H3C Technologies H3C S7500E Series Switches - Manual (Page 61)

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Setting the Interval for Sending Advertisement Packets
DLDP detects unidirectional links by sending Advertisement packets. To ensure that DLDP can detect
unidirectional links in time without affecting network performance, set the advertisement interval
appropriately depending on your network environment. Typically, the interval should be set shorter
than one third of the STP convergence time. If the interval is set too long, STP loops may occur before
unidirectional links are detected and shut down. If the interval is set too short, the number of
advertisement packets will increase. In most cases, you are recommended to use the default.
Follow these steps to set the interval to send Advertisement packets:
To do… Use the command… Remarks
Enter system view system-view —
Set the interval to send
Advertisement packets
dldp interval time
Optional
5 seconds by default
z The interval to send Advertisement packets applies to all DLDP-enabled ports.
z To enable DLDP to operate properly, make sure the intervals to send Advertisement packets on
both sides of a link are the same.
Setting the DelayDown Timer
On some ports, when the Tx line fails, the port goes down and then comes up again, causing optical
signal jitters on the Rx line. When a port goes down due to a Tx failure, the device transits to the
DelayDown state instead of the Inactive state to prevent the corresponding neighbor entries from
being removed. In the same time, the device triggers the DelayDown timer. If the port goes up before
the timer expires, the device restores the original state; if the port remains down when the timer
expires, the devices transits to the Inactive state.
Follow these steps to set the DelayDown timer
To do… Use the command… Remarks
Enter system view system-view —
Set the DelayDown timer dldp delaydown-timer time
Optional
1 second by default
DelayDown timer setting applies to all DLDP-enabled ports.