Setting The Delaydown Timer; Setting The Port Shutdown Mode - HP A5830 series Configuration Manual

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.
To set the interval to send Advertisement packets:
To do...
• Enter system view
• Set the interval to send
Advertisement packets
The interval sending 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 device transits to the
DelayDown state instead of the Inactive state to prevent the corresponding neighbor entries from being
removed. At 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
device transits to the Inactive state.
To set the DelayDown timer:
To do...
• Enter system view
• Set the DelayDown timer
DelayDown timer setting applies to all 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.
Manual mode. This mode applies to low performance networks, where normal links may be treated
•
as unidirectional links. It protects data traffic transmission against false unidirectional links. In this
mode, DLDP only detects unidirectional links, but does not shut down unidirectional link ports
automatically. Instead, the DLDP state machine generates log and traps to prompt you to shut down
unidirectional link ports manually with the shutdown command. HP recommends that you 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.
To set port shutdown mode:
To do...
• Enter system view
Use the command...
system-view
dldp interval time
Use the command...
system-view
dldp delaydown-timer time
Use the command...
system-view
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Remarks
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Optional
5 seconds by default
Remarks
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Optional
1 second by default
Remarks
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