Windows 2003 Cluster IP Conflict during failover. Possible Spilt Brain Syndrome ?

Dear all,
I would like to ask if anyone had a case of IP Conflict on the Virtual Cluster IP Address resource ?
It was observed that both Windows cluster nodes presented the Virtual IP address resource at the same time.
Could I know how can such a thing happen, there are may safeguards to prevent such spilt brain symptom.
Thanks a lot.

Dear Tim & Alex
Apologies for the late reply . Forgot about the alert me feature...
Our switches are configured with a feature to lock-out (disable) any port with a duplicate IP address/MAC address.
May I know would there actually be a time for maybe for a split second where both Virtual Cluster IP addresses are presented on the NICs of both nodes ?
This incident happened again but this time the situation was during a restart of the passive node. What happened was that upon restart, the resources on the active node attempted to fail over to the passive node when I restarted the passive node. Upon login,
I then realised that the port on the restarted node was portlocked and the services stayed on the restarted node, even though It was strange for it to failover as it had not reason to ( it was running fine on the other node) . I tried to open the cluster administrator
on the node that was not restarted and it had cluster administrator in a hanged state however the service was indicated as started. The cluster administrator on the restarted node indicated cluster IP has failed while the ownership was all on the restarted
node.
I find it curious that the cluster administrator would be unresponsive on the node that was not restarted as it did a failover smoothly just 30 min ago.
Thanks for your time!

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Windows 2003 Cluster IP Conflict during failover. Possible Spilt Brain Syndrome ?

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