Enable monitoring on SubInterfaces on Primary Cisco ASA
By default, monitoring physical interfaces is enabled and monitoring subinterfaces is disabled. You can monitor up to 250 interfaces on a unit. You can control which interfaces affect your failover policy by disabling the monitoring of specific interfaces and enabling the monitoring of others. This lets you exclude interfaces attached to less critical networks from affecting your failover policy.
You can turn off monitoring the interface:
no monitor-interface if_name
To Monitor Interface
monitor-interface if_name
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