if_vlan subinterfaces at boot

[Steve Bertrand]

Hi everyone,

Is there any way to create, and assign addresses to a if_vlan 
sub-interface (eg: em6.3) via rc.conf at boot?

If not, is there a documented best practice on how and where in the 
startup routine a custom script should be run from in order to perform 
the necessary commands?

I'd like to rid myself of using interface aliases if at all possible.

Regards,

Steve