H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 293)

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27
DLDP Configuration
When performing DLDP configuration, go to these sections for information you are interested in:
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Overview
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DLDP Configuration Task List
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Enabling DLDP
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Setting DLDP Mode
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Setting the Interval for Sending Advertisement Packets
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Setting the DelayDown Timer
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Setting the Port Shutdown Mode
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Configuring DLDP Authentication
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Resetting DLDP State
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Displaying and Maintaining DLDP
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DLDP Configuration Example
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Troubleshooting
The term switch in this document refers to a switch in a generic sense or an access controller
configured with the switching function unless otherwise specified.
Overview
A special kind of links, namely, unidirectional links, may occur in a network. When a unidirectional link
appears, the local device can receive packets from the peer device through the link layer, but the peer
device cannot receive packets from the local device. Unidirectional link can cause problems such as
loops in a Spanning Tree Protocol (STP) enabled network.
As for fiber links, two kinds of unidirectional links exist. One occurs when fibers are cross-connected, as
shown in
Figure 27-1 . 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 27-2 .