z To ensure unidirectional links can be detected, make sure DLDP is enabled on both sides; and theinterval for sending advertisement packets, authentication mode, and password are the same onboth sides.z The interval for sending advertisement packets ranges from 1 to 100 seconds and defaults to 5seconds. You can adjust this setting as needed to enable DLDP to respond in time to link failures.If the interval is too long, STP loops may occur before unidirectional links are terminated; if theinterval is too short, network traffic may increase in vain and available bandwidth decreases.Normally, the interval is shorter than one-third of the STP convergence time, which is generally 30seconds.z DLDP does not process any link aggregation control protocol (LACP) event, and treats each link inthe aggregation group as independent.z When connecting two DLDP-enabled devices, make sure the software running on them is of thesame version. Otherwise, DLDP may operate improperly.z When you use the dldp enable/dldp disable command in system view to enable/disable DLDP onall optical ports of the switch, the configuration takes effect on the existing optical ports, instead ofthose added subsequently.z Make sure the authentication mode and password configured on both sides are the same for DLDPto operate properly.z When DLDP works in enhanced mode, the system can identify two types of unidirectional links:one is caused by fiber cross-connection and the other is caused by one fiber being not connectedor being disconnected.z When DLDP works in normal mode, the system can identify unidirectional links caused by fibercross-connection.z When the device is busy with services and the CPU utilization is high, DLDP may issue mistakenreports. You are recommended to configure the operating mode of DLDP as manual afterunidirectional links are detected, so as to reduce the influence of mistaken reports.Resetting DLDP StateYou can reset the DLDP state for the ports shut down by DLDP due to unidirectional links to enableDLDP detection again.This function is only applicable to ports that are in DLDP down state.Follow these steps to reset DLDP state:To do … Use the command … Remarkssystem-viewReset DLDP state for all theports shut down by DLDP dldp resetinterface interface-typeinterface-numberReset the DLDP state for a portshut down by DLDPdldp resetSelect either of the two.17-9
