Zte ZXR10 5250-52TC - Page 156

ZXR105250SeriesCongurationGuide
NameDescription
ZESRNodeRoleAZESRnodecanactasamasternode,atransitnode,anedgecontrolnode,
oranedgeassistantnode.
lAmasternodeimplementsthecontrolfunctionandtransmitsdatainaring.
lAtransitnodetransmitsdatainaring.
lAnedgecontrolnodeimplementsthecontrolfunctionandtransmitsdata
inasecondaryring.
lAnedgeassistantnodetransmitsdatainasecondaryring.
PrimaryPortand
SecondaryPort
Whenadeviceisconguredasamasternodeoratransitnode,twoportsneed
tobedesignatedforit,thatis,aprimaryportandasecondaryport.Theprimary
portandsecondaryportofatransitnodehavethesamefunctions,whilethe
primaryportandsecondaryportofamasternodehavethefollowingdifferences:
lWhenaringisinUPstate,theprimaryportofamasternodeisin
Forwardingstate,andthesecondaryportisinBlockingstatetoblock
logicalloops.
lWhenaringisinDOWNstate,ZESRrapidlytransitsthesecondaryport
ofamasternodefromBlockingstatetoForwardingstatetoswitchthe
logicalpathquickly.
BoundaryPortWhenadeviceisconguredasanedgecontrolnodeoranedgeassistant
node,oneportneedstobedesignatedforit,thatis,aboundaryport.
ZESRLinkSwitchingIntroduction
ZESReliminateslogicalloopsbyblockingsomeparticularportsinaring;andwhenthe
statesofsomelinksinaringchange(fromontooff,orfromofftoon),ZESRcanrapidly
switchthelogicalpaths.
Figure5-37showsthediagramofthemasternodeblockingitssecondaryportwhenthe
ringisinUPstate.Figure5-38showsthediagramofthemasternodeopeningitssecondary
portwhentheringisinDOWNstate.Inbothdiagrams,switchesA,B,CandDare
conguredwithaZESRdomain,inwhichswitchAisthemasternodewithport1/1as
itsprimaryportandport1/2asitssecondaryport,andswitchesB,CandDarethetransit
nodes.
PC1interchangesservicedatatrafcwithPC2.Thearrowsinthediagramsindicatethe
owoftheservicedata.
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SJ-20131111172707-002|2013-11-27(R1.0)ZTEProprietaryandCondential