I need more DMZs than physical interfaces in my ASA 5520, so I configure subinterfaces and vlans. When I applied the failover config I saw in the subinterfaces a "Not-monitored" message and failover doesn't work if the physical interface is down.
Interface DMZ27 (172.18.244.126): Normal (Not-Monitored)
Interface DMZ28 (18.104.22.168): Normal (Not-Monitored)
Interface DMZ29 (172.18.244.94): Normal (Not-Monitored)
I tried to use physical interface for monitoring but It doesn't pass traffic and vlan configuration is not allowed.
Thanks in advance.