Zte ZXR10 2928E - Figure 4-40 Tangent Ring Design Figure

Chapter4ServiceConguration
Figure4-40TangentRingDesignFigure
AsshowninFigure4-40,theringcomposedbyS1,S2,S3andtheringcomposedby
S3,S4,S5aretangentatS3.Thetworingsbelongtodifferentareas,buttheyprotect
thesameprotectedvlans.
lZESRLinkhelloFunction
TheZESRprotocolofZXR102900EaddstheLinkhellointeractingprotocolbetween
adjacentnodes.Itisusedtodetectthelinkfaultssuchaslinkmonologueandlink
acrosstransmissionequipment.Linkhellointeractionisonlyusedforadjacentnodes
andhasnothingtodowithZESRnodetypeandnetworkform.
WhenLinkhellomechanismisadded,therearetwowaystodetectlinkstate:one
istodetectthephysicalstateoflink,anotheristosendLinkhelloframedetection
betweenthetwoadjacentnodesoftheloop.Onlywhenbothstateareup,thelinkis
up.Otherwisethelinkisdown.
4-99
SJ-20120409144109-002|2012-07-02(R1.0)ZTEProprietaryandCondential