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clear spantree spanguard

8-26 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 8‐39.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 8‐27)haspassedsincethelastseen



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

spanguardlock”onpage 8‐29),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.Bydefault,SpanGuardisdisabledand

SpanGuardtrapsareenabled.

Example

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

D2(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:

D2(rw)->clear spantree spanguard

Enterasys D-Series User Manual

Questions and Answers: