5-11Task RemarksConfiguring the Transmission and Filtering of SA Request Messages OptionalConfiguring a Rule for Filtering the Multicast Sources of SA Messages OptionalConfiguring a Rule for Filtering Received and Forwarded SA Messages OptionalConfiguring RP Address in SA MessagesMSDP peers deliver SA messages to one another. Upon receiving an SA message, a router performsan RPF check on the message. If the router finds that the remote RP address is the same as the localRP address, it will discard the SA message. In anycast RP application, however, you need to configureRPs with the same IP address on two or more routers in the same PIM-SM domain, and configure theseRPs as MSDP peers to one another. Therefore, a logic RP address (namely the RP address on a logicinterface) that is different from the actual RP address must be designated for SA messages so that themessages can pass the RPF check.Follow these steps to configure RP address in SA messages:To do... Use the command... RemarksEnter system view system-view —Enter MSDP view msdp —Configure the address of thespecified interface as the RPaddress in SA messagesoriginating-rp interface-typeinterface-numberRequiredBy default, the RP address inSA messages is the RPaddress configured for PIM.In Anycast RP application, a C-BSR and a C-RP must be configured on different devices or ports.Configuring SA Message CacheWith the SA message caching mechanism enabled on the router, the group that a new membersubsequently joins can obtain all active sources directly from the SA cache and join the correspondingSPT source tree, instead of waiting for the next SA message.You can configure the number of SA entries cached in each MSDP peer on the router by executing thefollowing command, but the number must be within the system limit. To protect a router against Denialof Service (DoS) attacks, you can manually configure the maximum number of SA messages cached onthe router. Generally, the configured number of SA messages cached should be less than the systemlimit.Follow these steps to configure SA message cache:To do... Use the command... RemarksEnter system view system-view —
