yum and RHEL interopability issues

[Ed Wilts <ewilts ewilts org>]

I'd like to set up my system to allow for both up2date and yum updates.
For my yum updates (DAG's repository, primarily), I'd like to update
only those packages that came from that repository and not clobber the
base.  For example, RHEL and DAG both provide rsync but I don't ever
want to install the DAG version by mistake.  If I installed a DAG
package (proftpd, for example), then I want that package updated.

I guess what I'm saying is that I want to pull updates from dag only if
the dag release is currently installed.

Is there a feature in yum I'm missing that would allow this
functionaility?

-- 
Ed Wilts, RHCE
Mounds View, MN, USA
mailto:ewilts ewilts org
Member #1, Red Hat Community Ambassador Program