H3C S5100-SI Operation Manual

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H3C S5100-SI Operation Manual Manual pdf 170 page image

1-11 DLDP ConfigurationWhen configuring DLDP, go to these sections for information you are interested in:z Overviewz DLDP Fundamentalsz DLDP Configurationz DLDP Configuration ExampleOverviewDevice link detection protocol (DLDP) is an H3C technology for dealing with unidirectional links thatmay occur in a network.If two switches, A and B, are connected via a pair of optical fiber cables, one used for sending from A toB, the other sending from B to A, it is a bidirectional link (two-way link). If one of these fibers gets broken,this is a unidirectional link (one-way link).When a unidirectional link appears, the local device can receive packets from the peer device throughthe link layer, but the peer device cannot receive packets from the local device. Unidirectional link cancause problems such as network loops.As for fiber links, two kinds of unidirectional links exist:z Fiber cross-connection, as shown in Figure 1-1z Fibers that are not connected or are broken, as shown in Figure 1-2, the hollow lines in which referto fibers that are not connected or are broken.Figure 1-1 Fiber cross-connection