H3C Technologies H3C S12500-X Series Switches - Manual (Page 41)

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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 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:
<DeviceA>%Jul 11 17:42:57:709 2013 DeviceA IFNET/3/PHY_UPDOWN:
Ten-GigabitEthernet1/0/1 link status is DOWN.
%Jul 11 17:42:58:603 2013 DeviceA IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/2 link
status is DOWN.
%Jul 11 17:43:02:342 2013 DeviceA IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/1 link
status is UP.
%Jul 11 17:43:02:343 2013 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface Ten-GigabitEthernet1/0/1. The neighbor's system MAC is
0023-8956-3600, and the port index is 1.
%Jul 11 17:43:02:344 2013 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface Ten-GigabitEthernet1/0/1.
%Jul 11 17:43:02:353 2013 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
Ten-GigabitEthernet1/0/1 is UP.
%Jul 11 17:43:02:357 2013 DeviceA IFNET/3/PHY_UPDOWN: Ten-GigabitEthernet1/0/2 link
status is UP.
%Jul 11 17:43:02:362 2013 DeviceA DLDP/6/DLDP_NEIGHBOR_CONFIRMED: A neighbor was
confirmed on interface Ten-GigabitEthernet1/0/2. The neighbor's system MAC is
0023-8956-3600, and the port index is 2.
%Jul 11 17:43:02:362 2013 DeviceA DLDP/6/DLDP_LINK_BIDIRECTIONAL: DLDP detected a
bidirectional link on interface Ten-GigabitEthernet1/0/2.
%Jul 11 17:43:02:368 2013 DeviceA IFNET/5/LINK_UPDOWN: Line protocol on the interface
Ten-GigabitEthernet1/0/2 is UP.
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 up and their DLDP neighbors are determined.
Manually shutting down unidirectional links
Network requirements
As shown in Figure 11 , Device A and Device B are connected with two fiber pairs.
Configure DLDP to detect unidirectional links. When a unidirectional link is detected, the administrator
must manually shut down the port.