Dldp Configuration; Overview; Introduction - H3C S5600 Series Operation Manual

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DLDP Configuration

When configuring DLDP, go to these sections for information you are interested in:

Overview

DLDP Configuration
DLDP Configuration Example
Overview

Introduction

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:
Fiber cross-connection, as shown in
Fibers that are not connected or disconnected, as shown in
refer to fibers that are not connected or disconnected.
The Device Link Detection Protocol (DLDP) can detect the link status of an optical fiber cable or copper
twisted pair (such as super category 5 twisted pair). If DLDP finds a unidirectional link, it disables the
related port automatically or prompts you to disable it manually according to the configurations, to avoid
network problems.
Figure 1-1 Fiber cross-connection
Switch A
GE1/0/50
GE1/0/50
Switch B
GE1/0/51
GE1/0/51
Host
Figure 1-1
1-1
Figure 1-2, the hollow lines in which