H3C S5120-EI Series, Operation Manual

Page: 802 / 1191

1-1
1
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 appear in networks . On a unidirectional link, one end can receive
packets from the other end but the other end cannot. For example, if two switches, Switch A and Switch
B, are connected via a fiber pair, one used for sending packets from A to B and the other for sending
packets from B to A, the link between the two switches is a bidirectional link (two-way link). If one of
these fibers gets broken, the link becomes a unidirectional link (one-way link).
Unidirectional links result in problems such as loops in an STP-enabled network.
There are two types of unidirectional fiber links. One occurs when fibers are cross-connected, and the
other occurs when one end of a fiber is not connected or one fiber of a fiber pair gets broken.
Figure 1-1 .
shows a correct fiber connection and two types of unidirectional fiber connection.