4-1
4 DLDP Configuration
When performing DLDP configuration, go to these sections for information you are interested in:
z Overview
z DLDP Configuration Task List
z Enabling DLDP
z Setting DLDP Mode
z Setting the Interval for Sending Advertisement Packets
z Setting the DelayDown Timer
z Setting the Port Shutdown Mode
z Configuring DLDP Authentication
z Resetting DLDP State
z Displaying and Maintaining DLDP
z DLDP Configuration Example
z Troubleshooting
Overview
Background
Sometimes, unidirectional links may appear in networks. On a unidirectional link, one end can receive
packets from the other end but the other end cannot. Unidirectional links result in problems such as
loops in an STP-enabled network.
As for fiber links, two kinds of unidirectional links exist. One occurs when fibers are cross-connected,
as shown in
Figure 4-1. The other occurs when one end of a fiber is not connected or one fiber of a
fiber pair gets disconnected, as illustrated by the hollow arrows in
Figure 4-2.
Figure 4-1 Unidirectional fiber link: cross-connected fibers
Device A
GE1/0/50 GE1/0/51
Device B
PC
GE1/0/50
GE1/0/51
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