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Troubleshooting MSDP
This section describes details about troubleshooting MSDP.
MSDP peers stay in down state
Symptom
The configured MSDP peers stay in down state.
Analysis
•
A TCP connection–based MSDP peering relationship is established between the local interface
address and the MSDP peer after the configuration.
•
The TCP connection setup will fail if the local interface address is not consistent with the MSDP
peer address configured on the peer router.
•
If no route is available between the MSDP peers, the TCP connection setup will fail.
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.
Use the
display current-configuration
command to verify that the local interface address and
the MSDP peer address of the remote router are the same.
No SA entries exist in the router's SA cache
Symptom
MSDP fails to send (S, G) entries through SA messages.
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 (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 (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 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.
