How to mark an interace as 'down' at boot time?

[Modulok]

Trivial question,

Is there an rc.conf way to mark a network interface as being 'down' at
boot time? I could do it with a cron job, or a kernel rebuild, but I
thought there'd be some nifty rc.conf syntax. I tried this:

ifconfig_bge0="down"

The interface is marked as down in the dmesg output, but it's still up
when the boot cycle completes.
-Modulok-