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Analysis
The import-source command controls 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 you do not configure the import-source command, the system advertises all the (S, G) entries of
the local domain. If MSDP fails to send (S, G) entries through SA messages, verify that the
import-source command has been correctly configured.
Solution
1.
Use the display ip routing-table command to verify that the unicast route between the routers is
correct.
2.
Verify that a unicast route is available between the two routers that will become MSDP peers to
each other.
3.
Verify the configuration of the import-source command and its acl-number argument and make
sure the ACL rule can filter appropriate (S, G) entries.
No SA entries exist in the router's SA cache
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 you configure the originating-rp command, MSDP replaces 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.
Use the display ip routing-table command to verify that 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.
Verify the configuration of the originating-rp command. In the Anycast RP application environment,
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.
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Troubleshooting
