Avaya Configuring IP Multicasting and Multimedia Services Manual de usuario descargar pdf (Pagina 190)

Configuring IP Multicasting and Multimedia Services

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The DR can be a first-hop router, a last-hop router, or both, depending on how you

configure your network and which applications you use.

When multiple PIM routers are connected to a multiaccess LAN, PIM elects the

router with the highest priority as the DR for the LAN. If two routers have equal

priority, then PIM elects the router with the higher IP address as the DR for the

LAN.

Rendezvous Point (RP) Routers

Within each domain, PIM builds a shared tree to support a multicast group. At the

root of this shared tree is the rendezvous point (RP), where receivers meet new

sources. When a source wants to announce itself and send data to group members

on the shared tree, it sends a register message to the RP. When a receiver wants to

receive data for a group, it sends a join message to the RP.

Depending on how you configure your PIM network, an RP can be any PIM router

that is physically close to one of the members of the group. An RP can also be

another PIM router in the network.

An RP is responsible for specific group prefixes. For example, if you have a

network with three RPs, then the group prefixes might be as follows:

• RP1 is responsible for groups 224.0.0.0 through 227.255.255.255.

• RP2 is responsible for groups 228.0.0.0 through 239.255.255.255.

• RP3 is responsible for groups 224.0.0.0 through 239.255.255.255.

You can configure multiple candidate RPs (C-RPs), but only one RP can be active

for each multicast group.

For information about configuring a router as an RP, see “Starting PIM” on page

2-7.

Candidate RP Routers

You can configure a set of routers in a PIM domain as candidate RPs (C-RPs).

C-RPs periodically send unicast advertisement messages to the bootstrap router

(BSR) for that domain. These messages contain the configured Class D group

address ranges that the C-RP is responsible for.

You can configure a PIM router to serve as both a C-RP and a C-BSR for one PIM

domain. This is the PIM implementation most commonly used.

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Avaya Configuring IP Multicasting and Multimedia Services Manual de usuario Pagina 190