H3C S5600 SERIES Operation Manual page 443

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An RP is dynamically elected from C-RPs. To enhance network robustness, a PIM-SM network typically

has more than one C-RP. As the RP election result is unpredictable, MSDP peering relationships

should be built among all C-RPs so that the winner C-RP is always on the "MSDP interconnection map",

while loser C-RPs will assume the role of common PIM-SM routers on the "MSDP interconnection

Implementing inter-domain multicast delivery by leveraging MSDP peers

5-2, an active source (Source) exists in the domain PIM-SM 1, and RP 1 has

learned the existence of Source through multicast source registration. If RPs in PIM-SM 2 and PIM-SM

3 also wish to know the specific location of Source so that receiver hosts can receive multicast traffic

originated from it, MSDP peering relationships should be established between RP 1 and RP 3 and

between RP 3 and RP 2 respectively.

Figure 5-2 MSDP peering relationships

Multicast packets

Join message

The process if implementing inter-domain multicast delivery by leveraging MSDP peers is as follows:

When the multicast source in PIM-SM 1 sends the first multicast packet to multicast group G, DR 1

encapsulates the multicast data within a register message and sends the register message to RP 1.

Then, RP 1 gets aware of the information related to the multicast source.

As the source-side RP, RP 1 creates SA messages and periodically sends the SA messages to its

MSDP peer. An SA message contains the source address (S), the multicast group address (G),

and the address of the RP which has created this SA message (namely RP 1).

On MSDP peers, each SA message is subject to a Reverse Path Forwarding (RPF) check and

multicast policy–based filtering, so that only SA messages that have arrived along the correct path

and passed the filtering are received and forwarded. This avoids delivery loops of SA messages. In

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