Benutzeranleitung / Produktwartung VH-2402S des Produzenten Enterasys
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9033 645-01 V ERTICAL HORIZON VH-2 402S F AST ETHERNET SWITCH MA NAG EMEN T G UID E.
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Notice 9033645-01 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 9033645-01.
9033645-01 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-2 402S Displ aying the Uni cast Addre ss Table . . . . . . . . . . . . . . . . . . . . . 62 Displ aying the IP M ulticas t Registrati on Table . . . . . . . . . . . . . . . 63 Config uring Stati c Unicast Addresses . . . . .
9033645-01 Table of Conte nts v Remappi ng Network To pology . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8 APPENDIX B. VIRTUAL LANS (VLANS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1 VLANs a nd Frame T agging . . . . . .
vi Ta ble o f Cont ent s VH-2 402S.
9033645-01 Man ageme nt Over view 1 1. MANAGEMENT OVERVIEW Configuration Options For ad vanced m anageme nt cap ability, the VH-SMGMT Ve rtical H orizon Man agement M odule provides a me nu-driv en syste m config uration progra m.
2 Manageme nt Overview VH-2 402S When attaching to a PC, set term inal emul ation ty pe to VT100, sp ecify the port us ed by your PC (i.e., COM 1~4), an d then se t com municat ions to 8 data bits, 1 s top bit , no par ity, and 1 9200 b ps (for ini tial c onfigur ation).
9033645-01 Man ageme nt Over view 3 In-Band Network Connec tion The on-board c onfigu ration program c an be access ed usin g Teln et from any c omputer atta ched to th e networ k. The swit ch and st ack ca n also be manage d by any com puter u sing a Web bro wser (Inte rnet Explorer 4 .
4 Manageme nt Overview VH-2 402S.
9033645-01 VH-24 02S Us er Inte rface 5 2. VH-2402S USER INTERFACE Ove rview Acce ss is ga ined t o the cons ole men us by co nnect ing a te rminal to the consol e port (wi th a di rect cabl e connec tion or ov er modem s), or usin g Teln et to acce ss th e Manage ment M odule ov er the n etwork.
6 VH- 2402S Us er Interfa ce VH-2 402S User A ccess Once a direct connec tion to the serial port or a Telnet c onnectio n is esta blished, the login scree n for the on -board con figurat ion pro gram appe ars . You may need to press Enter a few times to displ ay the scree n.
9033645-01 VH-24 02S Us er Inte rface 7 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.
8 VH- 2402S Us er Interfa ce VH-2 402S 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 Lea.
9033645-01 VH-24 02S Us er Inte rface 9 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 ertical Horizo n Loca l Manag ement -- V H-2402 S Main M enu System Info rmati on Menu.
10 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 11 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.
12 VH -2402 S User Interf ace VH-2 402S 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 .
9033645-01 VH-2 402S Us er Inter face 13 Displaying Switch Version and Module Infor mation Use t he Switc h Informa tion scre en to display ha rdware/fir mware vers ion num bers for the main board and agent mod ule, a s well as the pow er statu s and mo dules plugged into th e system .
14 VH -2402 S User Interf ace VH-2 402S 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 ).
9033645-01 VH-2 402S Us er Inter face 15 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 Agent , or to set t he num ber of con current Tel net se ssions allowed .
16 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 17 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.
18 VH -2402 S User Interf ace VH-2 402S HTTP Configuratio n Use the HTT P Co nfiguration scr een to e nable /disable the on-boar d Web agen t, and to s pecif y the TCP port tha t will p rovide HTTP s ervice. The screen show n below is desc ribed i n the foll owing ta ble.
9033645-01 VH-2 402S Us er Inter face 19 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.
20 VH -2402 S User Interf ace VH-2 402S 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 o n-b oard SNM P age nt w hic h mon ito rs t he st atus of its hard war e, as well a s the traff ic passi ng thro ugh its p orts.
9033645-01 VH-2 402S Us er Inter face 21 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. Up to 5 commu nity nam es may be entered . Figure 2 -13.
22 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 23 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.
24 VH -2402 S User Interf ace VH-2 402S 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 do wnload fil e should be an VH-2402S file from Entera sys; otherw ise the a gent wil l not acc ept it.
9033645-01 VH-2 402S Us er Inter face 25 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 .
26 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 27 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 .
28 VH -2402 S User Interf ace VH-2 402S 802.1Q VLAN Base In format ion Displays basic VLAN information, such as VLAN version number and maximum VLANs suppor ted.
9033645-01 VH-2 402S Us er Inter face 29 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 or modul e on the s witch.
30 VH -2402 S User Interf ace VH-2 402S 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 a ny of th e port settings , use t he Port Config uration menu.
9033645-01 VH-2 402S Us er Inter face 31 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 .
32 VH -2402 S User Interf ace VH-2 402S Parameter Default Descriptio n 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.
9033645-01 VH-2 402S Us er Inter face 33 Configurin g STA for Ports or Modules The f ollowin g figure an d tabl e describ e STA co nfigura tion for po rts or mod ules. (Note that the Spanni ng Tree Configu ration screen fo r the expa nsion s lots a lso indic ates modul e type.
34 VH -2402 S User Interf ace VH-2 402S 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 ov erall bridge or for a sp ecific port or modul e. To make any changes to the p arameters for the Sp anning Tre e, use t he Span ning Tree C onfigura tion menu .
9033645-01 VH-2 402S Us er Inter face 35 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.
36 VH -2402 S User Interf ace VH-2 402S Displaying the Current STA for Ports or Module s The p arameters shown i n the foll owing fi gure a nd table a re for po rt or module STA Informat ion (Port 1-12, Port 13 -24, Port 25-3 2).
9033645-01 VH-2 402S Us er Inter face 37 The rules defining port status are: • A port on a network segment with no other STA-com pliant bridging device is always forwarding.
38 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 39 Configuring P ort Trunks Port tru nks can be used t o incre ase the b andwidt h of a netw ork conn ection o r to ensure fault re covery. You can configure up fiv e trunk conn ections (combini ng 2~4 ports into a fat p ipe) betw een any two stan dalone VH -2402S sw itches, or up to 12 for a n entire st ack.
40 VH -2402 S User Interf ace VH-2 402S You can use the Port Trunki ng Configu ration scre en set up port trunk s as shown below: Figure 2 -29. Port Trunki ng Configura tion The RJ -45 por ts used fo r each trunk must all be on t he same interna l switc h chip.
9033645-01 VH-2 402S Us er Inter face 41 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.
42 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 43 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.
44 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 45 Bridge Settings Traffic Class* M ultiple traffic classe s are su pported by this sw itch as indicated under Bridge Capabilities.
46 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 47 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 .
48 VH -2402 S User Interf ace VH-2 402S 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 .
9033645-01 VH-2 402S Us er Inter face 49 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 .
50 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 51 802.1 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. Yo u can add /delete po rt members for a VLAN from any unit in the stack, o r prevent a port from being a utomat ically a dded to a VLAN via the GVRP proto col.
52 VH -2402 S User Interf ace VH-2 402S 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 -6, and forbid den port 12 . (Note th at the d ashed line s show that the re are no s witch un its in this sys tem other tha n Unit 1.
9033645-01 VH-2 402S Us er Inter face 53 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 ertical Horizo n Loca l Manag ement -- V H-2402 S Port A ssignmen t VLAN Conf iguration Unit Port PVID 802.
54 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 55 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. Figure 2 -42.
56 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 57 Port S ecurity Configuration Use th e Port Se curity Conf igurati on screen to ena ble an d configu re port securit y for the switch . Port Security allo ws you to conf igure each port 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 .
58 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 59 Displayin g Port Statis tics Port Sta tistics display key stat istics from the Ethernet -like MIB for eac h port.
60 VH -2402 S User Interf ace VH-2 402S Displayin g RMON Statis tics Use t he RMO N S tati sti cs sc re en t o dis pla y ke y st ati sti cs for ea ch p ort or med ia modul e from RMO N group 1 . (RMON grou ps 2, 3 and 9 ca n only be ac cessed using SNM P mana gement s oftware.
9033645-01 VH-2 402S Us er Inter face 61 Parameter Descrip tion Drop Events The total number of events in which pack ets were dropped due to lack of res ources. Received By tes Total numbe r of by tes of data re ceived on the n etwork. This statistic can be used as a reasonable indicati on of Ethernet utilization.
62 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 63 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.
64 VH -2402 S User Interf ace VH-2 402S 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.
9033645-01 VH-2 402S Us er Inter face 65 Rese tting the Syst em Selec t the Syst em Restart Menu u nder the M ain Menu to reset th e man agement a gent. Th e reset s creen i ncludes options as sh own in t he foll owing fi gure and ta ble. Figure 2 -51.
66 VH -2402 S User Interf ace VH-2 402S.
9033645-01 Configuring & Monitoring th e Switch 67 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 monitor switch pe rformance and s tatus.
68 Con figuri ng & Mo nitori ng th e Switch VH-2 402S Setting Passw ord Protection The VH-2 402S sw itch is fa ctory- configured with ad ministra tor acces s right s to th e consol e menus set to READ/WRI TE. This s etting al lows anyo ne to use the c onsole m enus to m odify any opera tional parameter .
9033645-01 Configuring & Monitoring th e Switch 69 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 Menu from the M ain menu . 2. Selec t Network Configu ration and then IP Configu ration.
70 Con figuri ng & Mo nitori ng th e Switch VH-2 402S Setting SNMP Manageme nt Access Acce ss to the VH-2402S switc h thro ugh SNMP is contro lled by comm uni ty nam es. The co mmun ity n ame s set for the s witch mus t ma tch thos e used by the SNMP m anagemen t stati on for suc cessful comm uni catio n to occu r.
9033645-01 Configuring & Monitoring th e Switch 71 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 monito r port fo r any othe r port wi thin th e stack.
72 Con figuri ng & Mo nitori ng th e Switch VH-2 402S Downl oading Vi a th e Seri al Port A serial download is the easiest method to upgrad e the VH-24 02S switch 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.
9033645-01 Configuring & Monitoring th e Switch 73 server a nd the name of th e upgra de file. T o progra m the sw itch IP addre ss, sele ct the Managem ent Setu p Menu fro m the Main Menu screen, then select Networ k Config uration. To do wnload switch software via T FTP, do th e follow ing: 1.
74 Con figuri ng & Mo nitori ng th e Switch VH-2 402S Configuring Spanning Tree Pa rameters The VH-2 402S sw itch supp orts the IEE E 802.1D Spannin g Tree P rotocol. 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.
9033645-01 Configuring & Monitoring th e Switch 75 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.
76 Con figuri ng & Mo nitori ng th e Switch VH-2 402S Configuring Port Opera tion You c an config ure swi tch po rts for o perational paramete rs suc h as auto - nego tiation, du plex mode , port spe ed and flow control. The 100Base-FX fiber ports a lways ope rate in full d uplex mo de and 10 0Mbps speed.
9033645-01 Configuring & Monitoring th e Switch 77 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.
78 Con figuri ng & Mo nitori ng th e Switch VH-2 402S 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.
9033645-01 Configuring & Monitoring th e Switch 79 Configuring Port Trunks You c an config ure up to five po rt trunk s on a sta ndalone VH- 2402S switc h, or up to 12 for a n entire s tack. Eac h trunk can combi ne two, t hree, or fou r ports, creating an agg regate b andwidt h of up to 4Gbps w hen group ing gig abit ports.
80 Con figuri ng & Mo nitori ng th e Switch VH-2 402S.
9033645-01 SNM P Mana gemen t 81 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.
82 SN MP Man ageme nt VH-2 402S 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.
9033645-01 SNM P Mana gemen t 83 RFC 1213 ( MIB-II) RFC 1 213 pr ovides m anageme nt of s ystem-le vel param eters, inc ludin g TCP /IP p rot oco l-re lat ed s tat ist ics, IP addr es sing , and i nte rf ace s tat ist ics for e ach switc h port. MIB-II is the stan dard MIB d efined b y RFC 1213.
84 SN MP Man ageme nt VH-2 402S RFC 1757 (RM ON MIB) RFC 1 757 is a group defi ned un der MIB-II. Th is MI B provides manage ment f or the RM ON aspec ts of the switch . The VH-2 402S s witch supp orts four of the nin e groups of RMON de fined for Ethe rnet net works on a per port basis.
9033645-01 Spanni ng Tr ee Con cepts 85 APPENDIX A. SPANNING 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.
86 Spa nnin g Tree Co ncepts VH-2 402S Spanning Tree P rotocol in a Network Figu re A-1 illu strates the use of th ree VH-24 02S swi tches to esta blish an effec tive Span ning Tr ee config uration . Switche s A, B and C are conn ected tog ether in a redundan t topol ogy (more t han one pa th betwee n two po ints).
9033645-01 Spanni ng Tr ee Con cepts 87 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-2402 S switch de fault sett ings for e ach param eter.
88 Spa nnin g Tree Co ncepts VH-2 402S 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.
9033645-01 Spanni ng Tr ee Con cepts 89 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.
90 Spa nnin g Tree Co ncepts VH-2 402S.
9033645-01 Virtual LANs (VLANs) 91 APPENDIX B. VIRTUAL LANS (VLAN S) VLANs and Frame Tagging The VH-2 402S switc h supports IEEE 802.1Q-comp liant vi rtual LANs (VLAN s).
VH-2402S V LAN Configuration VLAN ope ration on the VH -2402S is e nabled by default. Therefo re, all frames are transferred inte rnally throu gh the switch with a VLAN tag. This tag m ay alread y be o n the fr ame enteri ng the switch , or add ed to the frame by the sw itch.
9033645-01 Virtual LANs (VLANs) 93 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.
94 Virtual LANs (VLANs) VH-2402S 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.
9033645-01 Class of Service 95 APPENDIX C. CLASS OF SERVICE Class of Servic e support on the VH-2402S a llows you to as sign missi on- criti cal data a higher p riority through the switc h by dela ying l ess crit ical traffi c during p eriods of conge stion.
96 Class of Service VH-2 402S 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.
9033645-01 IP Multicast Filtering 97 APPENDIX D. IP MULTICAST F ILTERING 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.
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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 e xtensions, 44 C Class of Ser vice, configuring,.
2 Inde x VH-2 402S priority port configuration, 47 port information, 48 tr af fic cl ass, 4 6 R restarting t he system, 65 S serial port configuration, 19 connections, 1 download, 71 SET operations, 8.
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150524-10 3 R02.
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