HP A5120 EI Configuration Manual page 54

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
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
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:
<DeviceA>
%Jan 18 17:47:33:869 2010 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet1/0/49 link status
is UP.
%Jan 18 17:47:35:894 2010 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet1/0/50 link status
is UP.
The output shows that the link status of both GigabitEthernet 1/0/49 and GigabitEthernet 1/0/50 is
now up.
2010 DeviceA DLDP/1/TrapOfUnidirectional:
2010 DeviceA DLDP/1/TrapOfUnidirectional:
49
-Slot=1; Trap
-Slot=1; Trap