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What intercluster LIFs are

The intercluster network uses logical interfaces, or LIFs, that correspond to IP addresses and represent network access points to a node. The intercluster network uses only intercluster LIFs. You assign intercluster LIFs to ports as part of the cluster peer configuration process.

The following are requirements for intercluster LIFs:

Your cluster peering topology should use full-mesh connectivity. Full-mesh connectivity means that all the intercluster LIFs of one peer cluster can communicate with all of the intercluster LIFs of the other peer cluster.

As intercluster LIFs become available or unavailable, the list of active IP addresses used by the cluster can change. The discovery of active IP addresses is automatic in certain events, such as when a node reboots. The creation of a peer relationship requires only one remote cluster address. However, in the event that the node hosting that address is down and the address becomes unavailable, the cluster peer relationship might not be rediscovered. Therefore, it is a best practice to configure at least one intercluster IP address from each node in both clusters, so in the event of a node failure, the peer relationship remains stable.

The port to which you assign an intercluster LIF can be a physical port or a logical port, such as a virtual LAN (VLAN) or an interface group.

Tip: Intercluster LIFs fail over only to other ports capable of intercluster communication on the same node. It is a good idea to use a naming convention that indicates the node on which an intercluster LIF was created, followed by ic# or icl# to indicate the LIF type and number. For example, the second of two intercluster LIFs on the fourth node of cluster01 might be named cluster01-04_ic02. The first letter of a LIF name should be either a letter or an underscore.