try assigning different udp port for broadcast in both the clusters, default port used is #udpport 694 you also need them to be running in different chroot environments.
Per
--- Original message follows ---
Subject: Re: Two sets of Heartbeat HTTPD clusters on same subnet
From: "Kumar, Ashish" <xml.devel@xxxxxxxxx>
To: "CentOS mailing list" <centos@xxxxxxxxxx>
Date: 01-04-2009 18:03
> Is it possible to have two sets of clusters in the one IP subnet?
Indeed, it is
> If yes what do I have to change so these clusters don't send messages
> to the wrong nodes.
Somebody might be able to help if you post your configuration files
(ha.cf and haresources) for both clusters.
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