H3C Technologies H3C S6800 Series Switches User Manual
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Interface FortyGigE1/0/1
DLDP port state: Unidirectional
Number of the port’s neighbors: 0 (Maximum number ever detected: 1)
Interface FortyGigE1/0/2
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 FortyGigE 1/0/1 and FortyGigE 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 FortyGigE 1/0/1.
[DeviceA] interface fortygige 1/0/1
[DeviceA-FortyGigE1/0/1] shutdown
The following log information is displayed on Device A:
[DeviceA-FortyGigE1/0/1]%Jul 12 08:34:23:717 2012 DeviceA IFNET/3/PHY_UPDOWN:
FortyGigE1/0/1 link status is DOWN.
%Jul 12 08:34:23:718 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
FortyGigE1/0/1 is DOWN.
%Jul 12 08:34:23:778 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/2 link status is
DOWN.
%Jul 12 08:34:23:779 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
FortyGigE1/0/2 is DOWN.
The output shows that the port status and link status of both FortyGigE 1/0/1 and FortyGigE
1/0/2 are now down.
# Shut down FortyGigE 1/0/2.
[DeviceA-FortyGigE1/0/1] quit
[DeviceA] interface fortygige 1/0/2
[DeviceA-FortyGigE1/0/2] shutdown
Correct the fiber connections and bring up the two ports:
# Bring up FortyGigE 1/0/2.
[DeviceA-FortyGigE1/0/2] undo shutdown
The following log information is displayed on Device A:
[DeviceA-FortyGigE1/0/2]%Jul 12 08:46:17:677 2012 DeviceA IFNET/3/PHY_UPDOWN:
FortyGigE1/0/2 link status is UP.
%Jul 12 08:46:17:678 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
FortyGigE1/0/2 is UP.
%Jul 12 08:46:17:959 2012 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface FortyGigE1/0/2. The neighbor's system MAC is 0023-8956-3600,
and the port index is 2.
%Jul 12 08:46:17:959 2012 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface FortyGigE1/0/2.
The output shows that the port status and link status of FortyGigE 1/0/2 are now up and its DLDP
neighbors are determined.
# Bring up FortyGigE 1/0/1.