3com S7906E Installation Instruction

 

1-6 

Because the SA message is from a static RPF peer (RP 6), RP 7 accepts the SA message and forwards 

it to other peer (RP 8).  

6)  When RP 8 receives the SA message from RP 7  

A BGP or MBGP route exists between two MSDP peers in different ASs. Because the SA message is 

from an MSDP peer (RP 7) in a different AS, and the MSDP peer is the next hop on the BGP or MBGP 

route to the source-side RP, RP 8 accepts the message and forwards it to its other peer (RP 9).  

7)  When RP 9 receives the SA message from RP 8  

Because RP 9 has only one MSDP peer, RP 9 accepts the SA message.  

SA messages from other paths than described above will not be accepted nor forwarded by MSDP 

peers.  

Anycast RP refers to such an application that enables load balancing and redundancy backup between 

two or more RPs within a PIM-SM domain by configuring the same IP address for, and establishing 

MSDP peering relationships between, these RPs.  

As shown in 

, within a PIM-SM domain, a multicast source sends multicast data to multicast 

group G, and Receiver is a member of the multicast group. To implement Anycast RP, configure the 

same IP address (known as anycast RP address, typically a private address) on Router A and Router B, 

configure these interfaces as C-RPs, and establish an MSDP peering relationship between Router A 

and Router B.  

 

Usually an Anycast RP address is configured on a logic interface, like a loopback interface. 

 

Figure 1-4 Typical network diagram of Anycast RP 

SA message

Router A

Router B

PIM-SM

MSDP peers

 

 

The work process of Anycast RP is as follows: