in cludes extens ions for m anag ed devic es that support Traffi c Classes , Multic ast Fi ltering an d Virtua l LANs. T o configu re thes e extens ions, use the Exten ded Brid ge Confi guratio n screen as shown below : Figure 2-32.
9033645-01 VH-240 2S User In terface 45 Bridge Settings Traffic Class* Multiple traffic classe s are supported by this switch as indicated under Bridge Capabilities.
46 VH-2 402S User Interface VH-240 2S Configuring Traffic Classes IEEE 802 .1p defin es up to 8 se parate traff ic cl asses. T his s witch supp orts Qualit y of Servic e (Qo S) by usin g two pri ority queu es, with weight ed fair queuing for eac h port.
9033645-01 VH-240 2S User In terface 47 Port Priority Configuration The defa ult prio rity for al l ingre ss ports is zero. T herefore , any inb ound frames that do not have priority ta gs will be pla ced in th e low pri ority output que ue.
48 VH-2 402S User Interface VH-240 2S 802.1P Por t Traffic Class Inf ormation This sw itch pro vides tw o prio rity level s with we ighted fair qu euing f or port egre ss.
9033645-01 VH-240 2S User In terface 49 Configuring Virtual LANs You can use the VL AN config uratio n menu to assig n any por t on the switch t o any o f up to 256 LAN groups. In conve ntional n etwor ks with router s, broadc ast traf fic is s plit up in to sep arate doma ins.
50 VH-2 402S User Interface VH-240 2S 802.1Q VLAN Curren t Table In formation This sc reen show s the current po rt members of each VLAN an d whether or not the port s upports VLAN taggin g. Ports as signed to a large VLAN group that cros ses several s witche s shoul d use VLAN tagg ing.
9033645-01 VH-240 2S User In terface 51 802.1Q VLAN Static Table Configuration Use this screen to create a new VLAN or modify th e setting s for an existing V LAN. You c an add /delete po rt members fo r a VLAN fro m any unit in the sta ck, or pre vent a port from b eing a utomatic ally adde d to a VLAN via the G VRP proto col.
52 VH-2 402S User Interface VH-240 2S For exam ple, the f ollowin g screen display s setting s for VLAN 2, which includ es tagged ports 1 -6, and forb idden port 12 . (Note th at the das hed lines s how that the re are no s witch units in this syst em other tha n Unit 1.
9033645-01 VH-240 2S User In terface 53 Port Assignment VLAN Co nfiguration Use this screen to configure port-spec ific settin gs for IEEE 802.1Q VL AN features . Figure 2-40. Port Assignmen t VLAN Configura tion V ertical Ho rizon L ocal Manag ement -- VH-2402S Port Assi gnment VLA N Config uration Unit Port PVID 802.
54 VH-2 402S User Interface VH-240 2S Multicast Router Port Information You can use the M ultic ast Rout er Port Inform ation sc reen to display the ports on this switc h atta ched to a neighb oring mul ticast ro uter/sw itch for each VLAN ID. Figure 2-41 .
9033645-01 VH-240 2S User In terface 55 Static Multicast Router Port Configuration You can use the Sta tic M ulticast R outer Por t Configu ration screen to assign ports tha t are att ached to a neigh boring multi cast route r/switc h.
56 VH-2 402S User Interface VH-240 2S IGMP Member Po rt Configuration You can use the IGMP Me mber Po rt Config uration sc reen to as sign p orts that ar e attache d to hosts who want t o receive a specifi c multic ast serv ice.
9033645-01 VH-240 2S User In terface 57 Port S ecurity Configuration Use the Po rt Securi ty Conf igurati on screen to enable and c onfigur e port securit y for the switch . Port Security allo ws you to configu re each port with a list o f MAC addresse s of d evices that are authori zed to ac cess the network th rough t hat port .
58 VH-2 402S User Interface VH-240 2S Monitoring the Switch The Network Monitor M enu prov ides acces s to port s tatist ics, RMON statist ics, IP mu ltica st addres ses, and the static (unicas t) addre ss table. Each of th e scre ens provi ded by these me nus i s describ ed in t he foll owing secti ons.
9033645-01 VH-240 2S User In terface 59 Displaying Port Stat istics Port Statis tics dis play key stat istics fr om the Ethernet-lik e MIB for each port.
60 VH-2 402S User Interface VH-240 2S Displaying RMON Stat istics Use th e RMON Stati stics screen to d ispla y key s tatist ics f or each por t or media m odule fro m RMON gro up 1. (R MON grou ps 2, 3 an d 9 ca n only be acc essed us ing SNM P managem ent softw are.
9033645-01 VH-240 2S User In terface 61 Parameter Description Drop Event s The t otal number of events in which pack ets were dropped due to lack of res ources. Received Bytes Total number of by tes of data received on the network. T his statistic can be used as a reasonable indication of Ethernet utilization.
62 VH-2 402S User Interface VH-240 2S Displaying the Unicast Ad dress Table The Addre ss Table contai ns the M AC addres ses and VLAN identifi er associat ed with e ach port (t hat is, the source p ort assoc iated with the address and VLAN), so rted by MAC address or VLAN ID.
9033645-01 VH-240 2S User In terface 63 Displaying the IP Mul ticast Registrat ion Table Use t he IP Mul ticast R egistra tion T able t o displa y al l the multicas t groups active on thi s switch, includin g multic ast IP a ddresses an d the correspond ing VLAN I D.
64 VH-2 402S User Interface VH-240 2S Configuring Static Unicast Addresses Use th e Static Uni cast Addre ss Table Configu ration screen to manu ally configu re hos t MAC add resses i n the unic ast tabl e. You can use th is screen to assoc iate a MAC address with a specific VLAN ID an d switc h port as show n below .
9033645-01 VH-240 2S User In terface 65 Resetti ng the Sy stem Select th e System Restart Menu und er the Mai n Menu to reset the manage ment a gent. The re set s creen inc ludes op tions as show n in the follow ing figure and ta ble.
66 VH-2 402S User Interface VH-240 2S.
9033645-01 Configuring & Monitoring th e Switch 67 3. CONFIGURING & MONIT ORING THE SWITCH Common Tasks The sw itch con sole menus al low you to mo dify d efault sw itch settings and configu re the s witch for networ k man agement. They a lso allow you to monitor switch perform ance and s tatus.
68 Con figuring & Monitoring the Switch VH-240 2S Setting Password Protec tion The VH-2 402S switc h is fact ory-con figured with ad ministra tor acces s rights to the c onsole m enus set to REA D/WRITE. This sett ing al lows anyone to use the cons ole menu s to m odify any opera tional pa rameter .
9033645-01 Configuring & Monitoring th e Switch 69 Assigning an IP Address To assi gn an IP address to the switch, do the followi ng: 1. Se lect Man agement Se tup Me nu from th e Main menu. 2. Se lect Netw ork Conf iguration and the n IP Confi guration.
70 Con figuring & Monitoring the Switch VH-240 2S Setting SNMP Management Access Access to the VH-24 02S switc h through SNMP is controlle d by commun ity n ames. T he commun ity n ames s et for t he swit ch mus t match those u sed by th e SNMP m anagemen t station for succe ssful commun icati on to oc cur.
9033645-01 Configuring & Monitoring th e Switch 71 Configuring Port Mirroring You can mirror th e traffic b eing s witched o n any port for t he purpos es of network tra ffic a nalysis and conn ectio n assuran ce. When P ort Mirrorin g is enab led, o ne port bec omes a monito r port for an y othe r port wi thin the stack.
72 Con figuring & Monitoring the Switch VH-240 2S Downlo ading Via t he Serial P ort A serial dow nload is the ea siest method to upgrad e the VH-2402S sw itch softwa re, requirin g the l east amo unt of equipmen t and con figurati on. To dow nload sw itch software via the s erial port, do the follo wing: 1.
9033645-01 Configuring & Monitoring th e Switch 73 server a nd the nam e of th e upgrade file. T o program t he swit ch IP address , sele ct the Ma nagem ent Setu p Menu fro m the Ma in Men u screen, then sel ect Netw ork Co nfigura tion. To dow nload switch software via T FTP, do the f ollowin g: 1.
74 Con figuring & Monitoring the Switch VH-240 2S Configuring Spanning Tree Param eters The VH-2 402S switc h supports the IEE E 802.1D Spanning T ree P rotocol. This pro tocol allows red undant conne ctions to be create d betwee n LAN segmen ts for purp oses of fault tol erance.
9033645-01 Configuring & Monitoring th e Switch 75 Configuring VLANs A virtual LAN (VLAN) is a grou p of devices on one or more LANs th at are configu red su ch tha t they can commun icate as if the y were attac hed to the sa me wire . Becaus e VLA Ns are ba sed on logical inste ad of ph ysica l connec tions, the y are e xtremely flexibl e.
76 Con figuring & Monitoring the Switch VH-240 2S Configuring Port Operation You can config ure swi tch ports for opera tional paramete rs such a s auto- negotia tion, du plex mode , port speed a nd flow co ntrol. The 100Base-FX fiber ports alw ays ope rate in full dupl ex mode and 10 0Mbps s peed.
9033645-01 Configuring & Monitoring th e Switch 77 Configuring the Unicast Address Table The Un icast Add ress Table all ows yo u to de signate forwardin g treatm ent through the sw itch for spec ific MAC add resses, all owing you to main tain the ef ficie ncy and securi ty of yo ur netw ork.
78 Con figuring & Monitoring the Switch VH-240 2S Setting a Default Gateway The defa ult Gate way pa rameter d efines th e IP ad dress of a router or othe r network device to whic h IP pac kets are to be se nt if des tined for a subn et outside of tha t which the swi tch is op erating .
9033645-01 Configuring & Monitoring th e Switch 79 Configuring Port Trunks You can config ure up to f ive po rt trunks o n a sta ndalone VH- 2402S switch, or up to 12 for an e ntire stac k. Eac h trunk c an combi ne two, t hree, or fou r ports, cre ating an agg regate band width o f up to 4 Gbps whe n group ing gigabi t ports.
80 Con figuring & Monitoring the Switch VH-240 2S.
9033645-01 SNMP Managem ent 81 4. SNMP MANAGEMENT The SNMP Protocol SNMP (Simpl e Netw ork Mana gement Prot ocol) is a commu nication proto col desi gned spec ificall y for th e purpose of manag ing dev ices or other elements on a n etwork.
82 SNMP Manage ment VH-240 2S There are three mai n opera tions defi ned in SNM P: • GET ope rations read in format ion from the mana ged d evice, s uch as those u sed to obtain st atus o r statis tical da ta.
9033645-01 SNMP Managem ent 83 RFC 1213 (M IB-II) RFC 121 3 provi des man ageme nt of sys tem-leve l paramete rs, inc luding TCP/I P prot ocol- rel ated s tatis tics, IP addr essi ng, an d inte rfac e stat isti cs for each switc h port. M IB-II is th e standard MIB d efined b y RFC 12 13.
84 SNMP Manage ment VH-240 2S RFC 1757 (RMO N MIB) RFC 175 7 is a gro up defi ned under MIB-II. Th is MIB pro vides manage ment f or the RMO N aspects of the switch . The VH-2 402S switc h supports four of the nine gro ups of R MON define d for Ethe rnet netw orks on a per port basis.
9033645-01 Spanning Tree Con cepts 85 APPENDIX A. SPANNIN G TREE CONCEPTS General The IEEE 80 2.1D Span ning Tr ee Protocol resolve s the probl ems of physic al loops in a netwo rk by establis hing one primary path between any two swi tches in a netw ork.
86 Spa nning Tre e Concepts VH-240 2S Spanning Tree Protocol in a Network Figure A-1 illu strates t he us e of three VH-2402S swi tches to establi sh an effectiv e Span ning Tr ee config uration . Switches A , B and C a re connec ted togethe r in a re dundan t topology (more than one pa th betwee n two po ints).
9033645-01 Spanning Tree Con cepts 87 Spanning Tree Protocol Pa rameters Several c onfig uration pa ramete rs control the operati on of t he Span ning Tree Pr otocol. Ta ble A-1 describes the param eters and lists th e VH-2402S swi tch de fault sett ings for e ach param eter.
88 Spa nning Tre e Concepts VH-240 2S Spanning Tree Protocol Ope ration When the Spanni ng Tree Proto col is e nabled fo r the first t ime or when there is a c hange in the networ k topology , such a .
9033645-01 Spanning Tree Con cepts 89 There are five (5) s tates that the port s can be in for spa nning tree: • Block ing: A po rt in this state does not part icipat e in the transm issi on of frames , thus preve nting du plicatio n arisin g through mu ltiple paths existi ng in t he active topology of the bridge d LAN.
90 Spa nning Tre e Concepts VH-240 2S.
9033645-01 Virtual LANs (VLANs) 91 APPENDIX B. VIRTU AL LANS (VLANS) VLANs and Frame Tagging The VH-2402 S switch s upports IEEE 802.1Q-compli ant virtua l LANs (VLANs).
VH-2402S V LAN Configuration VLAN ope ration on the VH-240 2S is ena bled by d efault. Therefore, a ll frames are transferred internal ly through the switch with a VLAN tag. This tag may already be on t he fram e enteri ng the sw itch, or added to the frame by the switc h.
9033645-01 Virtual LANs (VLANs) 93 Forwarding Tagged/Untagged Frames Ports can be assig ned to m ultiple t agged o r untag ged VLANs. Eac h port on t he swi tch i s therefore cap able of passi ng tag ged or untagge d fr ames.
94 Virtual LANs (VLANs) VH-2402S Forwarding Tra ffic with Unknown VLAN Tags This swi tch on ly suppo rts 256 VLAN s with VL AN IDs ranging fro m 1 to 2048, b ut the I EEE 802.
9033645-01 Class of Service 95 APPENDIX C. CLASS OF SERVICE Class o f Servic e support on the VH -2402S allo ws you to assig n missi on- critica l data a h igher p riority thro ugh the switch by dela ying les s critic al traffic d uring p eriods of congesti on.
96 Class of Service VH-240 2S Figure C -1 sh ows prio rity queui ng ope rating w ithin a s witch. Fr ames enter ing the sw itch th rough p orts 1 and 4 are ta gged as normal traffic an d placed in a normal priority que ue on the ou tbound port.
9033645-01 IP Multicast Filtering 97 APPENDIX D. IP M ULTICAST FILTERING IGMP Snooping and IP Multicast Filtering The Intern et Gro up Manag ement Protocol (IGM P) runs betw een hos ts and their im media tely neighb oring mu lticast rout er/switch.
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9033645-01 Index 1 INDEX A address table unicast, 62 aging time, configuring, 77 Auto-negotiation, configuring, 76 B BootP, configuring, 78 bridge MIB extensions, 44 C Class of Ser vice, configuring, .
2 Index VH-240 2S priority port configuration, 47 port information, 48 tr affi c cl ass , 46 R restarting the sy stem, 65 S serial port configuration, 19 connections, 1 download, 71 SET operations, 82.
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150524-103 R02.
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 Enterasys Networks VH-2402S 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 Enterasys Networks VH-2402S - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Enterasys Networks VH-2402S imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Enterasys Networks VH-2402S ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Enterasys Networks VH-2402S, 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 Enterasys Networks VH-2402S.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Enterasys Networks VH-2402S. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Enterasys Networks VH-2402S 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.
