Multicast tutorial PDF - Garr

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Multicast Forwarding(‏RPF‏)‏ Reverse Path ForwardingWhat is RPF?A router forwards a multicast datagram only if received on the upstream interface to the source (i.e. it follows the distribution tree).The RPF CheckThe source IP address of incoming multicast packets are checkedagainst a unicast routing table.If the datagram arrived on the interface specified in therouting table for the source address; then the RPF checksucceeds.Otherwise, the RPF Check fails.16
Multicast Forwarding•Multicast uses unicast routes to determine path back tosource•RPF checks ensures packets won’t loop•RPF checks are performed against routing table bydefault•If multicast path is different from unicast path, then amulticast table will exist. It will be use for RPF check.•Routes contain incoming interfacePackets matching are forwardedPackets mis-matching are dropped17
Page 2 and 3: AgendaIntroductionMulticast address
Page 6: A bit of historyIn 1995 the first m
Page 9 and 10: The evolutionPIM Sparse mode(‏RP
Page 11 and 12: PIM Dense Mode OverviewPruning Unwa
Page 13 and 14: (S,G) notation• For every multica
Page 15: Multicast Forwarding•Multicast Ro
Page 19 and 20: Multicast Distribution TreesShortes
Page 21 and 22: Multicast Distribution Trees•Sour
Page 23 and 24: Multicast AddressingIP Multicast Gr
Page 25 and 26: Multicast AddressingGLOP addressesP
Page 27 and 28: •Introduction•Multicast address
Page 29 and 30: IGMPv2 Protocol Flow - Join a Group
Page 31 and 32: IGMPv2 Protocol Flow - Leave a Grou
Page 33 and 34: IGMP EnhancementsIGMP Version 2mult
Page 35 and 36: PIM-SMProtocol Independent Multicas
Page 37 and 38: PIM-SM Shared Tree JoinRP(*, G) Joi
Page 39 and 40: PIM-SM Sender RegistrationSourceRPT
Page 41 and 42: PIM-SM SPT SwitchoverSourceRPTraffi
Page 47 and 48: PIM-SSMNo shared treesNo register p
Page 49 and 50: PIM-SSMSourceRPData flows down the
Page 51 and 52: MSDPMulticast Source Discovery Prot
Page 53 and 54: MSDP Source Active MessagesInitial
Page 55 and 56: MSDP OverviewMSDP PeersDomain BRPDo
Page 57 and 58: MSDP Peers•MSDP establishes a nei
Page 59 and 60: MSDP with SSM - Unnecessary!ASM MSD
Page 61 and 62: MSDP Application: Anycast-RP•RFC
Page 63 and 64: Anycast-RPSrcRecRP1 - lo0X.X.X.X10.
Page 65 and 66: MBGP Overview•Multiprotocol Exten
Page 67 and 68:
MBGP Overview•New multiprotocol a
Page 69 and 70:
Summary•IGMP - Internet Group Man
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Multicast tutorial PDF - Garr

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