Operation Manual – MulticastH3C S5500-EI Series Ethernet Switches Chapter 8 MSDP Configuration8-33II. Analysisz The import-source command is used to control sending (S, G) entries through SAmessages to MSDP peers. If this command is executed without the acl-numberargument, all the (S, G) entries will be filtered off, namely no (S, G) entries of thelocal domain will be advertised.z If the import-source command is not executed, the system will advertise all the (S,G) entries of the local domain. If MSDP fails to send (S, G) entries through SAmessages, check whether the import-source command has been correctlyconfigured.III. Solution1) Check that a route is available between the routers. Carry out the display iprouting-table command to check whether the unicast route between the routers iscorrect.2) Check that a unicast route is available between the two routers that will becomeMSDP peers to each other.3) Check configuration of the import-source command and its acl-number argumentand make sure that ACL rule can filter appropriate (S, G) entries.8.8.3 Inter-RP Communication Faults in Anycast RP ApplicationI. SymptomRPs fail to exchange their locally registered (S, G) entries with one another in theAnycast RP application.II. Analysisz In the Anycast RP application, RPs in the same PIM-SM domain are configured tobe MSDP peers to achieve load balancing among the RPs.z An MSDP peer address must be different from the anycast RP address, and theC-BSR and C-RP must be configured on different devices or interfaces.z If the originating-rp command is executed, MSDP will replace the RP address inthe SA messages with the address of the interface specified in the command.z When an MSDP peer receives an SA message, it performs RPF check on themessage. If the MSDP peer finds that the remote RP address is the same as thelocal RP address, it will discard the SA message.III. Solution1) Check that a route is available between the routers. Carry out the display iprouting-table command to check whether the unicast route between the routers iscorrect.2) Check that a unicast route is available between the two routers that will becomeMSDP peer to each other.
