failover interface with ethMc and ethoa etc

Hiye, In DD2200 can you add one from build in ports like ethMc and one from added I/O module like ethoa in a veth0 failover interface? I am 99.9 sure its possible but still can't find a single document says its possible? Thanks a Million in advance.In my Configuraton

''net show hardware'' can see outpurt for '' int ethMc''

Link status =No

state= up

but for ethoa

Link status =yes

state= running

Thanks a Million in advance.

Meera