文档介绍：SoftwireMeshMulticastdraft-xu-softwire-mesh-multicast-01MingweiXu,YongCui,ShuYangTsinghuaUniversityChrisMetz,GregShephardCiscoIETF80Meeting,?MVPN-likeschemescanachieve“many-to-one”mapping“One-to-one”mapping(-stylemulticast)isneededUpdatefromlastIETFdraft-xu-softwire-mesh-multicast-00PossiblesolutionsdiscussionforIPv6-over-IPv4LimitIPv6addressspaceApproximate“one-to-one”Inter-AFBRsignalingdraft-xu-softwire-mesh-multicast-01GivetwosolutionsforIPv6-over-IPv4LimitIPv6addressspaceInter-AFBRsignalingMeshmulticastframeworkI-IPTransitCoreE-IPAFBRAFBRAFBRE-IPE-IPAFBRE-IPSRRI-IPTreeE-IPTreeIPv4-over-IPv6(S,G)(p::S,p::G)(S,G)ordancewiththeIPv6multicastaddressformatof[RFC2373]Thenext10octetsareassignedbyISPFFXYISPassignedIPv4address01696127ActionsperformedbyAFBRReceivingaPIMmessage:DownstreamAFBRIfnext-hopisIPv6:PerformPIMmessageconversionElse:JustforwardingUpstreamAFBRIftheprefixisISPassigned:TranslateitbackElse:JustforwardingIPv6-over-IPv4-DifficultyBecauseoflargerspaceofIPv6addressI-IPIPv4multicastaddresslimitations:NotallIPv4multicastaddressesareavailableHardtomapwithoutcollisionSolution1:LimitIPv6addressspacePickupaportionofIPv6addressesHigherorderbitsshouldbefixed“IPv4-EmbeddedIPv6MulticastAddressFormat”(draft-boucadair-behave-64-multicast-address-format-01)helowerbitsaretreatedasFlow_ID(S,G)(S’,G’)?(S,G)GG’S’UpstreamAFBRisgivenasignalfortranslatingSolution2:Inter-AFBRsignaling