Manuale d’uso / di manutenzione del prodotto 9100 del fabbricante 3Com
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® http://www.3com.com/ Super Stack ® II Switch 9 100 User Guide Part No. DUA 1770-5 AAA01 Publ ished Ja nuary 2 000.
3Com Cor poratio n 5400 Bayfr ont Plaza Santa Cl ara, Calif or nia 95052- 8145 Copyri ght © 1 999, 3Co m T echnol ogies . A ll ri ghts reserved . No part o f this do cumentat ion ma y be reproduced i.
C ONT ENTS A BOUT T HIS G UID E T erminolo gy 11 Conventions 12 Related Doc umentation 13 Y ear 2000 Compliance 13 Product Regi s trati on 1 3 1 S WITCH 9100 O VERVIEW About the Switch 9 100 15 Summar.
2 I NSTALLATIO N AND S ETU P Determining the Switch 910 0 Location 25 Configuration Rules for Ether net 26 Installing the Switch 9100 26 Rack Mounting 2 6 Fr ee-St anding 27 St acking the Switch and O.
Connecting to Another Host Using T elnet 46 Confi guri ng Sw itc h IP Parameters 46 Usin g a BOOTP Se rver 4 6 Manually C onfiguring the IP Settings 47 Disco n nect in g a T eln et Sess ion 49 Disa bl.
Spanni ng Sw itches w ith Po rt-Ba sed VLANs 67 T agged VLA Ns 6 9 Uses of T agged VLANs 70 Assign ing a VLAN T ag 7 0 Mixing Port-Based and T agged VLA Ns 7 2 Protoc ol-Ba sed VLAN s 72 Pred efi ned .
Confi guri ng STP on the Switc h 94 STP Configuration Example 96 Displaying STP Settings 96 Disabling and Resetting STP 97 7 Q UALITY OF S ERVICE (Q O S) Overview of Qual ity of Service 99 Building Bl.
Real-T ime Display 117 Remote Logging 11 7 Logging Comma nds 1 18 RMON 119 About R MON 1 19 About the RMON G roups 120 St atistics 1 20 His tor y 120 Alar ms 120 Events 1 21 Benefits o f RMON 121 Impr.
Upgrading BootROM 13 3 Accessing the Bo otROM me nu 133 Boot Option Commands 1 35 A S AFETY I NFORMA TI ON Important Safety Information 138 Lithium Battery 140 L ’ information de Sé curité Importa.
G LOSSARY I NDEX I NDEX OF C OMMA NDS 3C OM C ORPORATION L IMITE D W ARRANTY EMC S TATEM ENTS.
A BOUT T HIS G UIDE This gui de de scribe s the requi r ed inf or matio n to in stall an d co nfigure the Super S tack ® II Switch 910 0 (3 C177 05) . This gu id e is inte nd ed for use by net work ad ministra tors who a re r esp ons ible for install ing and sett ing up net work equi pment.
12 A BOU T T HI S G UIDE Conve ntions T able 1 an d T ab le 2 list co nven tion s th at are used t hrougho ut this g uide. T able 1 Notic e Icons Ic on Notice Type Descri ption In form at ion no te In.
Relat ed Docu mentati on 13 Related Do cum entati on The S witc h 91 00 docume ntat ion se t incl ud es the f ollow ing doc umen ts. T o o r de r ad dition al copi es, c onta ct yo ur sales representat ive .
14 A BOU T T HI S G UIDE.
1 S WITCH 9100 O VE RVIE W This ch apter desc ribes t he fol lowing: ■ Swi tch 9100 feat ur es ■ How t o use the Sw itch 91 00 in you r ne twork co nfig urati on ■ Switch 91 00 f ront vie w ■ .
16 C HAPTER 1: S WITCH 9 100 O VER VIE W ■ Co nt r ols tr af fi c (i nc lu di ng b r oa dc as t s) ■ Pr o vid es extra secu ri ty ■ Pr o toco l-se nsi tive fi ltering for VLANs ■ Respo nds to 802.3x flow- con trol me ssages ■ Auton egoti ation to IEEE 802.
Su mmary of F eat ures 17 100/10 00B AS E-TX por ts are confi gured as M DIX (c r ossove r). A crossov er cab le will ty pical ly be n eeded to conn ect thes e ports to anothe r swit ch. F ull -dupl ex The Swi tch 91 00 provides f ull-d uple x suppo rt f or all po rt s.
18 C HAPTER 1: S WITCH 9 100 O VER VIE W Spa nnin g T re e Pr otoc ol ( STP) The S witc h 91 00 support s the IEE E 802 .1d Spanning T ree Protoc ol (STP), which is a brid ge-b ased me cha nism f or prov iding f aul t tole rance on networ ks.
Networ k Co nfigur atio n Exam ple 19 Figure 1 Switch 9100 used in a bac kbone confi guratio n The S witc h 33 00 on eac h flo or ha s a 10 00 Mb ps f ull-du plex l ink to the Switch 91 00. T wo serve rs on on e fl oor o f the b uildi ng are co nne cted t o the Switch 910 0 b y wa y of two Gi gab it Eth er net lin ks.
20 C HAPTER 1: S WITCH 9 100 O VER VIE W In addi tion t o p r o viding a Gi gabit back bone b etwe en Fa st Ether ne t wor kgroups, Gi gab it Et her n et equ ipped f ile ser ver s and servic es ma y b e directly attache d to the Switch 910 0 providing imp r ove d perfor manc e to the Fas t Eth er net des ktop.
Switc h 9100 Fr ont View 21 W ARNHI NWE IS : RJ-45 Ports . RJ-45-A nsc hlüsse. Dies sind abgesc hirm te R J-45-Dat enbuc hsen. Sie kön nen n icht als T elefon ansch lußbu chsen ve rwen det werde n. An di esen Bu chse n dür fen nur RJ -45- Daten stecker angesc hlosse n w erden .
22 C HAPTER 1: S WITCH 9 100 O VER VIE W Swi tch 9100 Rear View Figu re 3 shows the Swit ch 910 0 rear v iew . Figure 3 Switch 9100 re ar vie w 100/1000B ASE- TX Port St atus L EDs Link/ act ivi ty Green Yell ow Green f lashing Off Link is present ; port i s enable d.
Fa ctory De fau lts 23 The r ear p anel has the f ollowin g featur es: Pow er Soc ket s The S witc h 91 00 has tw o, ful ly redun dant , load- shar ing po we r suppl ies. Both automat ically adjust to the supp ly voltag e. The power suppli es opera te d own to 90 V .
24 C HAPTER 1: S WITCH 9 100 O VER VIE W Sp a nn i ng Tr ee Pr o to c ol Disabl ed for th e swit ch; enab le d for each por t in t he ST P D 802.1p pr iori ty Recogni tion ena bled 802.
2 I NSTA L LA TI ON AND S ET UP This ch apter desc ribes t he fol lowing: ■ How to dec ide wher e to in stal l the Swit ch 9100 ■ Ethe r net c onfig uration rules ■ How to inst all th e swi tch .
26 C HAPTER 2: I NSTAL LATION AND S ETUP CAUT I ON: Wh en using a r ack mo unti ng system , t he swi tch m ust be mounted on a shelf or runn ers. The rack mount ing brack ets alone are not sufficie nt t o sup port the w eig ht of the sw itch . The r ack mo unting bracket s are provide d to ensur e stabil ity ac ross th e hori zontal plan e.
Ins tall ing the Swi tc h 9100 27 T o inst all th e mounting brac kets on th e switch, f ollow th ese steps: 1 Pl ace the swi tch t he right way up on a har d flat surf ac e, wi th th e fro nt fac in g to w ard y ou. 2 Remo ve the exist ing screws from the sides of the chassis.
28 C HAPTER 2: I NSTAL LATION AND S ETUP Stackin g th e S wi tch and Ot her De vic es Up to fo ur un it s c an be pla c ed on to p of on e a not her . If mi xi ng Super Stack II device s, the smalle r units must be p ositioned at the top using rubbe r pads.
Connect i ng E quipment t o the Con sole Por t 29 Figu re 5 shows the pin-o uts fo r a 9 -pin to RS -232 25-pi n null mo dem cable . Figure 5 Null modem cable pin- outs GND (groun d) 5 - DSR (dat a se.
30 C HAPTER 2: I NSTAL LATION AND S ETUP Figu re 6 shows t he pin -ou ts for a 9-pi n to 9- pin P C-A T s eria l null m odem cable . Figure 6 PC-A T serial c able pin- outs Powe ring-up the Sw itc h The Swit ch 9100 contain s two power supplies. When both ar e conne cte d, the pow er su pplie s opera te in a l oad- shar ing c onfi guration .
Loggi ng on for the Fi rst Time 31 I f the swi tch passes the POST , the MGMT LED stops bli n king an d r emains gr een. If the switch fails t h e POST , the MGMT LED shows a sol id yellow lig ht . Logging on for the Firs t Time After t he swi tch has com pleted the POST , it is oper ationa l.
32 C HAPTER 2: I NSTAL LATION AND S ETUP.
3 A CCESS ING THE S WITCH This chap ter provide s th e fo llowing requi r ed info rm ation to begin manag ing t he S witc h 91 00: ■ Un de rsta ndi ng t he co mma nd sy nt ax ■ Line- edi ting com .
34 C HAPTER 3: A CCESSING THE S WITCH Unde rstan di ng the Comma nd Synta x This s ection descr ibes th e steps to take when enter ing a command. R efer to th e sect ions t hat follow f or de ta iled in forma tion o n us in g the command- line inter face.
Unders tandi ng the Comm and S yntax 35 Ab breviated Syntax Abb r ev iated syn tax is the shortest , m ost unam bi guous, a llow able abbrevia tion of a co mm and o r pa ramet er .
36 C HAPTER 3: A CCESSING THE S WITCH Sym b ol s Y ou may see a v arie ty of sy mbo ls show n a s par t of the comm and s ynt ax. These sym bols ex pl ain how to enter the co mman d, an d yo u d o no t typ e th em a s pa rt o f th e co m ma n d i t se lf.
Line- Editi ng Keys 37 Line-Editing Keys Ta b l e 8 de scribe s the line-edi ting k eys avai labl e using the C LI. Comma nd Hist ory The swit ch “r emembers ” the last 4 9 commands you have enter ed.
38 C HAPTER 3: A CCESSING THE S WITCH cre at e vla n <n am e> Creates a VLAN. conf ig a cco un t <use rn ame> {e ncry pted} {<pa sswo rd> } Conf igures a u ser acco unt passwor d. Passw ords m ust have a minimum of f our charac te rs and can hav e a maximum of 12 charac ters.
Com m on Com m a nd s 39 ena bl e idl et im eo ut Enab les a ti mer th at disc onnects all ses sions (both Te ln et and cons ole) a fter 20 minut es of inact ivit y.
40 C HAPTER 3: A CCESSING THE S WITCH Config uring Ma na geme nt Ac cess The S witc h 91 00 support s the follo wing t wo l evel le vels of man age ment : ■ User ■ Admi ni stra tor A user -level a.
Confi guring Mana gement Ac cess 41 If an aster isk (*) a pp ears in f ront of the comm an d-line p rompt, i t i ndicat es that y ou h ave ou tst anding co nf igurati on cha ng es th at hav e no t been saved . F or example: *3C1 77 05 :19 # For m or e info rmati on on sa v ing c onfigur ation chan ge s, re fer to Chap ter 10 .
42 C HAPTER 3: A CCESSING THE S WITCH T o add a pa sswor d to the de fault user ac count, f ollow th ese steps : 1 Log in to the s witch usi ng the name admi n . 2 At th e passw ord prompt, p r ess [R etu rn], or e nter t he passw ord tha t you have c onf igured f or t he adm i n a cco unt.
Meth ods of Managi ng the Swi tch 9100 43 Del et ing a n Ac count T o del ete an account , you must have ad ministrat or pr ivile ges. Use the followi ng co mm an d to d elet e an a ccoun t: dele te a cco un t <use rn am e> The acco unt name admi n ca n not be dele ted .
44 C HAPTER 3: A CCESSING THE S WITCH The most common applic ati ons that u se access pr ofi les allow y ou to r em ote ly manage the switch ac ro ss the n etwork, fo r exampl e: ■ SNMP r ead access.
Using Access Profi les 45 The su bnet mask speci fied in th e access pr ofile command is int erpr eted as a re v e rse m as k . A rev ers e mask indicates the bit s that ar e si gnific ant in the I P addre ss .
46 C HAPTER 3: A CCESSING THE S WITCH T o vi ew the T e lne t confi gura tion, t ype: show m an age me nt Using T elne t Any workst ati on with a T elnet f acilit y should b e able to communi cate with th e switch ov er a TCP/IP netwo rk. Up to ei gh t active T elnet sessi ons ca n ac cess t he sw itch c onc urrently .
Using Te lne t 47 ■ Su b ne t a ddr ess mask (o pt iona l) The swit ch MAC addr ess is found on th e rear label of the switch . Once t his is do ne, th e IP ad dr ess an d subn etwork mask for t he switch wil l be downlo aded aut omatical ly . Y o u c an then sta rt managi ng the swit c h wi tho u t fu rth er co n fig u rat io n.
48 C HAPTER 3: A CCESSING THE S WITCH T o m anual ly conf igure t he IP se ttings, p erfor m the follo wing st eps: 1 Co n ne ct a t erm in a l o r wo rks t at io n run n i ng te r mi na l -em ul at io n so ft wa re to th e con so le po rt . 2 At your termin al, press [R etur n] one or more times until you see the login prompt.
Using Te lne t 49 For exa mple: conf ig i pro ut e add de fa ul t 1 23 .4 5.67 .1 7 Save y our conf igurati o n change s so that they wil l be in ef fect after the next sw itc h reboot, by typi ng save For m or e info rmati on on sa v ing c onfigur ation chan ge s, re fer to Chap ter 10 .
50 C HAPTER 3: A CCESSING THE S WITCH IP H ost Config uration Comma nd s Ta b l e 1 2 describ es the c ommands that ar e u sed to confi g ur e IP s etting s on the switch .
Using SNMP 51 The d e fault h ome page of the sw itch ca n b e ac cesse d using the fol lowi ng comman d: http :/ /< ipa dd re ss> When you access the home pag e of the switc h, you ar e p r esented with th e Lo g on scre en . Fo r m or e in fo rm at i on o n u s in g t he Web I nte r fa c e, ref e r t o Ch ap te r 9 .
52 C HAPTER 3: A CCESSING THE S WITCH Conf igu rin g SNMP Settin gs The f ollow ing S NMP par amet ers c an be c onf igured o n the swi tch: ■ Aut hori zed t ra p r ece ive rs — An authorized trap r ec eiver can be one or mo r e n etwor k man age ment stations on y our n etwor k.
Using SNMP 53 Disp layi ng S NM P Settin gs T o disp lay the SNMP s etting s config ur ed on the s witch, enter t he followi ng co mm an d: show m an age me nt Th is co mm an d di sp lay s th e fo llo.
54 C HAPTER 3: A CCESSING THE S WITCH ■ Logi n stati stics ■ Acce ss profile assignm ent s Rese tt ing a nd Dis a b lin g SNMP T o r eset and dis able SNMP sett ings, u se the com mands in Ta b l e 1 4 . Check ing Ba sic Connec tivity The switc h of fers the pi ng comm and for checki ng basic conne ctivi ty .
Enabl ing a nd Disabl ing Switch 9100 P orts 55 En ab ling a n d Disa blin g Swi tch 9 100 Po rts By de fau lt, all ports are enab led. T o ena ble or disabl e one or m ore por ts, use the follo wing .
56 C HAPTER 3: A CCESSING THE S WITCH Flow C ontr ol Flow c ont rol is supp orted on G iga bit Ether ne t por ts. It i s ena bled or disabl ed as part of a utone go tiation . If au tone goti ation is set t o off, f low control is disabl ed. When au tone gotia tion is tu rned on, flow cont rol is enabled .
Switch 9100 Po rt Co mmands 57 dis ab le le ar ni ng p or ts < por tl is t> Disa ble s MAC addre ss lear ning on one or more ports for se cur ity purpos es. If MAC addres s learn ing is dis abled, only br oadcast tr affi c and pac kets desti ned to a perman ent MAC address mat ch ing t hat po rt numb er, are forwarde d.
58 C HAPTER 3: A CCESSING THE S WITCH Load Shar ing on th e Sw it ch 9 1 00 Load sh aring wi th Sw itc h 9100 de vice s al lows y ou t o inc r ease bandwi dth and resilienc e betwee n switch es by usi ng a g r o up of p orts t o ca rry traff ic i n parallel b etwe en switches.
Load Shar ing on the Swi tc h 9100 59 ■ All other packet s — Uses the sou rce and destin ation MA C address. ■ Round- robin — W hen t he sw itch rece ives a s tream of pac kets, it for ward s one pack et out of each physic al port in the load -shari n g group using a r ound -rob in sch eme.
60 C HAPTER 3: A CCESSING THE S WITCH I t is rec ommended th at you c onfig ur e the same dupl ex and speed settings f or a ll por ts in a load-sh aring group. Do not disabl e a por t th at is pa rt of a lo ad-sha ring group . Disa bling t he port p re vents it from fo rwardi ng tr affic , but s till all o ws the l ink to i nitial ize.
Swit ch 9100 Por t-Mir rori ng 61 Port-Mirroring Command s Sw i tc h 9 100 port -m ir ro ri n g co mm an ds a r e de scr ibe d in Ta b l e 1 7 . Switc h 9100 Port-Mirroring Exam ple The foll o wing ex.
62 C HAPTER 3: A CCESSING THE S WITCH.
4 V IRT UAL LAN S (VLAN S ) Setti n g up Vir tual L ocal Ar ea Networks (VLANs) o n the s witch ea ses m any time-co nsum ing ta sks of netw ork administ ratio n while increasin g efficie ncy i n net wor k oper ati ons. This c hapter d escribes the concept of VLANs and expl ains how to i mplement VL ANs on the switc h.
64 C HAPTER 4: V IRTUAL LAN S (VL AN S ) ■ VLAN s ease th e c han ge an d m ovem en t of d evi ces . W ith t radit ional ne tw orks, netwo rk ad ministr ators sp end m uc h of thei r ti me dealing wit h moves an d changes. If user s move to a dif fe re n t subnet wor k, t he addresses of ea ch e ndstation mu st be upda ted manual ly .
IGM P Ove rview 65 the swit ch is conf igured to perfor m IGMP snoop ing and th ere is no othe r r eli able quer ier on the netw ork. IGMP c onf i gu ra tio n co mman ds ar e des cr i be d in Ta b l e 1 8 . T able 18 IGMP Configuration C ommands Command Desc ription ena bl e igm p {v la n <n am e> } En a bles I GMP .
66 C HAPTER 4: V IRTUAL LAN S (VL AN S ) T y pes of VLA Ns The switc h suppo rts a max imum of 256 V LANs. VLANs c an be created acc or ding to th e follo wing cr iteria: ■ Phys ical por t ■ 802.
Types of VLANs 67 For exa mple, in Figur e 7, the VLANs ar e co nfigur ed as fo llows: ■ Port s 1 and 3 ar e p art o f VLAN Sales ■ Port s 2 and 5 ar e p art o f VLAN Market ing ■ Port s 4 and 6.
68 C HAPTER 4: V IRTUAL LAN S (VL AN S ) Figu re 8 ill u strat es a s ingle V LAN that spans t wo Swit ch 9100 devices. All port s on both swi tches be long to V L AN Sale s . The two swit ches ar e conne cte d u sing p ort 1 on S wi tch 1, an d po rt 6 on Swi tch 2.
Types of VLANs 69 Figure 9 T wo port-based VL ANs spanning tw o Switch 9100 devi ces VLAN A cco unti ng span s Swit ch 1 and Switch 2 by way of a connec ti on betw een Switch 1, por t 1 and Sw itch 2, p ort 3 . VLAN Engi nee ring spa ns Swi t ch 1 an d Sw itc h 2 by wa y of a con ne ct io n be tw een Swi tch 1, po rt 5, and Sw it ch 2, p ort 6.
70 C HAPTER 4: V IRTUAL LAN S (VL AN S ) Use s of T agge d VLAN s T agg ing is mo st c ommon ly use d to allow VL ANs to sp an sw itche s. The switc h-to-sw itc h conne ction s a r e t ypica lly ca lled tr u n ks . Usi ng tags, multi ple VLA Ns can span mul tiple swi tches usi ng o ne or more trunk s.
Types of VLANs 71 Figur e 10 Physical diag ram of ta gged and untagged traf fic Figu re 11 sho ws a l ogical diagr am o f the sa me net work. Figur e 11 Logical diagr am of tagged and untagge d traf fic Switch 1 Switch 2 = Marketing = Sales M S = Tagged port 802.
72 C HAPTER 4: V IRTUAL LAN S (VL AN S ) In Figu re 10 and Figu re 11 : ■ Th e tr un k p or t on ea c h sw it ch ca rrie s tr a ffic fo r b o th V LA N Mark eting and VL AN Sales . ■ The t runk port on each sw itch i s ta gged . ■ The ser ver connec ted to por t 1 on Switch 1 has a NIC that su pports 802.
Types of VLANs 73 Figur e 12 Pr otocol-based VLANs Pr ed efi n ed P r otoc ol F il t ers The foll o wing pr otocol fi lte rs are p red efin ed on the s witch : ■ IP ■ IP X ■ NetBI OS ■ DECNet ■ IPX_80 22 ■ IPX_SNAP ■ AppleT alk 91_008 = IP traffic = All other traffic 1 Finance Personnel My Company 192.
74 C HAPTER 4: V IRTUAL LAN S (VL AN S ) De fin ing P ro toc ol F ilt ers If nece ssary , you c an d efine a c ustomized protoco l filte r base d o n EtherT ype, L ogica l L ink Con trol (LLC) , a nd/or Subn e twork Ac ce ss Protoc ol (SNAP). Up t o six protocols m a y be part of a protoc ol f ilter .
VLAN Na mes 75 For m or e info rmati on on S NA P for Et herne t protoc ol types, see TR 1180 2-5:1997 ( ISO/IEC) [ANSI/I EEE std. 802 .1H, 1997 Edit ion]. Deletin g a Protoc ol F ilter If a pr otoc ol filter is deleted from a VLAN, th e VLAN is assign ed a protoco l filt er of none .
76 C HAPTER 4: V IRTUAL LAN S (VL AN S ) Con figuring V LAN s on t he Swit c h This section d escribes the c om mand s associat ed with setting u p VLAN s on the switc h. Configurin g a VLAN involves the fo llowing steps: 1 Cre at e and na me the VLA N.
Confi guring VLANs on the Swit ch 77 VLA N Conf igur ati on Exam p les The foll o wing Swit ch 9100 exampl e cr eates a po rt-ba sed VLAN named acco unt ing , assigns t he IP address 13 2.15 .121.1, and a ssign s port s 1, 2 , 3, an d 6 to it: crea te v lan a cc ount in g conf ig a cco un ti ng i pa dd re ss 13 2.
78 C HAPTER 4: V IRTUAL LAN S (VL AN S ) The foll o wing Swit ch 9100 exampl e cr eates a VLAN named sa l es , wi th the V LANid 120 . Th e V LAN use s b oth ta gged and unt agged po rts. Po rts 1 thr o ugh 3 ar e t agged, and p orts 4 a nd 7 ar e untagged.
Delet ing VL ANs 79 ■ Ports assigned ■ T agge d/u nt ag ged s ta tus fo r ea c h po rt ■ Ho w t he por t s w er e a dd ed t o the V LAN (ma nua lly or by GVR P) T o d isplay prot ocol info rmati.
80 C HAPTER 4: V IRTUAL LAN S (VL AN S ).
5 F ORWAR DING D ATABA SE (FDB) This ch apter desc ribes t he c ontent s of th e fo rwarding database (FDB ), how the FDB works, and h ow t o c onfigure the FDB . Ov er vi ew o f t he FDB The swit ch maintains a da tabase of all media access c ontr ol (MAC) addr esses re ceived on all o f its p orts.
82 C HAPTER 5: F ORWARDING D ATABASE (F DB ) way of th e command-li n e int erface ar e stor ed as p ermanent . The swit ch can sup port a maxim um of 64 perman ent entri es. Once cr eated, pe rmanent ent ries stay th e same as when th ey wer e cr eated .
Confi guring F DB Entr ies 83 Config uring FDB En tr ies T o con figure e ntrie s in the F DB, use the co mm ands li sted in Ta b l e 2 1 . FDB Co nfi gura tion Exam p les The foll o wing ex ample add.
84 C HAPTER 5: F ORWARDING D ATABASE (F DB ) ■ Port number fo r thi s devi ce is 4. This ex ampl e as sociat es the QoS pr o file qp2 with a dynamic en try that will be l ea rn ed by t he FDB : crea.
Remov ing F DB E ntries 85 Removin g FD B En tr ies Y ou can re move on e or mo re spe cific entries from th e FDB , or yo u c an clear the entir e FDB of all en tries b y using the commands listed in Ta b l e 2 2 .
86 C HAPTER 5: F ORWARDING D ATABASE (F DB ).
6 S PANN ING T RE E P RO T O C O L (S TP) Using the Spanning T r ee Protocol ( STP) f unction ality of t he switch makes your netwo rk m ore faul t to lerant . The foll owi ng sec tion s expla in m ore about STP and the STP feat ur es supp orted by the Swit ch 9100.
88 C HAPTER 6: S PANNING T REE P ROTO COL (STP ) Figur e 13 Network with an il legal topology This c onfigur ation is illega l because it crea tes loo ps that caus e the networ k to overl o ad.
Overvi ew of t he Span ning Tree Protoco l 89 If the l ink th r ough Br idge C fails, a s shown in Fi gu r e 15 , the STP s ystem r ec onfigure s the netw ork so tha t tra f fic f rom segm ent 2 fl ows t hrough Bridge B.
90 C HAPTER 6: S PANNING T REE P ROTO COL (STP ) The R oot Bridge ge ner ates B PDUs o n all po rts at a regu lar int erval known as t he Hello T im e.
STP C onfigurat ions 91 Ca re must be taken to ensure th at multiple STPD inst ances with in a single switc h do not see ea ch ot her in the same broadc a st dom ain. Thi s co uld happ en if, for ex ampl e, anot her ex ternal bridge is used to c onne ct VLANs belon ging to separat e STPDs.
92 C HAPTER 6: S PANNING T REE P ROTO COL (STP ) Figur e 16 M ul tiple Spanning T ree Domains When the swi tches i n this co nfigurati on star t up, STP co nfigur es eac h STP D suc h that th ere ar e no activ e loops in the top ology . STP could conf igur e the topology in a number of way s to make it loop-fr ee.
STP C onfigurat ions 93 Figur e 17 T a g-based ST P configurat ion Th e t a g- bas e d n etw o rk in Figure 17 has t he f ollow ing con figu ratio n: ■ Switch 1 c onta ins V LAN Market ing and VLAN Sales . ■ Switch 2 c onta ins V LAN Engine er ing and VLAN Sales .
94 C HAPTER 6: S PANNING T REE P ROTO COL (STP ) Config uring STP on th e Sw it ch STP conf igurati o n involv es the fo ll owing actio ns: ■ Cre ate one or mor e STP domains u sing the fol lowing command: crea te s tpd < st pd_n am e> STPD, VL AN, and QoS profile names must al l be unique .
Confi gurin g STP on the S witch 95 Ta b l e 2 3 sho ws the co mmands us ed t o co nfigur e STP . T able 23 STP Configur ation Commands Command Desc ription cre at e stp d <s tp d_ na me > Create s an STPD.
96 C HAPTER 6: S PANNING T REE P ROTO COL (STP ) STP Co nfigura ti on Exam ple The follo wing example cre ates and enables an STPD named B ackbon e_st . It assigns the Ma nufa cturing VLAN to the STP D. It disa bles STP on por ts 1 through 3, an d po rt 6.
Dis ablin g and Resettin g STP 97 T o disp lay the STP s tate o f a port, u se the fo llowing command: sho w stpd <s tpd_ na me> po rt <portl ist> Th is co mm an d di sp lay s th e fo llo .
98 C HAPTER 6: S PANNING T REE P ROTO COL (STP ).
7 Q UAL IT Y OF S ER VICE (Q O S) This ch ap ter de scribe s the conc ept of Qu ality of S ervic e (Q oS) and expla ins h ow t o conf igure Q o S on t he sw itch. Ov er vi ew o f Qua lit y o f S erv ice QoS i s a feature of the Sw it ch 910 0 tha t allows you to spe cify different ser vice le vels fo r traf f ic travers ing th e swit ch.
100 C HAPTER 7: Q UALITY OF S ERVICE (Q O S) The nex t sec tions desc ri be how QoS pr ofil es are used and modi fied. After this, vari ous traffic grouping s a re expla ined and Q oS prof iles are a ssigned to th e tra ffi c g roup ing s. Qo S Pr o fil es Ei ght d efaul t QoS p ro files ar e pr ovi ded th at c an be m odified , but n ot delet ed.
QoS Pro fil es 101 A QoS p ro file d oes not alt er the beh avior of t he swit ch un til it i s assi gned to a t raff ic gr oupin g. The sett ings of t he default p ro files are sh own in Ta b l e 2 5 . Modif yin g a QoS Profile Y ou can m odi fy t he p r o file de fau lts as de sired.
102 C HAPTER 7: Q UALITY OF S ERVICE (Q O S) Th e Bla ck h ole Qo S Prof ile In the desc riptio n o f various opt ions for co nfig uring P oli cy-B ased Qo S, ther e is an opti on to spe cify blac kh ole in place of a nam ed QoS profi le.
Traf fic Groupi ngs and C rea ting a QoS Policy 103 MAC-B ased T raf fic Gr oupi ng s QoS profiles can be a ssigned to dest ination MA C add r esses. T he variou s optio ns th at fall in to this categ.
104 C HAPTER 7: Q UALITY OF S ERVICE (Q O S) The c ommand to cl ear the F DB is as fol lows: clea r fd b Bla ckh ole Using the blackh ole option con figu res the sw itch t o n ot fo rward any pac kets to t he desti nation MAC addr ess on any ports f or th e VLAN specified.
Traf fic Groupi ngs and C rea ting a QoS Policy 105 802.1p Pa ck ets When t raf fic th at co ntains 802.1p priorit iz ation bi ts is s een, the tr aff ic i s mapp ed t o the eight def ault Q oS p rofiles . No use r conf igur ation is r e q ui r ed for t his ty pe of tr affi c g rou pi ng .
106 C HAPTER 7: Q UALITY OF S ERVICE (Q O S) Sour ce P ort A s ou rce po rt tr affi c g rou pi ng im pl i es th at an y tra ffi c s ou rced fro m th is physi cal por t uses t he i ndicat ed Q oS profile whe n the tra ffic is transm itted out a ny other port.
Verif ying Conf igura tion and Pe rforman ce 10 7 V erify ing Config uration a nd Per for m an ce The foll o wing in formati o n is u sed to veri fy th e QoS config uratio n and monit or the u se of the Qo S policie s that ar e i n place.
108 C HAPTER 7: Q UALITY OF S ERVICE (Q O S) Q oS m oni t o r sa m pl ing is c on fi gu r e d as f oll ows : ■ The po rt i s mo nito r ed for 20 seco nds b efore the swi tch m oves on t o th e n ext po rt i n t he l is t. ■ A port is sampl ed for five secon ds before th e pack ets per second (pp s) value is d isplayed on the scre en .
Configu ring QoS 109 ■ For p hysica l and logi cal grou pings of a source p ort o r VL AN, re-ap ply the Qo S profile t o the sou rce por t or Vlan . Y ou ca n also sa ve and r eb oot t he swi tch. Config uring QoS Ta b l e 2 9 de scri bes the co mm ands u sed t o co nfigure QoS .
110 C HAPTER 7: Q UALITY OF S ERVICE (Q O S).
8 S TATU S M ONITORIN G AN D S TATIS TI CS This c hapt er descr ibes how to vi ew the curr ent oper ati ng status o f the swit ch, how to disp lay info rmation in the log, an d how to take advant age of avail ab le Remote Mo nitori ng (RMON) capab ilities.
112 C HAPTER 8: S TATUS M ONI TORI NG AND S TATI STICS Ta b l e 3 0 desc ri be s show co mm ands t hat are used to monitor the status of th e s wit ch . T able 30 Status Monitoring Co mmands Command Des cript ion show log {< pr io rity >} Disp lays t he cur rent s napshot of th e l og.
Por t St ati s ti cs 113 Por t St atis tic s The Switch 9 100 pro vides a facili ty fo r viewin g port st atis tic info rmati on. The summary i nformatio n li sts value s f or t he cur ren t c ounter agains t eac h port on eac h op erat ional mo dule i n the sys tem, and it is refreshed approxim ately e v ery two se conds.
114 C HAPTER 8: S TATUS M ONI TORI NG AND S TATI STICS Po rt E rror s The swit ch keeps track of er r ors for each por t. T o v i ew por t tr a nsm it e rror s , us e th e f o ll ow i ng co m ma nd : .
Po rt M oni tori ng Di spl ay K eys 115 ■ Rece ive A lign men t Errors (R X Al ign) — Th e total num ber of fr ame s r ec ei ved by the por t that oc curs if a fr ame has a CR C err or an d does not c onta in an i nte gral n umb er o f octe ts.
116 C HAPTER 8: S TATUS M ONI TORI NG AND S TATI STICS By def ault, lo g entries t hat ar e assi gned a cri tical or warn ing level r em ain in th e log aft er a swit ch r eboot .
Loggi ng 117 Real- Time Dis p lay In addi tion t o v iewing a sna psh ot of the log, y ou ca n c onfigure t he system to m aintain a r un ning real-time display o f log messa ges o n the consol e.
118 C HAPTER 8: S TATUS M ONI TORI NG AND S TATI STICS L oggin g Command s Th e com ma nds de sc ri be d in Ta b l e 3 4 a llow yo u to c onf igure loggi n g options, reset l oggin g op tion s, displa y the l og , and cle ar the l og .
RM O N 11 9 RMON Using th e Remote Monitori n g (RMON) capab ilities o f the switch allows netwo rk ad minist rato rs to i m pr ove syst em ef fici en cy and r educ e the l oad on the netwo rk. The f ollow ing se ctions expl ain mo re ab out t he RM ON co ncep t and t he RMO N fea tures supp or ted by t he sw it ch.
120 C HAPTER 8: S TATUS M ONI TORI NG AND S TATI STICS About the RMON Gr oup s The I ETF de fine s nine groups o f Ethe r ne t RM ON sta tisti cs. Th e switch suppor ts the fol lowi ng fou r of t hese groups: ■ Stati stics ■ History ■ Alarms ■ Even ts This se ction d escribe s these g r oups, and d iscusse s how the y can be u sed.
RM O N 12 1 Events The Ev ents gr oup crea tes entries in a n event l o g and/or sen ds SNMP t raps to t he management wo rkstati o n. An even t is tr igger ed by an RMON alarm.
122 C HAPTER 8: S TATUS M ONI TORI NG AND S TATI STICS An RMO N probe, h owe ver , aut onomou sl y looks a t the ne two rk on be half of the mana gem ent wor kstati on witho ut affecting t he charac teristics and perfor man ce of the netw ork .
RM O N 12 3 When using the RMON fea tures of the switch, you shoul d note the fo llo wi ng : ■ After the defa ult sessions a re cre at ed, the y hav e no spec ial status. Y o u can delet e or ch ange t hem a s required. ■ The gr eater t h e n umber of RMON sessio ns, the gr eater th e bur den on the ma nag eme nt resources of the swi tch.
124 C HAPTER 8: S TATUS M ONI TORI NG AND S TATI STICS.
9 U SING THE W EB I NTERFACE The W eb In terfac e is devi ce-ma nagement so ftwa re run ning in the swit ch that allows you to access th e switch over a TCP/IP net work, usi ng a standa r d Web browser . An y properly c on figured stand ard Web browser that su ppo rts frame s an d Java Script (such as Ne tscape Nav igator 3.
126 C HAPTER 9: U SING THE W EB I NTERFACE Setting U p Y our Browser In gene ra l, the def ault set ting s that c ome c onf igured o n y our browse r work wel l with th e W eb Interf ace.
Nav ig ati ng th e We b I nte rf ac e 127 If you h ave ent ered th e name an d passw o r d of an a dm inistrator -leve l acco unt, y ou have ac cess t o al l Web Int erf ace pa g es. If y ou have us ed a user -le vel a ccoun t n ame a nd password, you on ly have acce ss to t he Stati stics and Sup port in formati on.
128 C HAPTER 9: U SING THE W EB I NTERFACE Cont ent Fr ame The conten t frame c ontains t he main body of i nformation in the Web I nterface. F or example, if you sel ect an optio n fro m the Conf igurat ion task b utton , ent er c onfigur ation par ame ters i n the cont ent frame .
Savi ng Chang es 129 Saving Change s There are tw o wa ys to save yo ur ch ange s to n on- volat ile st orage using the W eb Inter face: ■ Sel ect Save C onfigur ation from the Co nfigurat ion task bu tton, Switch option.
130 C HAPTER 9: U SING THE W EB I NTERFACE.
10 S OFTWAR E U PG RADE AND B OOT O PTION S This ch apter desc ribes t he procedure f or upg rading th e swi tch soft ware i mage. This chapter a lso disc usses how to save and load a pri mary and secon dary image an d c onfigur ation fil e on the swit ch.
132 C HAPTER 10: S OFTW ARE U PG RADE AND B OOT O PTIO NS The sw itch c an sto r e u p to tw o ima ges; a prim ary an d a sec ondar y . Wh en you downlo ad a new image, you must select i nto whic h image space (prima ry or seco ndar y) you w ant the new i mage t o b e pl aced.
Upgradi ng and Access ing BootR OM 13 3 T o use t he configur ation, use the fol lowing command: use con fig urat io n [pri ma ry | seco ndar y] The confi gura tion takes ef fect on the nex t rebo ot. If the sw itc h is r eboo ted while i n the mi ddle of a c onfig ura tion save, t he switc h bo ots to facto ry de fault se ttings.
134 C HAPTER 10: S OFTW ARE U PG RADE AND B OOT O PTIO NS T o acc ess the Boo tROM menu, fo llow t hese step s: 1 At tach to th e co nsol e po rt of t he s w itc h, as d es cr ibed i n Ch apter 2 .
Boot Opt ion Comman ds 135 Boot O ption Comma nd s Ta b l e 3 8 lists th e co mman ds assoc iated wi th switch b oot option s. T able 38 Boot Opt ion Commands Command Des cript ion show c on fig ur at ion Disp lays th e cu rren t conf ig ura tion to t he te rminal .
136 C HAPTER 10: S OFTW ARE U PG RADE AND B OOT O PTIO NS.
A S AFE T Y I NFORMAT ION Y ou must read t he fol lowin g saf ety in form ation b efo r e c arryi ng out a ny install ation or remova l of comp one nts, o r an y m aintena n ce proce dures on the Switch 910 0. WARNI NG : War ning s co ntain di recti ons that yo u m ust follow for your per sonal safet y .
138 A PPENDIX A: S AFETY I NFORMATION Important Safe ty In formati on ■ Install ation and remo val of th e uni t mu st be car ried ou t by q ua lifie d pers onnel o nly .
Imp or ta n t Sa fe t y Info rm at io n 139 ■ This un it op erate s under S EL V (Saf ety Extra L ow V olta ge) c ond itions acco r d ing to I EC 9 50. The condi tion s are only m a intaine d if the equipm e nt to which it is conne cted a lso oper ates u nde r SE L V condi tion s.
140 A PPENDIX A: S AFETY I NFORMATION If service person ne l disregard the instructi ons and at tem pt to replac e the bq4830 /DS 16 44, replace t he l ith ium b attery with t he sa m e or e quival ent type, as r ecommended by the ma nufactur e r .
L’i nfor mat ion de S écur ité Import ant e 141 L ’ informa tion de Séc uri té Impo rtan te ■ L' install ati on et la dépo se de ce gr o upe doiv ent êt re c onfié s à un pers onnel q ua lifié.
142 A PPENDIX A: S AFETY I NFORMATION ■ La pris e secteur d oit se t ro uver à pr oximi té de l’ap par eil et s on accès doit être fac ile. V o us n e pou ve z m ettre l’ap pa r eil ho rs circui t qu'e n débran chant so n cor don élec triq ue au niveau de cett e prise.
L’i nfor mat ion de S écur ité Import ant e 143 Bat ter ie au l it hium Les b atterie s du disposit if bq483 0/DS 1644 est h ermét ique men t scellé e t ne peut donc pas êtr e remplacé par l'ut ilisateur .
144 A PPENDIX A: S AFETY I NFORMATION Wic hti ge Sicherh eitsinf orma t ion en ■ Die Instal lation und der Ausbau des G erät s dar f nur durch Fach per sona l e rfolge n .
Wi chti ge Sicher hei tsi nform atio nen 145 W ARNHI NWE IS : RJ-45 Ports . RJ-45-A nsc hlüsse. Dies sind abgesc hirm te R J-45-Dat enbuc hsen. Sie kön nen n icht als T elefon ansch lußbu chsen ve rwen det werde n. An di esen Bu chse n dür fen nur RJ -45- Daten stecker angesc hlosse n w erden .
146 A PPENDIX A: S AFETY I NFORMATION ■ Lit hiumba tterien sind ke in von der EP A au fgelist eter Sondermü ll und k önn en dah e r in de r Re gel mi t de m normal en M üll e ntsor gt wer d en. ■ Bei de r E ntsor gung größ erer M engen i st di e ör tlich e Mül l ver wal t ung ss tell e zu Ra te zu zi ehe n.
B T ECHN ICAL S PE CIFICATIONS *Categ ory 5 sc reen ed or unsc r eened cables must be us ed to ensu re complian ce with th e Class A r equir emen ts of this s tandar d. Phys ical Dimensions Height: 89mm (3. 5 in.) x Wid th: 440mm (17. 3 in.) x Depth: 472mm (18.
148 A PPENDIX B: T ECHNICAL S PECI FICATIONS The f ollow ing is a list o f softw ar e st andards s uppo rted b y the Swi tch 9100. For m ore info rmati on on d rafts o f the 8 02. 3 M AU MIB + gi gabit and the Ether - like M IB + gi gabit, r ef er to: http :/ /w ww.
C T R O UBLESH OOTIN G If you e ncou nt er p r ob lems w hen using the sw itch, th is a ppend ix may be helpf ul. If y ou have a p r obl em no t lis ted he re or in the “Rele ase Not es,” contac t y our su ppli er .
150 A PPENDIX C: T ROUBLESHOOTING Swi tch does no t power up: The Switch 9100 u ses a digi tal power su pply wit h su rge pr otec ti on. I n the event of a pow er su rge, the prot ection circuits shut d own t he p owe r supply . T o reset, unplu g the switc h for 1 m inut e, plug it bac k in , and attem pt to po wer up th e switch .
Using the Command-L ine Inter face 151 attem pt to lo g in and th e maximum number of T elnet s essio ns ar e bein g used, you sho uld recei ve an e rror me ssage i ndic ating so.
152 A PPENDIX C: T ROUBLESHOOTING Y ou forg e t y our p asswo r d and ca nn ot l og in: I f you ar e not an admin istr ator , anothe r user h aving ad ministrat o r acces s l evel can lo g in, delete your user name, an d creat e a new user name for you, w ith a new p assword.
Using the Command-L ine Inter face 153 A mismatch o f duplex mode bet ween the Swit ch 9100 and th e network devic e w ill ca us e poo r net wor k per fo rman ce. View ing u sin g the show port rx command on t he Switc h 9100 may display a co nstant in crement of CRC er rors .
154 A PPENDIX C: T ROUBLESHOOTING which shou ld no w a llow you to re-ent er the p r evio us co mm and wi thou t err or as foll ows: loca lh os t:2 6 # conf ig v la n r ed a dd p or t 1,2 VLAN names: Ther e ar e res tri ctio ns on VLAN names.
Using the Command-L ine Inter face 155 STP Y ou have co nne cted a n e nds tation direct ly to th e sw itch and the end station fai ls to b oot correctly: The Swit ch 9100 has STP en abled, and the end stat ion is bo oting befo re the ST P initi alizati on pr ocess is c omplet e.
156 A PPENDIX C: T ROUBLESHOOTING.
D T ECHN ICAL S UP PORT 3Com provide s eas y ac cess t o techn ica l supp ort inf or mat ion throug h a vari ety of serv ices. This ap pendi x descr ibes th ese serv ices. Infor mation co ntained in this appendi x is co rrec t at time o f publica tion.
158 A PPENDIX D: T ECHNICAL S UPPOR T 3C om F T P S it e Do wnlo ad drivers, patches , software, and MIB s across the In ter net from the 3Com publi c F TP sit e.
Suppor t from Your Net work Suppl ier 159 Acce ss by Dig ita l M o dem ISDN users ca n dial in to th e 3Com BB S using a di gital mo dem f or f ast access up t o 6 4 Kbp s.
160 A PPENDIX D: T ECHNICAL S UPPOR T When you co ntact 3Com for assista nce, have the f oll owing i nfor mat ion r eady: ■ Product m odel nam e, pa rt num ber , and serial num ber ■ A list o f sy.
Retu r ning Pr oduc ts for Re pair 161 Retu rni ng Products fo r Rep air Before you se nd a p roduct directly to 3 Com fo r repair , y ou must fir st obtai n an a utho riz ation n um ber . Products sent to 3Com w ith out author iza tion num be rs w ill b e return ed t o the send er u nopen e d, at th e sender ’ s expe nse.
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G LOSSARY 10B A SE- T T he IE EE spe cific ation for 1 0Mbps E ther net over Cat egor y 3 , 4 or 5 twist ed pa ir cable . 100B A SE-F X The IEEE specif icatio n for 100 Mbps Fast Et hernet over fib er -optic c able. 100BA SE -TX The IEEE specif ica tion for 100Mb ps Fast Ethernet o ver Category 5 t wis te d- pai r ca ble .
164 G LOSSARY BOOTP The B OOTP pr otocol al lo ws you to au tomati c all y map a n IP ad dr ess t o a giv en M AC addr ess each ti m e a device i s start ed. In addi tion, the protoco l can a ssign the sub net m ask a nd defau lt gat ewa y to a d evice .
G LOSSARY 165 Forwar ding Data bas e A data base t hat is stored by a s witch to det ermin e if a pac ket sh ould be forwar ded, an d which port s houl d forwar d the pac ket if it is to be for warded .
166 G LOSSARY IP Inter ne t P r otoc ol. IP is a laye r 3 n etwor k prot ocol that is the standa rd for sen ding data t hrough a n e twork. I P is pa rt of th e TCP /IP set of protoco ls that desc ribe t he rou ting of pac kets t o add r essed devi ces.
G LOSSARY 167 MAC addr ess Me dia Acce ss C ontrol address; also called h ardware or phy sical address. A laye r 2 a ddress asso ciated w ith a parti cular net wor k devi ce. Mo st devic es th at conn ect to a LAN ha ve a M A C address a ssigned to them as they ar e used to identi fy other devic es in a network .
168 G LOSSARY repeater A simp le device tha t r eg enerates LAN traf fic so that the t ransmission distan ce of tha t signal ca n be ext ended. Re peater s are used to con nect two LAN s of t he same n e twork t ype. resilient l ink A pair of p orts t hat can be co nfigur ed so that o ne takes o ver da ta tran smiss ion sho uld the oth er fail.
G LOSSARY 169 st andby port The por t in a re si lient l ink that t akes o ver data tr ansmissi o n if the main port i n the li nk fails. STP See Spann ing T ree Protocol ( STP) . sw itc h A device tha t interconne cts se vera l LANs to fo rm a single logic al LAN that comprises o f several LAN se gments.
170 G LOSSARY VL T V i rt ua l LA N T ru nk . A Sw itch -to - Sw it ch link tha t car ri es t raffi c fo r a ll th e VLANs on each Swit ch. WAN W ide Area Netwo rk. A communicat ions net w or k that cov ers a wide ar ea. A W AN c an cover a lar ge geograp hic ar ea, and may con tain severa l LANs within it .
I NDE X Numbers 1000BASE - SX por t 16 3Com b ullet in boar d serv ice (3 Com BBS) 158 3Com K nowledgeb ase Web S ervi ces 1 57 3Com UR L 157 3C om Fa ct s 159 A acc ess leve ls 4 0 a ccess p rofil es.
172 I NDEX E enabl in g a port 55 err ors, port 114 Event s, RM ON 121, 1 22 F fact or y defaul ts 23 fax se r vic e (3 C om F acts ) 159 FDB ad ding an en tr y 82 ag ing ent ries 81 blac khol e entr .
I NDEX 173 O on line te ch ni cal s e rvic es 1 57 P passwo r ds defaul t 4 1 fo rge ttin g 42 perm anent en tries, FDB 81 ping comman d 54 port co mmands ( table ) 56 enabl ing and di s abling 55 err.
174 I NDEX short cut s, co mmand 35 Simpl e Netw ork Manage m ent P rot ocol. See SNM P SNAP pr ot ocol 75 SNMP author ized m anager s 52 co mmunit y str ings 52 confi gurat i on com mand s (tab le) 5.
I NDEX 175 confi gurin g 76 defaul t 75 delet e an d res et com mands (t able) 79 descr ipti on 17 displ ay ing se tting s 78 mixi ng port- based an d t agged 72 name s 75 port- based 66 pro t ocol fi.
176 I NDEX.
I NDE X OF C OMMAND S C cl ea r cou n t er s 119 c lear fd b 85 , 104 cle ar igmp snoop ing 66 cl ea r ip ar p 50 cl ea r lo g 116 , 11 9 c lear se ssion 39 , 49 c onfig acces s-pro file 44 c onfig ac.
178 I NDEX OF C OMMANDS disa bl e log displ ay 118 disa bl e mirr orin g 61 disa bl e port s 55 , 57 disa bl e qosm onit or 108 disa bl e rmon 123 disa bl e shar in g 57 , 59 disa bl e snm p access 54.
I NDEX OF C OMMANDS 179 U unconf ig mana gement 54 unconf ig ports displ ay- stri ng 56 unconf ig stpd 97 unconf ig swi tch 40 , 133 unconf ig vlan ipaddres s 79 use c onf igura tion 133 , 13 5 use i .
180 I NDEX OF C OMMANDS.
3Com C orpor ati on L IMITED W ARRANTY This warra nty applies t o custo mers located i n the United Stat es, Australi a, Canad a (except Qu ebec), Ireland, New Zeala nd, U.K., and other English langu age countries , and countr ies for which a translat ion into th e local language is not provid ed.
3Com shall not be respons ible for any soft ware, fi rmware, i nformatio n, or me mory da ta of Cu stome r containe d in, sto red in, or i ntegra ted with an y produc ts retur ned to 3Com f or repa ir, whethe r under w arranty or not. Dead- or D efe ctive-on- Arriva l .
G OVERNI NG L AW This Limi ted W arranty sh all be gover ned by t he laws of the S tate of C alifor nia, U .S.A. e xcludi ng its c onflicts of laws pr inciples a nd exc luding the U nited Na tions Con ventio n on C ontract s for t he Interna tiona l Sale of Goods.
EMC S TATE MEN TS FCC S T ATEMENT T h is equipme nt has been te sted and f ound t o compl y with t he lim its for a C lass A digita l device, pur suant to part 15 o f the F CC rule s.
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 3Com 9100 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 3Com 9100 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso 3Com 9100 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul 3Com 9100 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il 3Com 9100, 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 3Com 9100.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il 3Com 9100. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo 3Com 9100 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.
