H3C Technologies H3C SecPath F1000-E - Manual (Page 94)

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Analysis
• The import-source command is used to control sending (S, G) entries through SA messages to
MSDP peers. If this command is executed without the acl-number argument, all the (S, G) entries will
be filtered off, namely no (S, G) entries of the local domain will be advertised.
• 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 SA messages, check whether the
import-source command has been correctly configured.
Solution
Step1 Check that a route is available between the routers. Carry out the display ip routing-table
command to check whether the unicast route between the routers is correct.
Step2 Check that a unicast route is available between the two routers that will become MSDP peers to each
other.
Step3 Check configuration of the import-source command and its acl-number argument and make sure that
ACL rule can filter appropriate (S, G) entries.
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
Step1 Check that a route is available between the routers. Carry out the display ip routing-table
command to check whether the unicast route between the routers is correct.
Step2 Check that a unicast route is available between the two routers that will become MSDP peer to each
other.
Step3 Check 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.
Step4 Verify that the C-BSR address is different from the anycast RP address.