.. _cup_cluster_migration:

CUP Cluster Migration
---------------------

IM and Presence Service (previously known as CUP) was set up in a cluster
separate from the Cisco Unified Communications Manager cluster. This configuration
is called a multicluster configuration. However, the IM and Presence Service
servers are set up as part of the Unified CM cluster itself, in what is called a
single-cluster configuration. The single-cluster configuration correctly
represents the Unified CM cluster with its IM and Presence Service servers in the
management layer. This configuration eliminates the confusion that multicluster
configurations can cause for administrators when Cisco Prime Collaboration
Assurance and other tools show these servers in different clusters.

Multi-Cluster vs. Single Cluster Configuration

|multi-cluster-config|

Although the use of multicluster configurations is deprecated and highly
discouraged, VOSS-4-UC continues to support multicluster configurations for
backward compatibility and upgrades. Service providers are encouraged to use the
single-cluster configuration for new clusters. Convert existing multicluster
configurations to single-cluster using the migration tool under Device Management.

.. |multi-cluster-config| image:: /src/images/multi-cluster-config.png