3Com S7902E, Configuration Manual

Page: 2206 / 2621

1-15
# Display the DLDP configuration information on all the DLDP-enabled ports of Device A.
[DeviceA] display dldp
DLDP global status : enable
DLDP interval : 6s
DLDP work-mode : enhance
DLDP authentication-mode : none
DLDP unidirectional-shutdown : auto
DLDP delaydown-timer : 2s
The number of enabled ports is 2.
Interface GigabitEthernet2/0/1
DLDP port state : advertisement
DLDP link state : up
The neighbor number of the port is 1.
Neighbor mac address : 0000-0000-0101
Neighbor port index : 59
Neighbor state : two way
Neighbor aged time : 11
Interface GigabitEthernet2/0/2
DLDP port state : advertisement
DLDP link state : up
The neighbor number of the port is 1.
Neighbor mac address : 0000-0000-0102
Neighbor port index : 59
Neighbor state : two way
Neighbor aged time : 11
The output information indicates that both GigabitEthernet 2/0/1 and GigabitEthernet 2/0/2 are in
Advertisement state and the links are up, which means unidirectional links are not detected and the two
ports are restored.
Troubleshooting
Symptom:
Two DLDP-enabled devices, Device A and Device B, are connected through two fiber pairs, in which
two fibers are cross-connected. The unidirectional links cannot be detected; all the four ports involved
are in Advertisement state.
Analysis:
The problem can be caused by the following.
z
The intervals for sending Advertisement packets on Device A and Device B are not the same.
z
DLDP authentication modes/passwords on Device A and Device B are not the same.
Solution:
Make sure the interval for sending Advertisement packets, the authentication mode, and the password
on Device A and Device B are the same.