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Functions in dense mode Add RP(s) later. Functions in sparse mode Use “Auto RP” to minimize RP configuration task 303 1011_05F9_c3 94 © 1999, Cisco Systems, Inc. Cisco Systems Confidential 47 IP Multicast Protocol Checklist Dense Sparse Distribution Distribution DVMRP X X MOSPF X PIM-DM CBT PIM-SM 303 1011_05F9_c3 X Extensible to IDMR X ProtocolStandards Industry Efficient Independent Status Usage X X X X X X X X X X X X X X X X X X X 95 © 1999, Cisco Systems, Inc. Summary • Multicast Applications are a reality • Multicast is an End-to-End Technology • PIM-SM is the only scaleable answer today for a Multicast Interior Gateway Protocol 303 1011_05F9_c3 96 © 1999, Cisco Systems, Inc.
Cisco Systems Confidential 34 Evaluation Evaluation:: DVMRP • Most effective for dense distribution of multicast receivers • Widely used on the MBONE (being phased out) • Significant scaling problems Slow Convergence—RIP-like behavior Significant amount of multicast routing state information stored in routers—(S,G) everywhere No support for shared trees Maximum number of hops < 32 • Not appropriate for large scale networks with… Few interested receivers due to flood and prune behavior Groups sparsely represented over WAN 303 1011_05F9_c3 69 © 1999, Cisco Systems, Inc.
Sparse-Mode Protocols • PIM SM Protocol Independent Multicast Sparse-Mode • Other CBT, OCBT, QOSMIC, etc. 303 1011_05F9_c3 74 © 1999, Cisco Systems, Inc. Cisco Systems Confidential 37 Sparse-Mode Protocols • Works for either sparse or dense groups, optimized for sparsely populated groups Explicit join behavior—assumes no one wants the packet unless they asked Uses either source or shared distribution trees Joins propagate from receiver to RP or sources. Sources are learned by first having their packets flow down the shared-tree 303 1011_05F9_c3 75 © 1999, Cisco Systems, Inc.