3Com Switch 8800 Advanced Software V5 Configuration Guide

Troubleshooting MSDP 635
1 1 0 0 0 0
Peer’s Address State Up/Down time AS SA Count Reset Count
192.168.3.1 UP 00:16:40 ? 13 0
Troubleshooting
MSDP
MSDP Peers Stay in
Down State
Symptom
The configured MSDP peers stay in the 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 there is a consistency between the local
interface address and the MSDP peer address configured on the switch.
■ If no route is available between the MSDP peers, the TCP connection setup will
also fail.
Solution
1 Check that a route is available between the devices. Carry out the display ip
routing-table command to check whether the unicast route between the
switches 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 interface address consistency between the MSDP peers. Use the display
current-configuration command to verify that the local interface address and
the MSDP peer address of the remote switch are the same.
No SA Entries in the
Device’s SA Cache
Symptom
MSDP fails to send (S, G) entries through SA messages.
Analysis
■ The import-source command is used 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
correct configured.
Solution
1 Check that a route is available between the devices. Carry out the display ip
routing-table command to check whether 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.