H3C Technologies H3C S6800 Series Switches User Manual
Page 18
10
Neighbor MAC address: 0023-8956-3600
Neighbor port index: 2
Neighbor state: Confirmed
Neighbor aged time: 12s
The output shows that both FortyGigE 1/0/1 and FortyGigE 1/0/2 are in Bidirectional state,
which means both links are bidirectional.
# Enable the monitoring of logs on the current terminal on Device A, and set the lowest level of the
logs that can be output to the current terminal to 6.
[DeviceA] quit
The following log information is displayed on Device A:
status is DOWN.
%Jul 11 17:40:31:091 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
FortyGigE1/0/1 is DOWN.
%Jul 11 17:40:31:677 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/2 link status is
DOWN.
%Jul 11 17:40:31:678 2012 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
FortyGigE1/0/2 is DOWN.
%Jul 11 17:40:38:544 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/1 link status is
UP.
%Jul 11 17:40:38:836 2012 DeviceA IFNET/3/PHY_UPDOWN: FortyGigE1/0/2 link status is
UP.
The output shows that the port status of both FortyGigE 1/0/1 and FortyGigE 1/0/2 is down and
then up, but the link status of them is always down.
# Display the DLDP configuration globally and of all the DLDP-enabled ports.
DLDP global status: Enabled
DLDP advertisement interval: 5s
DLDP authentication-mode: None
DLDP unidirectional-shutdown mode: Auto
DLDP delaydown-timer value: 1s
Number of enabled ports: 2
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 and automatically
shuts down the two ports.
The unidirectional links are caused by cross-connected fibers. Correct the fiber connections. As a
result, the ports shut down by DLDP automatically recover, and Device A displays the following log
information: