Specifying the Logical RP Address for an SA Message
After receiving a Source Active (SA) message, an MSDP peer performs the Reverse Path Forwarding (RPF) check on the message. If the remote Rendezvous Point (RP) address carried in the SA message is the same as the local RP address, the MSDP peer discards the SA message. Therefore, you need to specify a logical RP address for SA messages on the device on which anycast RP is to be configured.
Context
After receiving an SA message, an MSDP peer performs the RPF check on the message. If the remote RP address carried in the SA message is the same as the local RP address, the SA message is discarded.
Perform the following steps on the FWs on which the anycast RP is to be configured:
Procedure
- Access the system view.
- Access the MSDP view.
msdp [ vpn-instance vpn-instance-name ]
- Specify a logical RP interface.
originating-rp interface-type interface-number
The logical RP interface cannot be the same as the actual RP interface. It is recommended that you configure the logical interface as the MSDP peer interface.
After the originating-rp command is used, the logical RP address carried in the SA message sent by the FW replaces the RP address in the IP header of the SA message, and the SA message can pass the RPF check after reaching the remote FW.
The system does not advertise routes on the Multicast Tunnel Interfaces (MTIs) to VPNs; therefore, the MTIs cannot be used as logical RPs.