3Com S7906E - Switch, Руководство по настройке

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To do… Use the command… Remarks
Set DLDP mode
dldp work-mode { enhance |
normal }
Optional
Normal by default
Setting the Interval for Sending Advertisement Packets
You can set the interval for sending Advertisement packets to enable unidirectional links to be detected
in time.
Follow these steps to set the interval for sending Advertisement packets:
To do… Use the command… Remarks
Enter system view system-view —
Set the interval for
sending Advertisement
packets
dldp interval time
Optional
5 seconds by default
z
The interval for sending Advertisement packets applies to all DLDP-enabled ports.
z
Set the interval for sending Advertisement packets to a value no longer than one-third of the STP
convergence time. If the interval is too long, STP loops may occur before unidirectional links are
torn down, and it takes a long time for the device to detect unidirectional links, thus causing more
traffic forwarding errors; if the interval is too short, unnecessary Advertisement packets can be
generated to consume bandwidth. Therefore, you are recommended to use the default value.
z
To enable DLDP to operate properly, make sure the intervals for sending 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