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Chapter11EthernetOAMConguration
FIGURE26MAINTENANCEDOMAINFIGURE
AsshowninFigure27,anetworkcanbedividedintouserdomain,
providerdomainandoperatordomain.Eachestablisheddomain
willbedesignatedalevel,thereare0-7levelsintotal.Thedo-
mainlevelwilldecidedomaininclusionrelationship.Thedomain
withlargelevelcanincludethedomainwithlowlevel,whereas
itdoesn’twork.Thedomainswithsamelevelcan’tincludeeach
other .Thatis,thedomainwiththelargestrangehasthehighest
level.Domaininclusionrelationshipcannotbeintersectionbut
tangency(internally-tangentorexternally-tangent)andinclusion.
ConnectivityFaultManagement(CFM)isusefultoVirtualBridged
LocalAreaNetworksfordetecting,isolating,andreportingconnec-
tivityfaults.ItisaimedprimarilyatProviderBridgedNetworks,
butisusefulalsoforC-VLANnetworks.IEEE802.1agstandard
denesthefollowingmechanism:
1.ConguremultipleembeddedMDsbyabridgenetwork.Each
domaincanbemanagedbydifferentmanagementorganiza-
tion.
2.CongureMAMaintenanceAssociation)identiedbyaloneMD
inanydesignatedbridgeandagroupofVLANs.
3.Protocol,workowandCFMprotocolpacketformatfordetect-
ing,isolating,andreportingconnectivityfaults.
4.CongureandmanagecongurationabilityofMP(mainte-
nancepoint)inMA.MPisusedforgeneratingCFMpacket.
5.DemandMPstoimplementspecicfaultisolatingoperationand
inspectresult.
CondentialandProprietaryInformationofZTECORPORATION95