Choosing a Multicast Address

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http://www.tcpipguide.com/free/t_IPMulticastAddressing.htm

http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml

When setting up multiple clusters in the same subnet, changing just the multicast port would work but it will add work on each node that will have to receive the packet and then filter out based on port.

Best practice would be to have a different IP address, and, also to have the IP address as far apart as possible as it would help at the switch level.