The Depends Tag

Fellow Hobbit users,

I need a little help with something, it has stumped me...

I have two hosts on the same network, if one goes down. The other will be down also because of a switch issue. I don't want to receive two alerts. So I wrote in the depends tag, is this correct format???

192.168.192.20 toronto # trace conn

192.168.192.21 oriole # trace conn depends=(conn:toronto/conn)

If toronto is down and oriole is down, I just one one email alert.

Thanks for the help, michael