Manuale d’uso / di manutenzione del prodotto Vertical Horizon VH-8G del fabbricante Enterasys
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9033 640 V ERTICAL HORIZON VH-8G GIGABIT ETHERNET SWITCH MA NAG EMEN T G UID E.
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Notice 9033640 i NOTICE Enterasys N etworks reserves the rig ht to make chan ges in specifications and other informa tion cont ained in this do cume nt without prior noti ce. The rea der should in all cases consul t Entera sys Networks to determi ne whet her any such cha nges have been ma de.
Notice ii 9033640.
9033640 Table of Cont ents i ii TABLE OF CONTENTS 1. MANAGEMENT OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Config uration O ptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv Ta ble o f Cont ent s VH-8G Displ aying the IP M ulticas t Registrati on Table . . . . . . . . . . . . . . . 61 Config uring Stati c Unicast Addresses . . . . . . . . . . . . . . . . . . . . . . 62 Reset ting the Sy stem . . . . . . . . . . . . . .
9033640 Table of Conte nts v APPENDIX B. VIRTUAL LANS (VLANS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 9 VLANs a nd Frame T agging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 9 VH-8G VLAN Con figurat ion . . .
vi Ta ble o f Cont ent s VH-8G.
9033640 Man ageme nt Over view 1 1. MANAGEMENT OVERVIEW Configuration Options For a dvan ce d mana gem ent capa bil ity , th e En tera sys N et work s’ V erti ca l Horizo n VH-8G provid es a men u-driven s ystem c onfigur ation prog ram.
2 Manageme nt Overview VH-8G In-Band Connections Prior to access ing the s witch v ia a netwo rk con nection, y ou must first conf igure it with a valid IP a ddress, s ubnet mas k, an d default g ateway usin g an out -of- ban d co nne ctio n or the Boot P pro toc ol .
9033640 VH-8 G User Interfa ce 3 2. VH-8G USE R INTERFACE Ove rview Acce ss is gain ed to the co nsole men us by direct ly con necting a term inal to the consol e port wi th a nul l-modem cable co nnect ion, or using Tel net to ac cess th e switc h over the netw ork.
4 VH- 8G User Interf ace VH-8G User A ccess Once a direct connec tion to the cons ole port or a Telne t connec tion is esta blished, the login scree n for the on -board con figurat ion pro gram appe ars. You may need to pre ss Enter a fe w times to display the scree n.
9033640 VH-8 G User Interfa ce 5 Factory Defaults Tabl e 2-1 list s the d efault settings for swit ch co nfiguration param eters. Each parameter can be chan ged via th e con sole men us or Teln et.
6 VH- 8G User Interf ace VH-8G Virtual LANs Acceptable VLA N Frame Type All Configurable PVID Tagging Yes GVRP Disabled Untagged VLAN Group Assignm ent 1 VLAN Ingress F iltering False VLAN Learning SV.
9033640 VH-8 G User Interfa ce 7 Main Menu The M ain Menu i s the first s creen seen after su ccessfu lly lo gging into t he system . Figu re 2-2 sho ws the M ain Menu and the a ccompan ying table des cri bes th e Mai n Men u. Figure 2 -2. Main M enu V e rtical H orizon Local Ma nagem ent -- VH-8 G Main M enu System Info rmati on Menu.
8 VH- 8G User Interf ace VH-8G Device Con trol Menu Port Configuration Enables any port, enables/disables flow control, and sets communicat ion mode to aut o-negotiation, full duplex or ha lf duplex. Port Inform ation Displays oper ational status, including link state, flow control method, and dup lex mode.
9033640 VH-8 G User Interfa ce 9 System Informa tion Menu Use th e Syst em Inform ation Men u to di splay a basic de script ion of the switc h, inclu ding cont act in formation, and ha rdware/fi rmware vers ions.
10 VH-8 G User In terface VH-8G Displayin g System Informat ion Use th e System Inform ation scre en to dis play des cripti ve inform ation abou t the sw itch, or for quick system identifi cation as shown in the foll owing fi gure and ta ble. Fi gure 2-4 .
9033640 VH-8G User Inter face 11 Displaying Switch Version Use t he Switc h Informa tion scre en to display ha rdware/fir mware vers ion num bers for the switch , as we ll as the power status o f the s ystem. Figure 2-5. Switch Info rmation V e rtical H orizon Local Ma nagem ent -- VH-8 G Switch In formation Main B oard Hardware V ersion : V0.
12 VH-8 G User In terface VH-8G Management Setup Menu After i nitial ly loggi ng onto the sys tem, adju st the c ommuni cation paramet ers for y our cons ole to ensure a r eliabl e connec tion (Serial Port Config uration).
9033640 VH-8G User Inter face 13 Changing the Network Configu ration Use t he Netw ork Confi guratio n menu t o set the bootu p option, confi gure the switch ’s Inte rnet Pro tocol (I P) para meters, enable the o n-board W eb server, or to se t the numb er of c oncurrent T elnet session s allow ed.
14 VH-8 G User In terface VH-8G IP Configura tion Use the IP Configu ration s creen to se t the boot up option, o r config ure the switc h’s IP para meters.
9033640 VH-8G User Inter face 15 IP Connectivi ty Test (P ing) Use the IP Connectiv ity Test to see if anoth er site on the Internet can be reac hed. The s creen sho wn belo w is de scribe d in the f ollowin g table .
16 VH-8 G User In terface VH-8G HTTP Configuratio n Use the HTT P Co nfiguration scr een to e nable /disable the on-boar d Web server, and to s pecify the TCP po rt that wi ll provid e HTTP service . The screen show n below is desc ribed i n the foll owing ta ble.
9033640 VH-8G User Inter face 17 Configuring th e Serial Po rt You ca n access the on-bo ard configu ration program by att achin g a VT100 compat ible d evice to the switch ’s se rial port. (F or more informati on on conn ecting to this port, see “Re quired Connec tions” on page 1.
18 VH-8 G User In terface VH-8G Assi gning SNMP Pa ramete rs Use the SNMP Configura tion sc reen to displ ay and modi fy paramete rs for the Sim ple Netwo rk Managem ent Proto col (SNMP). The s witch in cludes an SNMP a gent whic h monitors the status o f its hardware, a s well as the traffi c passin g throu gh its po rts.
9033640 VH-8G User Inter face 19 Configurin g Community Na mes The f ollowin g figure and tabl e desc ribe how to confi gure the comm unity strin gs authori zed for m anagemen t acces s.
20 VH-8 G User In terface VH-8G Configurin g IP Trap Man agers The f ollowin g figur e and ta ble desc ribe h ow to sp ecify ma nagemen t stati ons that will receiv e authent ication fail ure message s or other trap messa ges fro m the sw itch. Up to 5 trap manag ers ma y be ente red.
9033640 VH-8G User Inter face 21 Console L ogin Configuration Use th e Manage ment Se tup: Con sole Log in Confi guration to restrict man agement a ccess based on spec ified us er nam es and passwo rds, or to set the inva lid passw ord thre shold and timeou t.
22 VH-8 G User In terface VH-8G Downlo ading Sy stem So ftware Using T FTP Protocol to Downlo ad Over the Network Use t he TFTP Downl oad m enu to lo ad so ftware updat es in to the swi tch. The d ownload file shou ld be an VH -8G file from En terasys; otherwis e the switc h will not accept it.
9033640 VH-8G User Inter face 23 Saving the Syst em Config uratio n Use th e Config uratio n Save & Res tore me nu to sav e the sw itch conf igurati on settin gs to a fil e on a TFTP se rver. The fi le ca n be la ter downl oaded to the switc h to restore the switch’ s settings .
24 VH-8 G User In terface VH-8G Configur ing Manag ement Access Use th e Manage ment Co nfigura tion menu to def ine whi ch VLAN h as man agement ac cess to the switc h. Paramete rs show n on this s creen are indi cated in the follow ing figure and tabl e.
9033640 VH-8G User Inter face 25 Configuring the Switch The De vice Control m enu is u sed to co ntrol a broad r ange o f function s, includ ing po rt configu ration, Spanning T ree sup port for redundant switc hes, port mi rroring, mul ticast fil tering, and Virtual LANs .
26 VH-8 G User In terface VH-8G 802.1Q VLAN Base In format ion Displays basic VLAN information, such as VLAN version number and maximum VLANs suppor ted.
9033640 VH-8G User Inter face 27 Configuring P ort Para meters Use th e Port Con figurat ion me nus to s et or di splay commun ication paramete rs for a ny port on the switc h.
Viewing the Current P ort Configuration The Po rt Informati on screen display s the port ty pe, statu s, link s tate, and flow c ontrol in u se, as we ll as the com munica tion s peed and dupl ex mo de. To c hange any of the port setti ngs, use the Port C onfigura tion men u.
9033640 VH-8G User Inter face 29 Using the Spanning Tr ee Algorithm The Sp anning Tre e Algori thm can be used to d etect a nd disabl e network loop s, and to provide back up links between swit ches, bri dges o r routers .
30 VH-8 G User In terface VH-8G Parameter D efault Description Spanning Tree Protocol Enabled Enable this param eter to participate in an STA compliant network . Priority 32,768 Device priority is used i n selecting the root device, root port, and designated port.
9033640 VH-8G User Inter face 31 Configurin g STA for Ports The f ollowin g figure an d tabl e describ e STA co nfigura tion for po rts. Figure 2-2 4. Spann ing Tree Po rt Configuration V e rtical H o.
32 VH-8 G User In terface VH-8G Viewing the Current S panning Tree Configuratio n The Sp anning Tre e Inform ation sc reen dis plays a s ummary of the S TA infor mation for the overall b ridge o r for a s pecific port. To ma ke an y chan ges to the pa rameters fo r the Span ning Tre e, use the Spa nning Tr ee Config uration menu.
9033640 VH-8G User Inter face 33 Disp la yin g th e Cur ren t B rid ge S TA The p arameters shown i n the f ollowin g figure a nd tabl e describ e the current Bri dge STA Info rmation.
34 VH-8 G User In terface VH-8G Disp la yin g the Curr en t ST A for Por ts The p arameters shown i n the foll owing fi gure a nd table a re for po rt STA Informat ion.
9033640 VH-8G User Inter face 35 The rules defining port status are: • A port on a network segment wit h no other S TA-compliant bridging device is always forwarding.
36 VH-8 G User In terface VH-8G Using a Mirror Port for Analysis You c an mirror tr affic f rom any s ource port to a tar get port for real-tim e anal ysis. You can then attach a log ic analy zer or RM ON probe t o the targe t port an d study t he traffi c cross ing the s ource p ort in a co mple tely unob trusive m anner.
9033640 VH-8G User Inter face 37 Configuring P ort Trunks Port tru nks can be used t o incre ase the b andwidt h of a netw ork conn ection or to ens ure fault recov ery. You can co nfigure up to four trunk conn ections (combini ng 2~4 ports into a fat pipe) b etween an y two VH -8G switc hes.
38 VH-8 G User In terface VH-8G You can use the Port Trunki ng Configu ration scre en set up port trunk s as shown below: Figure 2-2 9. Port Trunking Configuratio n V e rtical H orizon Local Ma nagem .
9033640 VH-8G User Inter face 39 IGMP Multica st Filtering Mul ticasting is used to su pport rea l-time ap plicatio ns such as video conf erencing or strea ming aud io. A multicast serve r does not have to esta blish a se parate conn ectio n with eac h client.
40 VH-8 G User In terface VH-8G Configurin g IGMP Thi s pr ot ocol al lows a host to in form its l ocal sw itc h/ro ute r t hat it want s t o rece ive tra nsmission s addr essed to a spec ific multicas t group . You can use the IGMP Con figurat ion sc reen to con figure m ulticas t filtering show n bel ow: Figure 2-30.
9033640 VH-8G User Inter face 41 Configuring Br oadcast Storm Control Use th e Broadcas t Storm C ontrol Co nfiguratio n screen to enab le bro adc ast storm cont ro l fo r any p ort on t he swi tch , as show n bel ow: Figure 2-31.
42 VH-8 G User In terface VH-8G Configuring Brid ge MIB Extensions The Bri dge MIB in clude s ext ensions for manag ed dev ices tha t supp ort Traffi c Clas ses, Mul ticast Fi ltering and Virtua l LANs. T o conf igure thes e exte nsions, use the Ex tended Bridge Confi guratio n screen as show n bel ow: Figure 2-3 2.
9033640 VH-8G User Inter face 43 Bridge Settings Traffic Class* Multiple traffic classes ar e supported by this sw itch as indica ted under Bridge Capabilities.
44 VH-8 G User In terface VH-8G Configuring Tr affic Classes IEEE 802 .1p de fines up to 8 se parate traffic classes . This s witch s upports Qualit y of Serv ice (Qo S) by us ing two priority q ueues, w ith weight ed fair queu ing for each port. You ca n use the 802.
9033640 VH-8G User Inter face 45 Port Priority Configuration The d efault prio rity fo r all ingre ss ports is zero. T herefore , any inbound frames that do not have priority tags w ill be pla ced in th e low pri ority outpu t queue .
46 VH-8 G User In terface VH-8G 802.1 P Port Traffic Class Inf ormation This switch provides two prio rity le vels with w eighted fair qu euing f or port egr ess .
9033640 VH-8G User Inter face 47 Configuring Virtual LANs You c an use th e VLAN co nfigurat ion menu to assig n any por t on the switc h to an y of up to 256 LAN groups . In conve ntiona l netwo rks with route rs, broa dcast traf fic is split up into s eparate do mains .
48 VH-8 G User In terface VH-8G 802.1 Q VLAN Current Table In formation This sc reen show s the current po rt memb ers of each VLAN an d whether or no t the port s upports VLAN taggin g. Ports assigne d to a large VLAN group that c rosses severa l switche s sho uld use VLAN tagg ing.
9033640 VH-8G User Inter face 49 802.1 Q VLAN Static T able Configuratio n 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 autom atically added to a VLAN v ia the GVRP pro tocol.
50 VH-8 G User In terface VH-8G For ex ample, t he follow ing scre en displ ays setting s for VL AN 2, whic h includ es tag ged ports 1 -4, and forbid den port 8.
9033640 VH-8G User Inter face 51 Port Assignment VLAN Co nfiguration Use this screen to confi gure port-s pecific se ttings fo r IEEE 802.1Q VL AN featu res. Figure 2 -40. Port Assign ment VLAN Conf iguration V e rtical H orizon Local M anagem ent -- VH-8 G Port A ssignmen t VLAN Conf iguration Port P VID 802.
52 VH-8 G User In terface VH-8G Multicast Router Port Informa tion You c an use th e Multic ast Rout er Port In formation screen to display the ports on this s witch atta ched t o a neighb oring m ulticas t router /switch for each VLAN ID. Figure 2-41.
9033640 VH-8G User Inter face 53 Static Multicast Router P ort Configuration You c an use th e Static M ulticast Router Por t Configu ration scree n to assign ports that are attached to a ne ighbor ing multi cast r outer/swi tch.
54 VH-8 G User In terface VH-8G IGMP Me mber Port Configuration You c an use the IGMP Me mber Po rt Config uration screen to assign p orts that a re attache d to hos ts who wa nt to recei ve a spec ific mul ticast serv ice.
9033640 VH-8G User Inter face 55 Port S ecurity Configuration Use th e Port Se curity Conf igurati on screen to ena ble an d configu re port secu rity for th e swit ch. Port secur ity a llows yo u to co nfig ure each po rt with a li st of MA C addres ses of d evice s that are authori zed to access the network through t hat port .
56 VH-8 G User In terface VH-8G Monitoring the Switch The Ne twork Moni tor Menu p rovides a ccess to p ort statist ics, RMON stati stics, I P multica st addres ses, and the sta tic (unic ast) addre ss table. Each of the scre ens pr ovide d by these menus i s desc ribed in t he foll owing secti ons.
9033640 VH-8G User Inter face 57 Displayin g Port Statis tics Port Sta tistics display key stat istics from the Ethernet -like MIB for eac h port. Error statis tics on t he traffi c passi ng thro ugh each port are display ed.
58 VH-8 G User In terface VH-8G Displayin g RMON Statis tics Use th e RMON Statistics screen to displa y key s tatistics for ea ch port from RMON group 1. (RMON groups 2, 3 and 9 can onl y be acces sed usi ng SNMP man ageme nt softwa re.) The fol lowing screen display s the over all st atistics on traf fic pass ing thro ugh each port.
9033640 VH-8G User Inter face 59 Parameter Descrip tion Drop Events T he total number of events in w hich packets were dr opped due to lack of res ources. Received By tes Tota l number of by tes of data r eceived on t he network. T his statistic can be used as a reasonable indicati on of Ethernet utilization.
60 VH-8 G User In terface VH-8G Displayin g the Unic ast Addr ess T able The Ad dress Tab le contai ns the M AC addres ses and VLAN iden tifier assoc iated with e ach port (t hat is, the source p ort assoc iated with the addre ss and VLAN), so rted by MA C address or VL AN ID.
9033640 VH-8G User Inter face 61 Displayin g the IP Multicast Regist ration Ta ble Use t he IP M ulticas t Regis tratio n Table t o dis play al l the multi cast grou ps active on thi s switch, inclu ding mul ticast IP a ddresses and the corresp onding VLAN I D.
62 VH-8 G User In terface VH-8G Configuring Sta tic Unica st Addresses Use th e Static U nicast Address Ta ble Con figurati on scree n to manu ally conf igure hos t MAC add resses i n the u nicast ta ble. You c an use th is screen to assoc iate a MAC add ress with a spec ific VLAN ID and sw itch por t as shown bel ow.
9033640 VH-8G User Inter face 63 Rese tting the Syst em Selec t the System Rest art Menu under the Main Menu to reset the sw itch. The re set scre en includ es op tions as shown i n the f ollowin g figur e and table .
64 VH-8 G User In terface VH-8G.
9033640 Configuring & Monitoring th e Switch 65 3. CONFIGURING & MONITORING THE SWIT CH Common Tasks The s witch c onsole menus allow you to mo dify d efault switch settin gs and conf igure t he switch for netw ork man ageme nt. They a lso al low you to mon itor swi tch perform ance and status .
66 Configuring & Monito ring the Switch VH-8G Setting Passw ord Protection The VH-8 G swit ch is factor y-conf igured with adm inistrato r acce ss rights to the c onsole me nus se t to READ/WRIT E. This setti ng allo ws anyone to use the cons ole me nus to m odify any operat ional parameter.
9033640 Configuring & Monitoring th e Switch 67 Assigning an IP Address To as sign an IP addres s to the switch, do the follow ing: 1. Selec t Manage ment Se tup Me nu from th e Main m enu. 2. Selec t Network Configu ration and the n IP Configu ration.
68 Configuring & Monito ring the Switch VH-8G Setting SNMP Manageme nt Access Acce ss to the VH-8G switc h through SNM P is con trolled by comm unity nam es. The commun ity names set fo r the swi tch mu st mat ch those u sed by th e SNMP man ageme nt stat ion for suc cessfu l commu nication to occur.
9033640 Configuring & Monitoring th e Switch 69 Configuring Port Mirroring You c an mirror th e traffi c being s witche d on any port for t he purp oses of network traffic a nalys is and c onnectio n assuran ce. When P ort Mirroring is enab led, o ne port becomes a m onitor po rt for an y other port on the switc h.
70 Configuring & Monito ring the Switch VH-8G Downl oading Vi a th e Seri al Port A serial downloa d is the e asiest m ethod to u pgrade the VH-8G s witch softwa re, requ iring t he least a mount of equipm ent and c onfigu ration. To do wnload switch software via th e serial port, do the fol lowing: 1.
9033640 Configuring & Monitoring th e Switch 71 Downloading Via TFTP To perfo rm a TFTP downloa d, you must firs t configur e the VH-8G swit ch. This consis ts of pro gramming the sw itch with an IP a ddress , if this has no t alrea dy been d one, and e ntering the IP add ress o f the TF TP server an d the na me of the up grade file.
72 Configuring & Monito ring the Switch VH-8G Configuring Spanning Tree Pa rameters The VH-8 G switch su pports the IEEE 802. 1D Spanning Tree Protoco l. This protocol allows redundant conne ction s to be cre ated betw een LA N segmen ts for p urposes of faul t toleranc e.
9033640 Configuring & Monitoring th e Switch 73 Configuring VLANs A virtua l LAN (VLAN) is a grou p of devices on one or more LAN s that are conf igured such tha t they can com municate as if the y were attac hed to the same wi re. B eca use VLAN s are ba sed on lo gica l in stead of ph ysic al conn ections , they are e xtrem ely flex ible.
74 Configuring & Monito ring the Switch VH-8G Configuring Port Opera tion You c an config ure swi tch po rts for o perational paramete rs suc h as auto - nego tiation, d uplex mode, an d flow control. The 100 0Base-SX fiber ports alway s operate at 1000 Mbps sp eed.
9033640 Configuring & Monitoring th e Switch 75 Configuring the Unicast Address Table The Un icast Add ress Table allows yo u to de signa te forwar ding tre atment throu gh the switch for specific MAC add resses, all owing you to maintain the effic ien cy and secur it y of yo ur ne twor k.
76 Configuring & Monito ring the Switch VH-8G Setting a Default Gateway The default G ateway pa rameter d efines th e IP ad dress of a rou ter or othe r network devi ce to wh ich IP pac kets a re to be sent if des tined for a subn et outs ide of tha t which the swi tch is operat ing.
9033640 Configuring & Monitoring th e Switch 77 Configuring Port Trunks You c an confi gure up to four p ort trunk s on the VH-8G s witch. Eac h trunk can combine up to f our ports i nto an aggrega te connec tion wi th up to 8Gbps of ba ndwidth when o peratin g at f ull dupl ex.
78 Configuring & Monito ring the Switch VH-8G.
9033640 SNM P Mana gemen t 79 4. SNMP MANAGEMENT The SNMP Protocol SNMP (Sim ple Ne twork Mana gement Prot ocol) i s a commu nication proto col desi gned s pecific ally for th e purpo se of man aging dev ices or other eleme nts on a n etwork. Network equipm ent comm only managed with SN MP incl udes hubs, switch es, routers , and host com puters.
80 SN MP Man ageme nt VH-8G There are three m ain opera tions defi ned in SN MP: • GET operations read informat ion fro m the m anaged device , such as thos e used to obtain status o r statis tical data.
9033640 SNM P Mana gemen t 81 This MIB reports informati on about the prot ocols an d network interfac es supp orted on th e agen t itself, a s well as other g eneral informati on. The MIB i s divided i nto a n umber of g roups, each o f which co rrespon ds to a specif ic prot ocol or s et of in formation .
82 SN MP Man ageme nt VH-8G IEEE 802 .1Q (Q-MIB) This MIB include s the s et of man aged obje cts as d efined in the IEEE 802.1 Q VLAN stan dard. This MIB provi des mana gement fo r the VLAN aspe cts o f the sw itch.
9033640 Spanni ng Tr ee Con cepts 83 APPENDIX A. SP ANNIN G TREE CONCEPTS General The I EEE 802.1D Span ning T ree Protoc ol resol ves the p roblems of phys ical loops in a network by establ ishing one prim ary path betwe en any two sw itches in a n etwork.
84 Spa nning T ree Co ncepts VH-8 G Spanning Tree P rotocol in a Network Figu re A-1 i llust rates the use of an VH -8G sw itch to esta blish a n effe ctive Spann ing Tree c onfigu ration. Sw itches A, B and C a re connec ted toget her in a redundan t topology (more tha n one p ath bet ween two poin ts).
9033640 Spanni ng Tr ee Con cepts 85 Spanning Tree P rotocol Parameters Seve ral config uration paramete rs control the ope ration of t he Spanning Tree Pr otocol . Table A-1 describes the p arameters and lists the VH-8 G switc h default settin gs for eac h paramet er.
86 Spa nning T ree Co ncepts VH-8 G Spanning Tree P rotocol Operation When the Spanni ng Tree Protocol i s enabled for the firs t time or when there is a change i n the networ k topolo gy, such a s a .
9033640 Spanni ng Tr ee Con cepts 87 There are five (5 ) states t hat the ports can be in for s panning tree: • Bloc ki ng: A po rt i n t his st ate do es n ot pa rtici pat e i n th e t ran smis sio n of fram es, thus pre venting du plica tion arisin g throug h multiple paths existi ng in t he active topol ogy of the bridge d LAN.
88 Spa nning T ree Co ncepts VH-8 G.
9033640 Virtual LANs (VLANs) 89 APPENDIX B. VIRTUAL LANS (VLAN S) VLANs and Frame Tagging The VH-8 G switch su pports IEEE 8 02.1Q-compl iant virtu al LANs (VLAN s). This cap abilit y prov ides a hi ghly effi cient architect ure for esta blishing VLANs wit hin a n etwork a nd for con trollin g broad cast/ multic ast tra ffic betwee n workgro ups.
VH-8G VLAN Configuration VLAN ope ration on the VH-8G is e nabled by defaul t. Therefo re, all frame s are tra nsferred i nternal ly through the switc h with a VLAN ta g. This tag may al ready be on th e frame en tering the swi tch, or added to th e fram e by th e switch.
9033640 Virtual LANs (VLANs) 91 Forwarding Tagged/Untagged Fra mes Ports c an be ass igned to m ultip le tagged o r untag ged VLANs . Each port on t he swi tch i s ther efore cap able o f pas sing tag ged o r untag ged f rames.
92 Virtual LANs (VLANs) VH-8G Forwardin g Traffic with Unknown VLAN Tags This switch on ly suppo rts 25 6 VLANs wit h VLAN IDs ranging from 1 to 2048 , but the IEEE 802.
9033640 Class of Service 93 APPENDIX C. CLASS OF SERVICE Class of Servic e support on the VH-8G switc h allo ws you to a ssign missi on-crit ical data a high er priority throug h the sw itch by d elaying less criti cal traffi c during p eriods of conge stion.
94 Class of Service VH-8G Figu re C-1 sh ows prio rity qu euing ope rating within a s witch. Fr ames enter ing the switch through p orts 1 a nd 4 are ta gged a s 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 FILT ERING IGMP Snooping a nd IP Multicast Filtering The I nternet Gro up Ma nagement Protocol (IG MP) runs b etween hosts and the ir immedia tely neighb oring mu lticast rout er/switc h.
96 IP Multica st Filtering 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 e xtensions, 42 C Class of Ser vice, configuring, 45.
2 Inde x VH-8G priority port configuration, 45 port information, 46 tr af fic cl ass, 4 4 R restarting t he system, 63 S serial port configuration, 17 connections, 1 download, 69 SET operations, 80 SN.
90336 40 Index 3.
.
.
150183-10 2 R01.
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 Enterasys Vertical Horizon VH-8G 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 Enterasys Vertical Horizon VH-8G - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Enterasys Enterasys Vertical Horizon VH-8G imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Enterasys Enterasys Vertical Horizon VH-8G ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Enterasys Enterasys Vertical Horizon VH-8G, 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 Enterasys Vertical Horizon VH-8G.
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 Enterasys Vertical Horizon VH-8G. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Enterasys Enterasys Vertical Horizon VH-8G 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.
