H3C S3600 Series Operation Manual

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H3C S3600 Series Operation Manual Manual pdf 2 page image

Operation Manual – DLDPH3C S3600 Series Ethernet Switches-Release 1510 Chapter 1 DLDP Configuration1-1Chapter 1 DLDP Configuration1.1 DLDP OverviewYou may have encountered unidirectional links, namely, one-way audio, in networking.When a unidirectional link occurs, the local device can receive packets from the peerdevice through the link layer, but the peer device cannot receive packets from the localdevice.Unidirectional links can be divided into two types: one is caused by fibercross-connection, and the other is caused by a fiber being not connected or beingdisconnected. The cross-connected fibers in Figure 1-1 refer to optical fibers which areconnected inversely. The hollow lines in Figure 1-2 refer to fibers which are notconnected or are broken.Unidirectional links can cause many problems, such as spanning tree protocol (STP)loop.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.SwitchBSwitchAPCGE2/1/3GE2/1/3 GE2/1/4GE2/1/4SwitchBSwitchAPCGE2/1/3GE2/1/3 GE2/1/4GE2/1/4SwitchBSwitchAPCGE2/1/3GE2/1/3 GE2/1/4GE2/1/4SwitchBSwitchAPCGE2/1/3GE2/1/3 GE2/1/4GE2/1/4Figure 1-1 Fiber cross-connection