Chapter 1 Dldp Configuration - H3C S5100-SI Series Operation Manual

Operation Manual – DLDP
H3C S5100-SI/EI Series Ethernet Switches

Chapter 1 DLDP Configuration

When configuring DLDP, go to these sections for information you are interested in:
Overview
DLDP Configuration
DLDP Configuration Example
1.1 Overview
1.1.1 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.
Unidirectional links can be caused by
Fiber cross-connection, as shown in
Fibers that are not connected or disconnected, as shown in
lines in which 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
Figure 1-1
1-1
Chapter 1 DLDP Configuration
Figure 1-2, the hollow