[CentOS] iproute2 custom tables and rules the CentOS way...

Hi all;

I have a custom iproute2 table and a few rules to go along with it
(CentOS 5) -- I have added the table to /etc/iproute2/rt_tables.

if-up and friends doesn't seem to handle this real gracefully.  How are
those of you out there doing something similar managing this
customization?

I don't really want to muck with /etc/init.d/network or the if-up
scripts to avoid breaking upgrades.  rc.local my best bet?

Thanks,
Ray