STP Lab 31 32Word文档下载推荐.docx

STP Lab 31 32Word文档下载推荐.docx

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ConnecttoDLS1andenterthefollowingcommands:

Switch>

enable

Switch#configureterminal

Switch（config）#hostnameDLS1

DLS1（config）#enablesecretclass

DLS1（config）#lineconsole0

DLS1（config-line）#passwordcisco

DLS1（config-line）#login

ConnecttoDLS2andenterthefollowingcommands:

2-6CCNP:

BuildingMultilayerSwitchedNetworksv5.0-Lab3-1Copyright©

2006,CiscoSystems,Inc

Switch（config）#hostnameDLS2

DLS2（config）#enablesecretclass

DLS2（config）#lineconsole0

DLS2（config-line）#passwordcisco

DLS2（config-line）#login

ConnecttoALS1andenterthefollowingcommands:

Switch（config）#hostnameALS1

ALS1（config）#enablesecretclass

ALS1（config）#lineconsole0

ALS1（config-line）#passwordcisco

ALS1（config-line）#login

ConnecttoALS2andenterthefollowingcommands:

Switch#configureterminal

Switch（config）#hostnameALS2

ALS2（config）#enablesecretclass

ALS2（config）#lineconsole0

ALS2（config-line）#passwordcisco

ALS2（config-line）#login

Step2

Afterthecablesareconnectedandtheswitchdetectstheredundantlinks,

spanningtreeisinitiated.

Bydefault,spanningtreerunsoneveryport.Whenanewlinkbecomesactive,

theportgoesthroughthelistening,learning,andforwardingstatesbeforeit

becomesactive.Duringthisperiod,theswitchdiscoversifitisconnectedto

anotherswitchoranend-userdevice.

Ifanotherswitchisdetected,thetwoswitchesbegincreatingaspanningtree.

Oneoftheswitchesiselectedastherootofthetree.Thenanagreementis

establishedastowhichlinkstokeepactiveandwhichlinkstodisableifmultiple

linksexist.

1.WhattypeofframedoesSTPusetocommunicatewithotherswitches?

NoteTheresultsinthislabwillvary.Spanningtreeoperationisbased

ontheMACaddressoftheswitches.

ObservetheLEDsontheswitchtocheckthestatusofthelink.Abrightgreen

lightindicatesanactivelink.Anamberlightindicatesaninactivelink.

3-6CCNP:

Step3

VerifySTPwiththeshowspanning-treecommandonDLS1:

DLS1#showspanning-tree

VLAN0001

Spanningtreeenabledprotocolieee

RootIDPriority32769

Address000a.b8a9.d680

Cost19

Port13（FastEthernet0/11）

HelloTime2secMaxAge20secForwardDelay15sec

BridgeIDPriority32769（priority32768sys-id-ext1）

Address000a.b8a9.d780

AgingTime300

InterfaceRoleStsCostPrio.NbrType

--------------------------------------------------------------------

--

Fa0/7DesgFWD19128.9P2p

Fa0/8DesgFWD19128.10P2p

Fa0/9DesgFWD19128.11P2p

Fa0/10DesgFWD19128.12P2p

Fa0/11RootFWD19128.13P2p

Fa0/12AltnBLK19128.14P2p

VerifySTPwiththeshowspanning-treecommandonDLS2:

DLS2#showspanning-tree

Thisbridgeistheroot

Fa0/11DesgFWD19128.13P2p

Fa0/12DesgFWD19128.14P2p

VerifySTPwiththeshowspanning-treecommandonALS1:

ALS1#showspanning-tree

4-6CCNP:

Port11（FastEthernet0/9）

Address0019.0635.5780

InterfaceRoleStsCost

1d22h:

%SYS-5-CONFIG_I:

ConfiguredfromconsolebyconsolePrio.Nbr

Type

Fa0/7AltnBLK19128.9P2p

Fa0/8AltnBLK19128.10P2p

Fa0/9RootFWD19128.11P2p

Fa0/10AltnBLK19128.12P2p

VerifySTPwiththeshowspanning-treecommandonALS2:

ALS2#showspanning-tree

Port9（FastEthernet0/7）

Address0019.068d.6980

Fa0/7RootFWD19128.9P2p

Fa0/9AltnBLK19128.11P2p

Fa0/11AltnBLK19128.13P2p

Noticethatbetweentwoswitches,oneofthetwoportsissettoblocking.

Blockingcouldoccurontheaccesslayerswitchorthedistributionlayerswitch.If

allportshavetheirdefaultsetting,thehigherinterfacenumberofthetwoportsis

settoblocking.

Theswitchportisinblockingstatebecauseitdetectedtwolinksbetweenthe

sameswitches.Thiswouldresultinabridgeloopiftheswitchlogicallydisables

onelink.

5-6CCNP:

NoteYouroutputmaydiffer,becauseallswitcheshavethedefault

bridgepriorityof32769andselectionoftherootbridgeisbased

uponthelowestswitchMACaddress.Thesampleoutputbelow

mayalsodifferfromthoseinyourlab,becausetheywere

generatedwithadifferentsetofswitches.

Afterreviewingthespanningtreeoutput,answerthefollowingquestions.

1.Whichswitchistherootofthespanningtree?

2.Howcantherootswitchbeidentified?

3.Whywasthatswitchselectedastheroot?

6-6CCNP:

4.Whatcausedoneporttobeinblockingstateoveranother?

5.Whatcausedonelinktobeblockedoveranother?

Step4

CreateadiagramofthespanningtreetopologyforVLAN01.WithCiscoCatalyst

switches,thereisadifferentspanningtreestateforeachVLAN.Identifytheroot

bridge,rootports,anddesignatedports.

Inthislab,thedefaultoperationofspanningtreewasobserved.Sincenobridge

prioritieswerespecified,theswitchwiththelowestMACaddresswaselectedas

theroot.Sincenolinkprioritieswerechanged,thelinkwiththelowestcostwas

chosenastheactivelink.Ifcostswereequal,thetiewasbrokenbythelowest

portnumber.

Inalaterlab,thedefaultSTPbehaviorwillbemodifiedsothatspanningtree

worksaccordingtospecifications.

Challenge

Trytoguesshowyourtopologywouldlookifyoucompletelyremovedtheroot

switch.RememberthattheswitchwiththelowestMACaddressbecomesthe

root.

Now,shutdownalltheportsonyourcurrentrootswitch.Usetheshow

spanning-treecommandontheotherswitches.Didthetopologyconvergethe

wayyouthoughtitwould?

1-12CCNP:

BuildingMultilayerSwitchedNetworksv5.0-Lab3-2Copyright©

Lab3-2ModifyingDefaultSpanningTreeBehavior

Thepurposeofthislabistoobservewhathappenswhenthedefaultspanning

treebehaviorismodified.

links.Inthislab,youwillseewhathappenswhenthedefaultspanningtree

behaviorismodified.

Startbydeletingvlan.dat,erasingthestartupconfiguration,andreloadingyour

switches.Afterreloadingtheswitches,givethemhostnames.Youcanfind

detailedinstructionsinLab2.0.

Us