Avaya Configuring IP Multicasting and Multimedia Services Manual de usuario descargar pdf (Pagina 196)

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Configuring IP Multicasting and Multimedia Services

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How a Receiver Joins a Multicast Group

The following steps, which are illustrated in Figure 6-3, describe how a receiver

joins a multicast group:

A receiver sends an IGMP host membership message to the DR (normally the

last-hop router for that group) on its local interface. The IGMP message

contains the address of the multicast group that the receiver wants to join.

When the DR receives the IGMP message, it examines the group address and

checks the associated group’s RP list to determine the RP for the group.

After determining the RP for the group, the DR creates a route entry in the

multicast forwarding table for the group pair (*, group) and sends a unicast

PIM join message directly to the RP. The (*, group) notation indicates any

source-group pair.

All intermediate routers along the path to the RP create the same entry

(*, group) in their multicast forwarding tables. This entry enables the

intermediate routers to forward future multicast traffic addressed to the

(*, group) pair downstream toward the DR that originated the PIM join

message.

The RP receives the PIM join message and updates its cache. If the RP knows

the requested group, it forwards the multicast packets downstream toward the

last-hop router.

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