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Configuring IP Multicasting and Multimedia Services
1-4
117355-D Rev 00
Multicasting Extensions to OSPF
Multicast OSPF (MOSPF) extensions enhance the OSPF protocol by providing
capabilities that allow a router to forward multicast IP traffic within an OSPF
Version 2 autonomous system.
For instructions on customizing MOSPF, see Chapter 5, “Customizing OSPF
Multicast Extensions.”
Protocol Independent Multicast
Protocol Independent Multicast (PIM) is a multicast routing protocol that
efficiently routes multicast traffic between members of multicast groups that are
sparsely distributed across various regions of the Internet.
The Bay Networks implementation of PIM supports sparse mode. PIM has the
following characteristics:
Communicates with downstream members to join a shared tree by sending
explicit join messages.
Uses rendezvous points (RPs) for receivers to meet new sources. Sources
announce their existence to RPs; receivers query RPs to learn about multicast
sessions.
Establishes a shortest-path tree to create a data path between sources and
receivers.
For instructions on customizing PIM, see Chapter 6, “Customizing Protocol
Independent Multicast.”
Resource Reservation Protocol
The Resource Reservation Protocol (RSVP) allows host systems in an IP network
to reserve resources on RSVP-capable routers for unicast or multicast dataflows.
(A dataflow is a transmission of packets from a source to one or more destinations
requiring a certain QoS.)
For instructions on configuring RSVP, see Chapter 7, “Configuring RSVP.”
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