If i use sub interfaces for failover in case if any one the sub interfaces goes to shutdown on the physical interface will the failover occur or only if the physical interface goes down?
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.
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