clear spantree spanguard
8-26 Spanning Tree Configuration
Mode
Switchcommand,readwrite.
Usage
SpanGuardisdesignedtodisable,orlockoutan“edge”portwhenanunexpectedBPDUis
received.Theportcanbeconfiguredtobereenabledafterasettimeperiod,oronlyaftermanual
intervention.
Aportcanbedefinedasanedge(user)portusingthesetspantreeadminedgecommand,
describedinsetspantreeadminedgeonpage839.Aportdesignatedasanedgeportis
expectedtobeconnectedtoaworkstationorotherendusertypeofdevice,andnottoanother
switchinthenetwork.WhenSpanguardisenabled,ifanonloopbackBPDUisreceivedonan
edgeport,theSpanningTreestateofthatportwillbechangedto“blocking”andwillnolonger
forwardtraffic.Theportwillremaindisableduntiltheamountoftimedefinedbysetspantree
spanguardtimeout(“setspantreespanguardtimeoutonpage827)haspassedsincethelastseen
BPDU,theportismanuallyunlocked(setorclearspantreespanguardlock,clear/setspantree
spanguardlockonpage 829),theconfigurationoftheportischangedsoitisnotlongeranedge
port,ortheSpanGuardfunctionisdisabled.
SpanGuardisenabledanddisabledonlyonaglobalbasis.Bydefault,SpanGuardisdisabledand
SpanGuardtrapsareenabled.
Example
ThisexampleshowshowtoenabletheSpanGuardfunction:
D2(rw)->set spantree spanguard enable
clear spantree spanguard
UsethiscommandtoresetthestatusoftheSpanningTreeSpanGuardfunctiontodisa bled.
Syntax
clear spantree spanguard
Parameters
None.
Defaults
None.
Mode
Switchcommand,readwrite.
Example
ThisexampleshowshowtoresetthestatusoftheSpanGuardfunctiontodisabled:
D2(rw)->clear spantree spanguard