Setting Dldp Mode; Setting The Interval For Sending Advertisement Packets; Setting The Delaydown Timer - HP A5120 EI Configuration Manual

Setting DLDP mode

DLDP works in normal or enhanced mode:
 In normal mode, DLDP does not actively detect neighbors when the corresponding neighbor entries
age out. The system can identify only one type of unidirectional links: cross-connected fibers.
 In enhanced mode, DLDP actively detects neighbors when the corresponding neighbor entries age
out, so the system can identify two types of unidirectional links: cross-connected fibers and
disconnected fibers.
Follow these steps to set DLDP mode:
To do...
Enter system view
Set DLDP mode
Setting the interval for sending advertisement
packets
DLDP detects unidirectional links by sending Advertisement packets. To ensure that DLDP can detect
unidirectional links promptly without affecting network performance, set the advertisement interval
appropriately depending on your network environment. The interval should be set shorter than one third
of the STP convergence time. If the interval is too long, STP loops may occur before unidirectional links
are detected and shut down. If the interval is too short, the number of advertisement packets will increase.
HP recommends that you use the default interval in most cases.
Follow these steps to set the interval to send Advertisement packets:
To do...
Enter system view
Set the interval to send
Advertisement packets
NOTE:

The interval to send Advertisement packets applies to all DLDP-enabled ports.

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 switch transits to the
DelayDown state instead of the Inactive state to prevent the corresponding neighbor entries from being
removed. At the same time, the switch triggers the DelayDown timer. If the port goes up before the timer
expires, the switch restores the original state; if the port remains down when the timer expires, the switch
transits to the Inactive state.
Use the command...
system-view
dldp work-mode { enhance | normal }
Use the command...
system-view
dldp interval time
43
Remarks
—
Optional
Normal by default
Remarks
—
Optional
5 seconds by default