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There Is No (S, G) Entry in the SA Cache
Fault Description
MSDP fails to send (S, G) entries through Source-Active (SA) messages.
Fault Analysis
- The import-source command forwards (S, G) entries in a local domain to the remote MSDP peer through SA messages. If acl is not specified, the device filters all the (S, G) entries.
- If the import-source command is not configured, the device sends all the (S, G) entries in the local domain. When MSDP fails to send (S, G) entries in the local domain through SA messages, check whether the import-source command is configured and correct.
Procedure
- Check whether the two devices that will be configured as MSDP peers learn ARP entries from each other.
Run the display arp command to check whether two devices learn ARP entries from each other.
- Check whether there is a reachable unicast route between two devices that will be configured as MSDP peers.
Run the display ip routing-table command to check whether there is a unicast route between the local MSDP peer and the remote MSDP peer.
- Check that the interface address of the MSDP peers is correct.
Run the display current-configuration command to check whether the local interface address is the same as the address of the MSDP peer.
- Check whether the rule for filtering SA messages is configured.
Run the display this command in the MSDP view to check whether import-source is configured with a specified acl, and the ACL rule is set to filter (S, G) information.