Operation Manual – DLDPH3C S3100-52P Ethernet Switch Chapter 1 DLDP Configuration1-1Chapter 1 DLDP ConfigurationWhen configuring DLDP, go to these sections for information you are interested in:z Overviewz DLDP Configurationz DLDP Configuration Example1.1 Overview1.1.1 IntroductionA special kind of links, namely, unidirectional links, may occur in a network. When aunidirectional link appears, the local device can receive packets from the peer devicethrough 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 byz Fiber cross-connection, as shown in Figure 1-1z Fibers that are not connected or disconnected, as shown in Figure 1-2, the hollowlines 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 cableor copper twisted pair (such as super category 5 twisted pair). If DLDP finds aunidirectional link, it disables the related port automatically or prompts you to disable itmanually according to the configurations, to avoid network problems.Figure 1-1 Fiber cross-connection
