HP 5900 Series Configuration Manual page 44

<DeviceA> display dldp
DLDP global status: Enabled
DLDP advertisement interval: 5s
DLDP authentication-mode: None
DLDP unidirectional-shutdown mode: Manual
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
Interface Ten-GigabitEthernet1/0/1
DLDP port state: Unidirectional
Number of the port's neighbors: 0 (Maximum number ever detected: 1)
Interface Ten-GigabitEthernet1/0/2
DLDP port state: Unidirectional
Number of the port's neighbors: 0 (Maximum number ever detected: 1)
The output shows that the DLDP port status of both Ten-GigabitEthernet 1/0/1 and
Ten-GigabitEthernet 1/0/2 is unidirectional, which indicates that DLDP detects unidirectional links
on them but does not shut down the two ports.
The unidirectional links are caused by cross-connected fibers. Manually shut down the two ports:
# Shut down Ten-GigabitEthernet 1/0/1.
<DeviceA> system-view
[DeviceA] interface ten-gigabitethernet 1/0/1
[DeviceA-Ten-GigabitEthernet1/0/1] shutdown
The following log information is displayed on Device A:
[DeviceA-Ten-GigabitEthernet1/0/1]%Jul 12 08:34:23:717 2012 DeviceA
IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/1 link status is DOWN.
%Jul 12 08:34:23:718 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
Ten-GigabitEthernet1/0/1 is DOWN.
%Jul 12 08:34:23:778 2012 DeviceA IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/2 link
status is DOWN.
%Jul 12 08:34:23:779 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
Ten-GigabitEthernet1/0/2 is DOWN.
The output shows that the port status and link status of both Ten-GigabitEthernet 1/0/1 and
Ten-GigabitEthernet 1/0/2 are now down.
# Shut down Ten-GigabitEthernet 1/0/2.
[DeviceA-Ten-GigabitEthernet1/0/1] quit
[DeviceA] interface ten-gigabitethernet 1/0/2
[DeviceA-Ten-GigabitEthernet1/0/2] shutdown
Correct the fiber connections and bring up the two ports:
# Bring up Ten-GigabitEthernet 1/0/2.
[DeviceA-Ten-GigabitEthernet1/0/2] undo shutdown
The following log information is displayed on Device A:
[DeviceA-Ten-GigabitEthernet1/0/2]%Jul 12 08:46:17:677 2012 DeviceA
IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/2 link status is UP.
%Jul 12 08:46:17:678 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
Ten-GigabitEthernet1/0/2 is UP.
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