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Multicast at Interconnects

Multicast at Interconnects. John Meylor <jmeylor@cisco.com> NANOG November 8-10, 1998. Objectives:. support for native multicast routing use of scalable, policy-based routing in inter-domain space allow for variety of protocols and topologies in intra-domain space. Design elements:.

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Multicast at Interconnects

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  1. Multicast at Interconnects John Meylor <jmeylor@cisco.com> NANOG November 8-10, 1998

  2. Objectives: • support for native multicast routing • use of scalable, policy-based routing in inter-domain space • allow for variety of protocols and topologies in intra-domain space

  3. Design elements: • route exchange • BGP or BGP4+ to provide scalable, policy based EGP • tree building/multicast forwarding protocol • PIM to allow for (M)BGP interdomain and IGP intradomain • PIM DM initially (to flood s,g state to collocated RPs) • PIM SM eventually (to reduce flood-prune, requires MSDP)

  4. Design elements: • method for identifying active sources • dense mode flooding of data to establish s,g state • MSDP to flood only SA packets to MSDP peers • media • native broadcast, single packet per source • fddi concentrator commonly used • simple, reasonably common denominator • eliminates variable of switching mechinisms initially

  5. Topology example: Ames MIX AS10888---R----"MBone" | | multicast_interexchange (MIX) ---------------- / \ / \ mbgp_peer---R R---mbgp_peer \ / \ / --------------- FIX unicast_exchanges

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