Enterasys NetworksメーカーVH-8Gの使用説明書/サービス説明書
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9033640 V ERTICAL HORIZON VH-8G GIGABIT ETHERNET SWITCH MAN AGEM ENT G UID E.
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Notice 9033640 i NOTICE Enterasys Networ ks reserves the right to make c hanges in specificatio ns and other informa tion contai ned in this docum ent wit hout prior noti ce. The reade r should in all ca ses consult Ent erasys Networks to d etermine w hether any such changes have been ma de.
Notice ii 9033640.
9033640 Table of Content s iii TABLE OF CONTENTS 1. MANAGEMENT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Configura tion Opti ons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv Ta ble o f Cont ents VH-8G Display ing the IP M ulticast Reg istration Table . . . . . . . . . . . . . . . 61 Configuri ng Stati c Unicast Add resses . . . . . . . . . . . . . . . . . . . . . . 62 Resettin g the Syste m . . . . . . . . . . . . . . .
9033640 Table of Conte nts v APPENDIX B. VIRTUAL LANS (VLANS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 VLANs and Frame T agging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 VH-8G VLAN Con figuration . . . . .
vi Ta ble o f Cont ents VH-8G.
9033640 Manage ment O verview 1 1. MANAGEMENT OVERVIEW Configuration Options For a dvanc ed ma nagem ent capa bilit y, th e En tera sys Ne twork s’ V erti cal Horizo n VH-8G provides a menu-dri ven s ystem con figurati on prog ram.
2 Management Over view VH-8G In-Band Connections Prior to ac cessin g the s witch via a netwo rk connec tion, you must first configu re it w ith a va lid IP a ddress, s ubnet mas k, and d efault g ateway usin g an ou t-of -ban d co nnect ion or the Boot P pro toco l.
9033640 VH-8G Us er Inte rface 3 2. VH-8G USER INTERFACE Over view Access is gain ed to the cons ole men us by direct ly connec ting a termin al to the c onsol e port wi th a null-m odem ca ble co nnect ion, or us ing Tel net to acce ss th e switch o ver the network .
4 VH-8G User Int erface VH-8G User Ac cess Once a direct c onnection to the console port or a Telnet connec tion is establi shed, the login screen fo r the on -board con figurat ion program appears . You may ne ed to pre ss Enter a fe w times to di splay the scree n.
9033640 VH-8G Us er Inte rface 5 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.
6 VH-8G User Int erface VH-8G Virtual LANs Acceptable VLA N Frame Type All Configurable PVID Tagging Yes GVRP Disabled Untagged VLAN Group Assignment 1 VLAN Ingress Filtering False VLAN Learning SVL P.
9033640 VH-8G Us er Inte rface 7 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 ribe s the Ma in Men u. Figure 2-2. M ain Menu V ertical Hor izon Loca l Mana gement -- VH-8 G Main M enu System Info rmatio n Menu.
8 VH-8G User Int erface VH-8G 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.
9033640 VH-8G Us er Inte rface 9 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.
10 VH-8 G User Inter face VH-8G Displaying System In formation 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.
9033640 VH-8G Use r Interface 11 Displaying Switch Version Use t he Switch I nforma tion screen to dis play ha rdware/fir mware vers ion numbers for the sw itch , as well a s the power st atus o f the sys tem. Figure 2-5 . Switch Info rmation V ertical Hor izon Loca l Mana gement -- VH-8 G Switch Infor mation Main Bo ard Hardware V ersion : V0.
12 VH-8 G User Inter face VH-8G 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 Configura tion).
9033640 VH-8G Use r Interface 13 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 server, or to set th e numb er of conc urrent T elnet ses sions a llowed.
14 VH-8 G User Inter face VH-8G 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.
9033640 VH-8G Use r Interface 15 IP Connectivity Te st (Ping) Use the IP Conn ectivity Test to see if another si te on the Inte rnet can be reached . The s creen sho wn belo w is de scribed i n the f ollowin g table.
16 VH-8 G User Inter face VH-8G HTTP Configuration Use the HTT P Config uration screen to e nable/di sable the on-b oard Web server, and to spe cify the TCP port th at will provid e HTTP se rvice. Th e screen shown b elow is describ ed in t he foll owing ta ble.
9033640 VH-8G Use r Interface 17 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.
18 VH-8 G User Inter face VH-8G 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 SNMP a gent which m onitors the s tatus of its hardware, as w ell as the traffic p assing t hrough its po rts.
9033640 VH-8G Use r Interface 19 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.
20 VH-8 G User Inter face VH-8G 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.
9033640 VH-8G Use r Interface 21 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.
22 VH-8 G User Inter face VH-8G 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 dow nload fil e should be an VH-8 G file from Entera sys; otherwise th e switch will not accept it.
9033640 VH-8G Use r Interface 23 Saving t he System Configurat ion 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 .
24 VH-8 G User Inter face VH-8G Configuring Management Access 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.
9033640 VH-8G Use r Interface 25 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.
26 VH-8 G User Inter face VH-8G 802.1Q VLAN Base Inf ormation Displays basic VLAN informa tion, such as VLAN version number and maximum VLANs suppor ted.
9033640 VH-8G Use r Interface 27 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 on the switch.
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 chan ge any of the por t setti ngs, use the Port Co nfigura tion men u.
9033640 VH-8G Use r Interface 29 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.
30 VH-8 G User Inter face VH-8G Parameter D efault Description Spanning Tree Protocol Enabled Enable this parameter t o participate in an S TA compliant network. Priority 32,768 Device priority is used i n selecting the root device, root port, and designated port.
9033640 VH-8G Use r Interface 31 Configuring STA fo r Ports The foll owing fi gure an d table de scrib e STA co nfiguratio n for po rts. Figure 2-24. Spann ing Tree Port Config uration V ertical Hor i.
32 VH-8 G User Inter face VH-8G 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 brid ge or fo r a spe cific po rt. To make any change s to the pa rameters fo r the Span ning Tree, us e the Spa nning Tree Config uration m enu.
9033640 VH-8G Use r Interface 33 Disp layi ng the Cur ren t Bri dge STA The param eters shown i n the foll owing fi gure a nd tabl e describ e the current Bri dge STA Info rmation.
34 VH-8 G User Inter face VH-8G Disp layi ng th e Cur rent STA for Po rts The param eters sh own in t he foll owing fi gure and t able a re for port STA Informat ion.
9033640 VH-8G Use r Interface 35 The rules defining port status are: • A port on a network seg ment with no other S TA-compliant bridging device is always forwarding.
36 VH-8 G User Inter face VH-8G 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.
9033640 VH-8G Use r Interface 37 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 recovery . You can confi gure up to four trunk connec tions (co mbining 2 ~4 ports into a fat pipe) b etween an y two VH-8G switche s.
38 VH-8 G User Inter face VH-8G You can use the Port Trunking C onfigur ation scre en set up port trunk s as shown below: Figure 2-29. Port Trunking Configuration V ertical Hor izon Loca l Mana gement.
9033640 VH-8G Use r Interface 39 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.
40 VH-8 G User Inter face VH-8G Configuring IG MP This pro tocol al lows a ho st to in form its loc al sw itc h/ro uter that 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 .
9033640 VH-8G Use r Interface 41 Configuring Broad cast Storm Control Use the Bro adcas t Storm Cont rol Confi guratio n screen to enable broa dcas t stor m co ntro l for any por t on t he swi tch, as sh own be low: Figure 2-31 .
42 VH-8 G User Inter face VH-8G 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.
9033640 VH-8G Use r Interface 43 Bridge Settings Traffic Class* Multiple traffic classe s are su pported by this sw itch as ind icated under Bridge Capabilities.
44 VH-8 G User Inter face VH-8G 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. You can u se the 802 .
9033640 VH-8G Use r Interface 45 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.
46 VH-8 G User Inter face VH-8G 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.
9033640 VH-8G Use r Interface 47 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.
48 VH-8 G User Inter face VH-8G 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.
9033640 VH-8G Use r Interface 49 802.1Q VLAN Static Table Configuration Use this screen to create a new VLAN or modify th e setting s for an existi ng VLAN. You can add /delete port me mbers for a VLAN, or prev ent a port from bei ng automati cally added to a VLAN via the GVRP protoc ol.
50 VH-8 G User Inter face VH-8G For exam ple, the f ollowin g screen display s setting s for VLAN 2, which includ es tagged ports 1 -4, and forbidden port 8.
9033640 VH-8G Use r Interface 51 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 Hor izon Loca l Mana gement -- VH-8G Port Assi gnment V LAN Conf iguration Port PVID 80 2.
52 VH-8 G User Inter face VH-8G 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 .
9033640 VH-8G Use r Interface 53 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.
54 VH-8 G User Inter face VH-8G 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.
9033640 VH-8G Use r Interface 55 Port S ecurity Configuration Use the Po rt Securi ty Conf igurati on screen to enable and c onfigur e port secur ity fo r the sw itch. Port sec urit y allo ws you to co nfig ure ea ch por t 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 .
56 VH-8 G User Inter face VH-8G 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.
9033640 VH-8G Use r Interface 57 Displaying Port St atistics Port Statis tics dis play key stat istics fr om the Ethernet-lik e MIB for each port. Error s tatis tics on t he traffic passi ng through each port are di splay ed.
58 VH-8 G User Inter face VH-8G Displaying RMON Statistic s Use th e RMON Stati stics s creen to displa y key s tatistics for each port from RMO N group 1. (RMON gro ups 2, 3 and 9 c an only b e acces sed using SNM P man agement s oftware.) The fol lowing screen di splays the overall statis tics on traffic passing throug h each port.
9033640 VH-8G Use r Interface 59 Parameter Description Drop Events The total number of events in which pack ets were dropped due to lack of res ources. Received Bytes Total numbe r of bytes of dat a received on t he network. Th is statistic can be used as a reasonable indication of Ethernet utilization.
60 VH-8 G User Inter face VH-8G Displaying the Unicast Address 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.
9033640 VH-8G Use r Interface 61 Displaying the IP Mul ticast Reg istration T able 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.
62 VH-8 G User Inter face VH-8G 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 sh own be low.
9033640 VH-8G Use r Interface 63 Resetti ng the Sy stem Select the Sys tem Rest art Menu und er the Main Men u to reset the swit ch. The rese t scre en includ es optio ns as shown i n the foll owing fi gure an d table.
64 VH-8 G User Inter face VH-8G.
9033640 Configuring & Monitoring th e Switch 65 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 performanc e and status.
66 Configuring & Monitoring th e Switch VH-8G Setting Password Protec tion The VH-8 G swit ch is factory-c onfigu red with admin istrator ac cess ri ghts to the cons ole menu s set to R EAD/WRITE. Thi s setti ng allows any one to use the cons ole menus to modi fy any operation al para meter.
9033640 Configuring & Monitoring th e Switch 67 Assigning an IP Address To assi gn an IP address to the switch, do the followi ng: 1. Select Manage ment Se tup Menu from th e Main m enu. 2. Select Network Configu ration and then IP Configu ration.
68 Configuring & Monitoring th e Switch VH-8G Setting SNMP Management Access Access to the VH-8G switch th rough SNM P is con trolled by commun ity names. The co mmun ity names set for the swi tch must m atch those use d by the SN MP man ageme nt station for suc cessfu l commu nication to occur.
9033640 Configuring & Monitoring th e Switch 69 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, one p ort bec omes a m onitor po rt for any o ther port on the switch.
70 Configuring & Monitoring th e Switch VH-8G Downlo ading Vi a the Seri al Port A serial downloa d is the e asiest met hod to u pgrade the VH-8G s witch 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.
9033640 Configuring & Monitoring th e Switch 71 Downloading Via TFTP To perfor m a TFTP downloa d, you must first con figure the VH-8G switch . This c onsists of program ming th e switc h with an IP addr ess, if this has no t already been done , and e ntering th e IP add ress of the TFTP s erver an d the name of the upgrad e file.
72 Configuring & Monitoring th e Switch VH-8G Configuring Spanning Tree Param eters The VH-8G switch suppo rts the IEEE 802.1D Spa nning Tree Protoco l. This pro tocol allows red undant conne ctions to be create d betwee n LAN segmen ts for purp oses of fault tol erance.
9033640 Configuring & Monitoring th e Switch 73 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 wir e. Be cause VLANs a re bas ed on logica l inst ead of phys ica l connec tions, the y are e xtremely flexibl e.
74 Configuring & Monitoring th e Switch VH-8G Configuring Port Operation You can config ure swi tch ports for opera tional paramete rs such a s auto- negotia tion, d uplex m ode, and f low control. T he 100 0Base-SX fib er ports always operate at 1000Mb ps sp eed.
9033640 Configuring & Monitoring th e Switch 75 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 an d sec urit y of your netw ork.
76 Configuring & Monitoring th e Switch VH-8G 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 .
9033640 Configuring & Monitoring th e Switch 77 Configuring Port Trunks You can configure up to four p ort trunks on the VH-8G sw itch. Eac h trunk can co mbine up to four ports i nto an agg regate c onnecti on with u p to 8Gbps of ba ndwidth when o perating a t full dupl ex.
78 Configuring & Monitoring th e Switch VH-8G.
9033640 SNMP Managem ent 79 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. Network eq uipm ent comm only ma naged with SNM P incl udes hub s, sw itches , routers , and hos t compu ters.
80 SNMP Manage ment VH-8G 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.
9033640 SNMP Managem ent 81 This M IB reports in formation about the protoco ls an d network i nterfaces supporte d on th e agent it self, a s well as other g eneral inf ormation. The MIB is d ivided i nto a n umber of g roups, each of w hich co rresponds to a specif ic protoc ol or s et of inform ation.
82 SNMP Manage ment VH-8G IEEE 802 .1Q (Q-MIB) This M IB include s the set of manage d obje cts as defi ned in the IEEE 802.1Q VLAN standard . This M IB provides managem ent for the VLAN aspect s of th e switc h.
9033640 Spanning Tree Concept s 83 APPENDIX A. SP ANNING 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.
84 Spa nning Tre e Concep ts VH-8G Spanning Tree Protocol in a Network Figure A -1 i llustrate s the use of an VH-8 G swi tch to esta blish a n effe ctive Spanning Tree conf igurati on. Switc hes A, B an d C are c onnec ted together in a red undan t topology (more tha n one path between two points).
9033640 Spanning Tree Concept s 85 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-8G switch d efault settings for each p aramet er.
86 Spa nning Tre e Concep ts VH-8G 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 s a.
9033640 Spanning Tree Concept s 87 There are five (5) s tates that the port s can be in for spa nning tree: • Block ing : A port in t his stat e do es n ot p arti cipat e in th e tr ansmis sio n 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.
88 Spa nning Tre e Concep ts VH-8G.
9033640 Virtual LANs (VLANs) 89 APPENDIX B. VIRTUAL LANS (VLANS) VLANs and Frame Tagging The VH-8G switch suppo rts IEEE 802.1 Q-complia nt virtual LANs (VLANs). This cap abilit y provide s a highl y effi cient architect ure for establi shing VLAN s wit hin a netw ork and for con trolling b roadca st/ multic ast traffic betwee n workgroups .
VH-8G VLAN Configuration VLAN ope ration on the VH-8G is e nabled by default. The refore, al l frames are trans ferred inter nally through the switch wit h a VLAN ta g. This ta g may al ready be o n the f rame en tering the switch , or add ed to th e frame by the s witch.
9033640 Virtual LANs (VLANs) 91 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.
92 Virtual LANs (VLANs) VH-8G 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.
9033640 Class of Service 93 APPENDIX C. CLASS OF SERVICE Class o f Service s upport on the VH -8G switc h allows y ou to a ssign mission-c ritic al data a higher p riority throug h the switc h by dela ying less critica l traffic d uring p eriods of conge stion.
94 Class of Service VH-8G 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.
9033640 IP Multicast Filtering 95 APPENDIX D. IP MULTICAST 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.
96 IP Multicast F iltering VH-8G.
9033640 Index 1 INDEX A address table unicast, 60 aging time, configuring, 75 Auto-negotiation, configuring, 74 B BootP, configuring, 76 bridge MIB extensions, 42 C Class of Ser vice, configuring, 45,.
2 Index VH-8G priority port configuration, 45 port information, 46 tr affi c cl ass , 44 R restarting the sy stem, 63 S serial port configuration, 17 connections, 1 download, 69 SET operations, 80 SNM.
9033640 Ind ex 3.
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150183-102 R01.
デバイスEnterasys Networks VH-8Gの購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
Enterasys Networks VH-8Gをまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはEnterasys Networks VH-8Gの技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Enterasys Networks VH-8Gの取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Enterasys Networks VH-8Gで得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Enterasys Networks VH-8Gを既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はEnterasys Networks VH-8Gの不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Enterasys Networks VH-8Gに関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちEnterasys Networks VH-8Gデバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
