/mcpNote Do not use single quotes (' ') in the Description field while adding the node details. d) Optional. If you are deploying IPv6, enter an IPv6 Address. e) Click Save. f) Repeat these steps for each subscriber node that you want to add. Step 4 (IM and Presence Service only) Add your Presence Redundancy Groups in order to define your subclusters. a) From Cisco Unified CM Administration, choose System > Presence Redundancy Groups. b) Click Add New. c) Enter a Name and Description for the group. d) From the Server drop-down list, choose the IM and Presence Service nodes that you want to add to this group. e) Click Save. f) Repeat this procedure until you've created your groups. You can have up to three Presence Redundancy Groups in a cluster, with each group consisting of two IM and Presence Service nodes. What to do next Install Subscriber Nodes Install Subscriber Nodes Use this procedure if you want to install subscriber nodes for Unified Communications Manager or the IM and Presence Service. Before you begin Before you install software for either Unified Communications Manager or IM and Presence Service subscriber nodes, you must add the node to the Cisco Unified Communications Manager publisher node. For details, Add Subscriber Nodes, on page 58. Procedure Step 1 If you have configured Network Time Protocol on the publisher node, ensure that it is synchronized with an NTP server before you install a subscriber node. From the Command Line Interface on the publisher node, enter utils ntp status. Ensure that the output indicates that the node is synchronized with an NTP server. Note If the publisher node is not synchronized with an NTP server, installation of the subscriber node will fail. Step 2 On the First Node Configuration window, read the Warning and make sure that you have correctly configured the first node as the publisher node. To continue with the installation of the subscriber node, click OK. The Network Connectivity Test Configuration window displays. Step 3 During installation of a subscriber node, the system checks to ensure that the subscriber node can connect to the publisher node. Installation Guide for Cisco Unified Communications Manager and the IM and Presence Service, Release 15 and SUs 59 Installation Methods Install Subscriber Nodes