Operation Manual – MulticastH3C S5600 Series Ethernet Switches Chapter 5 MSDP Configuration5-7An EBGP route exists between two MSDP peers in different ASs. Because the SAmessage is from an MSDP peer (RP 7) in a different AS, and the MSDP peer is the nexthop on the EBGP route to the source-side RP, RP 8 accepts the message and forwardsit to its other peer (RP 9).7) When RP 9 receives the SA message from RP 8Because 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 norforwarded by MSDP peers.IV. Implementing intra-domain Anycast RP by leveraging MSDP peersAnycast RP refers to such an application that enables load balancing and redundancybackup between two or more RPs within a PIM-SM domain by configuring the same IPaddress for, and establishing MSDP peering relationships between, these RPs.As shown in Figure 5-4, within a PIM-SM domain, a multicast source sends multicastdata to multicast group G, and Receiver is a member of the multicast group. Toimplement 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 asC-RPs, and establish an MSDP peering relationship between Router A and Router B.Note:Usually an Anycast RP address is configured on a logic interface, like a loopbackinterface.SA messageSource ReceiverRouter A Router BRP 1 RP 2PIM-SMMSDP peersFigure 5-4 Typical network diagram of Anycast RPThe work process of Anycast RP is as follows:
