Troubleshooting - H3C S5120-EI Series Operation Manual

[DeviceA] dldp work-mode enhance
# Set the port shutdown mode as auto mode.
[DeviceA] dldp unidirectional-shutdown auto
# Enable DLDP globally.
[DeviceA] dldp enable
# Check the information about DLDP.
[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 GigabitEthernet1/0/50
DLDP port state : disable
DLDP link state : down
The neighbor number of the port is 0.
Interface GigabitEthernet1/0/51
DLDP port state : disable
DLDP link state : down
The neighbor number of the port is 0.
The output information indicates that both GigabitEthernet 1/0/50 and GigabitEthernet 1/0/51 are in
Disable state and the links are down, which means unidirectional links are detected and the two ports
are thus shut down.
# Reset DLDP state for the ports shut down by DLDP.
[DeviceA] dldp reset
2) Configuration on Device B
The configuration on Device B is the same as that on Device A and is thus omitted.
If two fibers are cross-connected, all the four ports involved will be shut down by DLDP.

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.
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