H3C Technologies H3C S10500 Series Switches - Manual (Page 250)

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Inter-RP communication faults in Anycast RP application
Symptom
RPs fail to exchange their locally registered (S, G) entries with one another in the Anycast RP application.
Analysis
• In the Anycast RP application, RPs in the same PIM-SM domain are configured to be MSDP peers to
achieve load balancing among the RPs.
• An MSDP peer address must be different from the Anycast RP address, and the C-BSR and C-RP must
be configured on different devices or interfaces.
• If the originating-rp command is executed, MSDP will replace the RP address in the SA messages
with the address of the interface specified in the command.
• When an MSDP peer receives an SA message, it performs RPF check on the message. If the MSDP
peer finds that the remote RP address is the same as the local RP address, it will discard the SA
message.
Solution
1. Verify that a route is available between the routers. Use the display ip routing-table command to
determine whether the unicast route between the routers is correct.
2. Verify that a unicast route is available between the two routers that will become MSDP peer to
each other.
3. Evaluate the configuration of the originating-rp command. In the Anycast RP application
environment, be sure to use the originating-rp command to configure the RP address in the SA
messages, which must be the local interface address.
4. Verify that the C-BSR address is different from the Anycast RP address.