Link Preemption Mechanism
The Link Preemption Mechanism prevents constant Chassis fail-over and failback when there is interface link flapping. When you enable this feature, an interface state that changes from DOWN to UP, is only included in the Chassis grade if the link state is up for X seconds (default is 10 sec).
Configuration:
The Link Preemption Mechanism is enabled by default with a preemption time of 10 seconds.
To configure the preemption time, run:
> fw ctl set int fwha_ch_if_preempt_time <preemp_time>
> update_conf_file fwkern.conf fwha_ch_if_preempt_time=<preemp_time>
Parameter
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Description
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<preemp_time>
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Link Preemption Mechanism time
Default: 10 seconds
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Example
> fw ctl set int fwha_ch_if_preempt_time 20
> update_conf_file fwkern.conf fwha_ch_if_preempt_time=20
To disable Link Preemption Mechanism:
Run:
> fw ctl set int fwha_ch_if_preempt_time 0
> update_conf_file fwkern.conf fwha_ch_if_preempt_time=0
To make sure the preemption time value is correct:
Run:
> fw ctl get int fwha_ch_if_preempt_time
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