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What cluster peer intercluster networking is
A cluster peer relationship, that is, two different clusters communicating with each other, requires an intercluster network on which the communication occurs. An intercluster network consists of intercluster logical interfaces (LIFs) that are assigned to network ports.
The intercluster network on which replication occurs between two different clusters is defined when the intercluster LIFs are created. Replication between two clusters can occur on the intercluster network only; this is true regardless of whether the intercluster network is on the same subnet as a data network in the same cluster.
The IP addresses assigned to intercluster LIFs can reside in the same subnet as data LIFs or in a different subnet. When an intercluster LIF is created, an intercluster routing group is automatically created on that node too. A gateway address for the intercluster routing group must be defined and the intercluster routing group must be routed to the defined gateway address.
Intercluster LIFs can be assigned to ports that have the role of data, which are the same ports used for CIFS or NFS access, or intercluster LIFs can be assigned to dedicated ports that have the role of intercluster. Each method has its advantages and disadvantages.

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