H3C Technologies H3C S12500 Series Switches User Manual
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Neighbor aged time : 12
The output shows that both Gigabitethernet 2/0/1 and Gigabitethernet 2/0/2 are in
Advertisement state, which means both links are bidirectional.
# Enable system information monitoring on Device A, and enable the display of log and trap
information.
[DeviceA] quit
The following log and trap information is displayed on Device A:
#Jan 18 17:36:18:798 2010 DeviceA DLDP/1/TrapOfUnidirectional: -Slot=2; Trap
1.3.6.1.4.1.25506.2.43.2.1.1
unidirectional link in port 17825792.
%Jan 18 17:36:18:799 2010 DeviceA IFNET/3/LINK_UPDOWN: Gigabitethernet2/0/1 link
status is DOWN.
%Jan 18 17:36:18:799 2010 DeviceA DLDP/3/DLDP_UNIDIRECTION_AUTO: -Slot=2; DLDP
detects a unidirectional link on port Gigabitethernet2/0/1. The transceiver has
malfunction in the Tx direction or cross-connected links exist between the local device
and its neighbor. The shutdown mode is AUTO. DLDP shuts down the port.
#Jan 18 17:36:20:189 2010 DeviceA DLDP/1/TrapOfUnidirectional: -Slot=2; Trap
1.3.6.1.4.1.25506.2.43.2.1.1
unidirectional link in port 17825793.
%Jan 18 17:36:20:189 2010 DeviceA IFNET/3/LINK_UPDOWN: Gigabitethernet2/0/2 link
status is DOWN.
%Jan 18 17:36:20:190 2010 DeviceA DLDP/3/DLDP_UNIDIRECTION_AUTO: -Slot=2; DLDP
detects a unidirectional link on port Gigabitethernet2/0/2. The transceiver has
malfunction in the Tx direction or cross-connected links exist between the local device
and its neighbor. The shutdown mode is AUTO. DLDP shuts down the port.
%Jan 15 16:54:56:040 2010 DeviceA DLDP/3/DLDP_UNIDIRECTION_AUTO_ENHANCE: -Slot=2; In
enhanced DLDP mode, port Gigabitethernet2/0/1 cannot detect its aged-out neighbor.
The transceiver has malfunction in the Tx direction or cross-connected links exist
between the local device and its neighbor. The shutdown mode is AUTO. DLDP shuts down
the port.
The output shows that both Gigabitethernet 2/0/1 and Gigabitethernet 2/0/2 are down. DLDP
has detected a unidirectional link on both ports, and has automatically shut them down.
Assume that in this example, the unidirectional links are caused by cross-connected fibers. Correct
the fiber connections on detecting the unidirectional link problem. As a result, the ports shut down
by DLDP automatically recover, and Device A displays the following log information:
%Jan 18 17:47:33:869 2010 DeviceA IFNET/3/LINK_UPDOWN: Gigabitethernet2/0/1 link
status is UP.
%Jan 18 17:47:35:894 2010 DeviceA IFNET/3/LINK_UPDOWN: Gigabitethernet2/0/2 link
status is UP.
The output shows that the link status of both Gigabitethernet 2/0/1 and Gigabitethernet 2/0/2 is
now up.