Chassis HA - Link Preemption Mechanism

Description:

The Link Preemption Mechanism prevents constant Chassis fail-over and failback whenever there is interface link flapping.
When you enable this feature, an interface state that changes from down to up, is only considered 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 these commands from gclish:

> fw ctl set int fwha_ch_if_preempt_time < preemption time >

> update_conf_file fwkern.conf fwha_ch_if_preempt_time=< preemption time >

Sample commands that set the preemption time to 20 seconds:

> fw ctl set int fwha_ch_if_preempt_time 20

> update_conf_file fwkern.conf fwha_ch_if_preempt_time=20

Deactivation:

To disable Link Preemption Mechanism, run these commands from gclish:

> fw ctl set int fwha_ch_if_preempt_time 0	

> update_conf_file fwkern.conf fwha_ch_if_preempt_time=0

Verification:

To check the preemption time value, run this command from gclish:

> fw ctl get int fwha_ch_if_preempt_time