H3C S5120-EI Series User Manual

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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
The interval for sending Advertisement
packets applies to all the DLDP-enabled ports.
z Set the interval for sending Advertisement packets to a value not 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
DelayDown timer setting applies
to all the DLDP-enabled ports.
Setting the Port Shutdown Mode
On detecting a unidirectional link, the ports can be shut down in one of the following two modes.

H3C S5120-EI Series Specifications

General

Brand	H3C
Model	S5120-EI Series
Category	Switch
Language	English