H3C S5120-EI Series Configuration Manual

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H3C S5120-EI Series Configuration Manual Manual pdf 51 page image

42To set the interval to send Advertisement packets:Step Command Remarks1. Enter system view. system-view N/A2. Set the interval to sendAdvertisement packets. dldp interval time Optional.5 seconds by default.NOTE:• The interval for sending Advertisement packets applies to all DLDP-enabled ports.• To enable DLDP to operate properly, make sure the intervals for sending Advertisement packets on bothsides of a link are the same.Setting the delaydown timerOn some ports, when the Tx line fails, the port goes down and then comes up again, causing opticalsignal jitters on the Rx line. When a port goes down due to a Tx failure, the device transits to theDelayDown state instead of the Inactive state to prevent the corresponding neighbor entries from beingremoved. At the same time, the device triggers the DelayDown timer. If the port goes up before the timerexpires, the device restores the original state; if the port remains down when the timer expires, the devicetransits to the Inactive state.To set the DelayDown timer:Step Command Remarks1. Enter system view. system-view N/A2. Set the DelayDowntimer. dldp delaydown-timer time Optional.1 second by default.NOTE:DelayDown timer setting applies to all DLDP-enabled ports.Setting the port shutdown modeOn detecting a unidirectional link, the ports can be shut down in one of the following two modes:• Manual mode—This mode applies to low performance networks, where normal links may betreated as unidirectional links. It protects data traffic transmission against false unidirectional links.In this mode, DLDP only detects unidirectional links but does not automatically shut downunidirectional link ports. Instead, the DLDP state machine generates log and traps to prompt you tomanually shut down unidirectional link ports with the shutdown command. H3C recommends thatyou do as prompted. Then the DLDP state machine transits to the Disable state.• Auto mode—In this mode, when a unidirectional link is detected, DLDP transits to Disable state,generates log and traps, and sets the port state to DLDP Down.On a port with both remote OAM loopback and DLDP enabled, if the port shutdown mode is auto mode,the port will be shut down by DLDP when it receives a packet sent by itself, causing remote OAMloopback to operate improperly. To prevent this, set the port shutdown mode to manual mode.