I don't think you need to configure this on Rls 5.0. The cores are connected through the HSP port and as long as you have package 410 you should be good to go. The cores will work much like the dual cores in the Option series PBXs in a constant active/active state. If one fails, the other automatically takes over.
The node address and other VoIP settings should all be the same, unless you have more than one signaling server with different node addresses.