Zte ZXR10 2900E Series - Figure 5-37 Diagram of the Master Node Blocking Its Secondary Port When the Ring Is in up State

Chapter5ServiceConguration
NameDescription
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.
Figure5-37DiagramoftheMasterNodeBlockingitsSecondaryPortWhentheRing
isinUPState
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SJ-20130731155059-002|2013-11-27(R1.0)ZTEProprietaryandCondential