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clear spantree spanguard

9-26 Spanning Tree Configuration

Mode

Switchcommand,read‐write.

Usage

SpanGuardisdesignedtodisable,orlockoutan“edge”portwhenanunexpectedBPDUis

received.Theportcanbeconfiguredtobere‐enabledafterasettimeperiod,oronlyaftermanual

intervention.

Aportcanbedefinedasanedge(user)portusingthesetspantreeadminedge

command,

describedin“setspantreeadminedge”onpage 9‐40.Aportdesignatedasanedgeportis

expectedtobeconnectedtoaworkstationorotherend‐usertypeofdevice,andnottoanother

switchinthenetwork.WhenSpanGuardisenabled,ifanon‐loopbackBPDUis

receivedonan

edgeport,theSpanningTreestateofthatportwillbechangedto“blocking”andwillnolonger

forwardtraffic.Theportwillremaindisableduntiltheamountoftimedefinedbysetspantree

spanguardtimeout(“setspantreespanguardtimeout”onpage 9‐27)haspassedsincethelastseen



BPDU,theportismanuallyunlocked(setorclearspantreespanguardlock,“clear/setspantree

spanguardlock”onpage 9‐29),theconfigurationoftheportischangedsoitisnotlongeranedge

port,ortheSpanGuardfunctionisdisabled.

SpanGuardisenabledanddisabledonlyonaglobal

basis(acrossthestack,ifapplicable).By

default,SpanGuardisdisabledandSpanGuardtrapsareenabled.

Example

ThisexampleshowshowtoenabletheSpanGuard function:

B5(rw)->set spantree spanguard enable

clear spantree spanguard

UsethiscommandtoresetthestatusoftheSpanningTreeSpanGuardfunctiontodisabled.

Syntax

clear spantree spanguard

Parameters

None.

Defaults

None.

Mode

Switchcommand,read‐write.

Example

ThisexampleshowshowtoresetthestatusoftheSpanGuardfunctiontodisabled:

B5(rw)->clear spantree spanguard

Enterasys b5 User Manual

Questions and Answers: