H3C Technologies H3C S12500 Series Switches - Manual (Page 232)

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Solution
1. Use the display ip routing-table command to verify that the unicast route between the devices is
correct.
2. Check that a unicast route is available between the two devices 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 device'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 the (S, G) entries will be filtered
off. 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, 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 devices is
correct.
2. Check that a unicast route is available between the two devices 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.
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.