ZXR102900ESeriesConīægurationGuide
--------------------------------------------------------------------------------
port-1900d0d0092918110BSZXR102918E-PSport-9Unknown
VersionV2.05..
zte(cfg)#showlldpentry
--------------------------------------------------------
LocalPort:port-19
ChassisID:00d0d0092918(MACAddress)
PortID:port-9(InterfaceName)
TTLID:100(Timetolive)
PortDescription:port-9statusisup,media-typeis100BaseT,pvidis1.
SystemName:zte
SystemDescription:ZXR102918E-PSVersionV2.05.10.B10
SystemCapability:BridgeSwitch
4.36SinglePortLoopDetectionConīguration
SinglePortLoopDetectionOverview
Singleportloopdetectionistocheckwhetheraloopexistsintheportsoftheswitch.Ifsuch
aloopexists,itmayresultinerrorsinlearningMACaddressesandmayeasilycausea
broadcaststorm.Inseverecase,switchandnetworkmaybedown.Startingthesingleport
loopdetectionanddisablingtheportwithloopcanefīæcientlyavoidtheinīuencecaused
byportloop.
Theswitchsendsatestpacketthroughaport.Ifthistestpacketisreceivedthroughthe
portwithoutanychange(oronlyatagisattached),itindicatesthataloopexistsinthis
port.
Thetestpacketsentbytheswitchincludesthefollowingthreeparameters:
lSourceMACaddress:ItindicatestheMACaddressoftheswitch.TheMACaddress
ofeachswitchisunique.
lPortNumber:Portnumberscorrespondtothenumbersoftheportsontheswitchone
byone.
lDiscriminationField:Foreachswitch,thedigitalsignatureofeachportisdifferent.
Whenthreeparametersinthereceivingandsendingtestpacketsaresame,theloop
deīænitelyexistsonthisport.
ConīguringSinglePortLoopDetection
Theconīægurationofsingleportloopdetectionincludesthefollowingcontents:
CommandFunction
zte(cfg)#setloopdetectsendpktinterval<5-60>
Setstheintervalforsendingloop
detectionpacket.
4-128
SJ-20120409144109-002|2012-07-02(R1.0)ZTEProprietaryandConīædential