R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

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malfunction in the Tx direction or cross-connected links exist between the local device
and its neighbor. The shutdown mode is AUTO. DLDP shuts down the port.
#Jan 18 17:36:20:189 2010 RouterA DLDP/1/TrapOfUnidirectional: -Slot=2; Trap
1.3.6.1.4.1.255062.43.2.1.1 : DLDP detects a unidirectional link in port 17825793.
%Jan 18 17:36:20:189 2010 RouterA IFNET/3/LINK_UPDOWN: GigabitEthernet3/0/2 link
status is DOWN.
%Jan 18 17:36:20:190 2010 RouterA DLDP/3/DLDP_UNIDIRECTION_AUTO: -Slot=2; DLDP
detects a unidirectional link on port GigabitEthernet3/0/2. The transceiver has
malfunction in the Tx direction or cross-connected links exist between the local device
and its neighbor. The shutdown mode is AUTO. DLDP shuts down the port.
%Jan 15 16:54:56:040 2010 RouterA DLDP/3/DLDP_UNIDIRECTION_AUTO_ENHANCE: -Slot=2; In
enhanced DLDP mode, port GigabitEthernet3/0/1 cannot detect its aged-out neighbor.
The transceiver has malfunction in the Tx direction or cross-connected links exist
between the local device and its neighbor. The shutdown mode is AUTO. DLDP shuts down
the port.
The output indicates that the link status of both GigabitEthernet 3/0/1 and GigabitEthernet
3/0/2 is down, and DLDP has detected a unidirectional link on both ports and has
automatically shut them down.
Assume that in this example, the unidirectional links are caused by cross-connected fibers.
Correct the fiber connections on detecting the unidirectional link problem. As a result, the ports
shut down by DLDP automatically recover, and Router A displays the following log information:
<RouterA>
%Jan 18 17:47:33:869 2010 RouterA IFNET/3/LINK_UPDOWN: GigabitEthernet3/0/1 link
status is UP.
%Jan 18 17:47:35:894 2010 RouterA IFNET/3/LINK_UPDOWN: GigabitEthernet3/0/2 link
status is UP.
The output indicates that the link status of both GigabitEthernet 3/0/1 and GigabitEthernet
3/0/2 is now up.
Manually shutting down unidirectional links
Network requirements
As shown in Figure 10, Router A and Router B are connected with two fiber pairs.
Configure DLDP to send information when a unidirectional link is detected, which reminds the network
administrator to manually shut down the faulty port.