H3C S5120-EI Series - Page 56

47
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
<DeviceA> terminal monitor
<DeviceA> terminal logging
<DeviceA> terminal trapping
The following log and trap information is displayed on Device A:
<DeviceA>
#Jan 18 17:36:18:798 2013 DeviceA DLDP/1/TrapOfUnidirectional: -Slot=1; Trap
1.3.6.1.4.1.25506.2.43.2.1.1<hh3cDLDPUnidirectionalPort> : DLDP detects a
unidirectional link in port 17825792.
%Jan 18 17:36:18:799 2013 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet1/0/49 link
status is DOWN.
%Jan 18 17:36:18:799 2013 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 2013 DeviceA DLDP/1/TrapOfUnidirectional: -Slot=1; Trap
1.3.6.1.4.1.25506.2.43.2.1.1<hh3cDLDPUnidirectionalPort> : DLDP detects a
unidirectional link in port 17825793.
%Jan 18 17:36:20:189 2013 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet1/0/50 link
status is DOWN.
%Jan 18 17:36:20:190 2013 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 2013 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:
<DeviceA>
%Jan 18 17:47:33:869 2013 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet1/0/49 link
status is UP.