3Com S7906E - Switch, Configuration Manual

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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
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. 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 1-1 . 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 1-2 .
Figure 1-1 Unidirectional fiber link: cross-connected fibers
Device A
GE2/0/1
GE2/0/2
Device B
GE2/0/1 GE2/0/2
PC