User's Manual Part 2

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26JadeOSUserManual
Chapter5 Layer‐2 Network Service
JadeOSprovideslayer‐2networkservice.Thischapterwilldescribebridgeforwarding
andportmirror.
5.1BridgeForwarding
5.1.1BridgeDescription
BridgeisusedfortheinterconnectionamongtwoormoreLayer‐2networkanddata
frameforwardingbasedonMACaddressofLayer‐2network.
BridgesupportsMACaddresslearning.Bridgewillcreateonebridgetablebasedon
sourceMACaddresswhenonedataframefromoneMACaddressfirstgoingthrough
bridge.BridgetableisindexedbyMACaddress,anditwillrecordthephysicalinter‐
faceconnectedtothishost.Thereafter,whendataframefromthesameMACad‐
dresscometothishostagain,itwillbesenttothisphysicalinterfacesothattoavoid
sendingbroadcastmessagetoallinterfaces.
Bridgeforwardingisbasedonbridgetable,eachMACaddressiscorrespondingto
onetable.Bridgetablewillbeautomaticallydeletedifthereisnodataframefrom
thesameMACaddressgoingthroughthisbridgetableforawhile.Whenthereis
dataframecomingtothisbridgeafterawhile,bridgewilllearnMACaddressagain.
Besidesdynamiclearning,bridgetablesupportsstaticconfiguration,whichiscalled
statictable.
5.1.2ConfiguringBridge
BridgeconfigurationistoaddseveralphysicalinterfacestothesameVLAN.Inthe
sameVLAN,severalinterfacesformabridge,thecommunicationamongtheinter‐
facesisbridgeforwarding.
Pleaserefertochapter4.2andchapter4.3formoreinformation.
5.1.3DynamicTable
Dynamictableisgeneratedbysystemlearning.Systemwilllookupbridgetable
whenreceivingmessage.Ifnobridgetableisavailable,systemwillautomatically
generateabridgetablebasedonthesourceMACaddress,VLANID,andtheinter‐
faceofmessage.
Toinquirybridgetable,useshowdatapathbridgetablecommand.
Forexample:
(JadeOS) #show datapath bridge table