Reload pf and default gateway after reboot - Interface needs time to activate

["Steven N. Fettig" <openbsd_(_at_)_stevenfettig_(_dot_)_com>]

I have found a few tidbits on the web and in the mailing list on how to 
reload pf rules after given sets of time, but none really apply to my 
situation.  I have two interfaces that take a bit of time to activate 
(T1's on a PCI CSU/DSU adapter).  By the time they are active, netstart 
and pf rules have already been run (default block for pf and a localhost 
gateway setup for netstart).  I would like to set up a script so that 
after a given bit of time, it checks to see whether the interfaces are 
active (via ifconfig) and re-sets the default gateway and re-runs the pf 
ruleset.  Is this best done with a script run @reboot in crontab or some 
other mechanism?  Advice would be greatly appreciated.

Steve