Exchange Cluster Help Needed

All;

I am monitoring a Microsoft Exchange cluster (4 servers), and am only expected to see a pair of these running all services, not all four.  I'd like to set a condition whereby Exchange goes RED only if the active, or other pair, is red as well.

Here are the two processes that go RED on the inactive pair:

"Microsoft Exchange Information Store" "Microsoft Exchange System Attendant"

My clients are using a BigBrother agent, and my server is Xymon latest.

Thank you,

.vp