H3C Technologies H3C S7500E Series Switches - Manual (Page 70)

6-20
The output indicates 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
<DeviceA> terminal monitor
<DeviceA> terminal logging
<DeviceA> terminal trapping
The following log and trap information is displayed on Device A:
<DeviceA>
#Jan 18 18:10:38:481 2010 DeviceA DLDP/1/TrapOfUnidirectional: -Slot=2;
h3cDLDPUnidirectionalPort : DLDP detects a unidirectional link in port 17825792.
%Jan 18 18:10:38:481 2010 DeviceA DLDP/3/DLDP_UNIDIRECTION_MANUAL: -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 MANUAL. The port needs to be shut down by the user.
#Jan 18 18:10:38:618 2010 DeviceA DLDP/1/TrapOfUnidirectional: -Slot=2;
h3cDLDPUnidirectionalPort : DLDP detects a unidirectional link in port 17825793.
%Jan 18 18:10:38:618 2010 DeviceA DLDP/3/DLDP_UNIDIRECTION_MANUAL: -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 MANUAL. The port needs to be shut down by the user.
The output above indicates that DLDP has detected a unidirectional link on both GigabitEthernet 2/0/1
and GigabitEthernet 2/0/2, and is asking you to shut down the faulty ports manually.
After you shut down GigabitEthernet 2/0/1 and GigabitEthernet 2/0/2, the following log information is
displayed:
<DeviceA> system-view
[DeviceA] interface gigabitethernet 2/0/1
[DeviceA-GigabitEthernet2/0/1] shutdown
%Jan 18 18:16:12:044 2010 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/1 link status is
DOWN.
[DeviceA-GigabitEthernet2/0/1] quit
[DeviceA] interface gigabitethernet 2/0/2
[DeviceA-GigabitEthernet2/0/2] shutdown
%Jan 18 18:18:03:583 2010 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/2 link status is
DOWN.
The output above indicates that the link status of both GigabitEthernet 2/0/1 and GigabitEthernet 2/0/2
is down.
Assume that in this example, the unidirectional links are caused by cross-connected fibers. Correct
the fiber connections, and then bring up the ports shut down earlier.
# On Device A, bring up GigabitEthernet 2/0/1 and GigabitEthernet 2/0/2:
[DeviceA-GigabitEthernet2/0/2] undo shutdown
[DeviceA-GigabitEthernet2/0/2]
%Jan 18 18:22:11:698 2010 DeviceA IFNET/3/LINK_UPDOWN: GigabitEthernet2/0/2 link status is
UP.
[DeviceA-GigabitEthernet2/0/2] quit
[DeviceA] interface gigabitethernet 2/0/1
[DeviceA-GigabitEthernet2/0/1] undo shutdown