Zte ZXR10 ZSR V2 - Chapter 14 IPv6 PIM-SM Configuration

Chapter14
IPv6PIM-SMConguration
TableofContents
PIM-SMOverview....................................................................................................14-1
ConguringIPv6PIM-SM.........................................................................................14-3
IPv6PIM-SMCongurationExample........................................................................
14-7
14.1PIM-SMOverview
PIM-SMIntroduction
PIM-SMismainlyusedinthefollowingsituations:
lGroupmemberssparselylocateinarelativelylargescale.
lThenetworkbandwidthresourcesarelimited.
PIM-SMdoesnotdependonaspecicunicastroutingprotocol.PIM-SMassumesthat
allroutersonasharedsegmentdonotneedtosendmulticastpackets.Theroutersonly
canreceiveandsendmulticastpacketsaftertheyrequesttojoinamulticastgroupon
theirowninitiative.PIM-SMadvertisesthemulticastinformationtoallrouterssupporting
PIM-SMthroughanRP .InPIM-SM,arouterjoinsorleavesthemulticastgroupexplicitly.
Thisreducesthenumberofpacketsandthebandwidthusedbythecontrolpackets.
RP
PIM-SMsendsmulticastpacketsbyusingasharedtree.Asharedtreehasacenterpoint
thatisresponsibleforsendingpacketstoallthesource-sendingendsinthemulticast
group.Eachsource-sendingendsendspacketstothecenterpointalongtheshortest
path,andthentakesthecenterpointastherootpointtodistributethepacketstovarious
receivingendsofthegroup.
ThegroupcenterpointofthePIM-SMiscalledtheRP .TheremaybeseveralRPsina
network,butthereisonlyoneRPinamulticastgroup.
AroutercanobtainthelocationoftheRPintwoways.
1.ConguretheRPmanuallyandstaticallyontheroutersrunningPIM-SM.
2.PIM-SMv2obtainsthelocationthroughthecandidateRPadvertisement.The
candidateRPwiththehighestprioritybecomesaformalRP .
InPIM-SM,someroutersrunningPIM-SMaremanuallysettoworkascandidateBootstrap
Router(BSR).ThecandidateBSRwiththehighestpriorityiselectedastheformalBSR.
TheBSRisresponsibleforcollectingthecandidateRPinformationonthemulticastrouters
ingrouptondoutcandidateRPsinthemulticastdomain.ItnotiesthecandidateRPsto
14-1
SJ-20140504150128-018|2014-05-10(R1.0)ZTEProprietaryandCondential