H3C Technologies H3C S10500 Series Switches - Manual (Page 54)

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DLDP link state : up
The neighbor number of the port is 1.
Neighbor mac address : 0023-8956-3600
Neighbor port index : 60
Neighbor state : two way
Neighbor aged time : 12
The output shows that both GigabitEthernet 1/0/49 and GigabitEthernet 1/0/50 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
terminal monitor
terminal logging
terminal trapping
The following log and trap information is displayed on Device A:
#Jan 18 17:36:18:798 2010 DeviceA DLDP/1/TrapOfUnidirectional: -Slot=1; Trap
1.3.6.1.4.1.25506.2.43.2.1.1 : DLDP detects a unidirectional
link in port 17825792.
%Jan 18 17:36:18:799 2010 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet1/0/49 link status
is DOWN.
%Jan 18 17:36:18:799 2010 DeviceA DLDP/3/DLDP_UNIDIRECTION_AUTO: -Slot=1; DLDP detects
a unidirectional link on port GigabitEthernet1/0/49. 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=1; Trap
1.3.6.1.4.1.25506.2.43.2.1.1 : DLDP detects a unidirectional
link in port 17825793.
%Jan 18 17:36:20:189 2010 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet1/0/50 link status
is DOWN.
%Jan 18 17:36:20:190 2010 DeviceA DLDP/3/DLDP_UNIDIRECTION_AUTO: -Slot=1; DLDP detects
a unidirectional link on port GigabitEthernet1/0/50. 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=1; In
enhanced DLDP mode, port GigabitEthernet1/0/49 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 the link status of both GigabitEthernet 1/0/49 and GigabitEthernet 1/0/50 is
down, and 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: GigabitEthernet1/0/49 link status
is UP.