Clusters communicate with each other through logical interfaces (LIFs) that are dedicated to intercluster communication. You must create an intercluster LIF within each IPspace that will be used for peering, on each node in each cluster for which you want to create a peer relationship.
You must have identified the subnet and ports, and optionally the IP addresses, that you plan to use for the intercluster LIFs.
All of the nodes in each cluster have intercluster LIFs that can all communicate with each other.