Ensure the Cisco Unified Communication Manager server with the publisher database is configured as the first node and Cisco Unified Communication Manager servers with subscriber databases are configured as subsequent nodes. Review the following sections carefully before you perform the upgrade:
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Installation Information Worksheet
•Handling Network Errors During Installation
•Checklist for Upgrading the First Cisco Unified CM Node
•Navigating Within the Installation Wizard
•Selecting an Installation Option
•Installing the New OS and Application on the First Node
•Checklist for Upgrading Subsequent Nodes in the Cluster