Operation Manual – DLDP
H3C S3100 Series Ethernet Switches Chapter 1 DLDP Configuration
1-1
Chapter 1 DLDP Configuration
 Note:
Only S3100-EI Series switches support DLDP feature.
1.1 Overview
1.1.1 Introduction
You may have encountered unidirectional links in networking. When a unidirectional
link occurs, 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 spanning tree protocol (STP) loops.
Unidirectional links can be caused by
z Fiber cross-connection, as shown in Figure 1-1
z Fibers that are not connected or disconnected, as shown in Figure 1-2, the hollow
lines in which refer to fibers that are not connected or disconnected.
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.
SwitchB
SwitchA
PC
GE1/1/1
SwitchB
SwitchA
PC
SwitchB
SwitchA
PC
SwitchB
SwitchA
PC
GE1/1/1
GE1/1/2
GE1/1/2
Figure 1-1 Fiber cross-connection
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