Trent,
The lack of mention of ME in the 8821 DG in fact means that this setup is not officially supported. Which doesn't mean that it won't work .. but what it does mean is that, if the customer should open a TAC case, and if we should need to escalate to the 8821 team for help ... they can (and likely will) tell us to go away, because it's not officially supported.
Hth,
Aaron (TAC)