Clustering on a Call Manager

Unanswered Question
Mar 17th, 2009


A customer has already a CM ver 6, he needs to install an additional CM to form a cluster, can you please help me with the configuration procedure? do i need another licence for the existing publisher server?

Thanks in advance for your help

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rob.huffman Tue, 03/17/2009 - 07:34

Hi Georges,

You will need to acquire a new "node" license before adding the new Subscriber :)

The steps for adding a subsequent node (subscriber) are listed nicely in this doc;

Configuring a Subsequent Node

To configure a subsequent node in the cluster, follow these steps.


Caution You must configure a subsequent node on the first node by using Cisco Unified Communications Manager Administration before you install the subsequent node. For more information, see the Cisco Unified Communications Manager Administration Guide.




Step 1 If you configured Network Time Protocol on the first node, ensure that it is synchronized with an NTP server before you install a subsequent node. From the Command Line Interface on the first node, enter utils ntp status. Ensure that the output indicates that the node is synchronized with an NTP server.


Note If the first node is not synchronized with an NTP server, installation of the subsequent node will fail.


Step 2 On the First Node Configuration window, read the Warning and make sure you have correctly configured the first node. To continue with the installation of the subsequent node, click OK.

The Network Connectivity Test Configuration window displays.

Step 3 During installation of a subsequent node, the system checks to ensure that the subsequent node can connect to the first node.

•To pause the installation after the system successfully verifies network connectivity, choose Yes.

•To continue the installation with a pause, choose No.

The First Node Access Configuration window displays.

Step 4 Enter the first node connectivity information and choose OK.

The system checks for network connectivity.

If you chose to pause the system after the system successfully verifies network connectivity, the Successful Connection to First Node window displays. Choose Continue.


Note If the network connectivity test fails, the system always stops and allows you to go back and reenter the parameter information.


The SMTP Host Configuration window displays.

Step 5 If you want to configure an SMTP server, choose Yes and enter the SMTP server name.


Note To use certain operating system features, you must configure an SMTP server; however, you can also configure an SMTP server later by using the operating system GUI or the command line interface.


The Platform Configuration Confirmation window displays.

Step 6 To start installing the software, choose OK, or, if you want to change the configuration, choose Back.

Step 7 When the installation process completes, you get prompted to log in by using the Administrator account and password.

Step 8 Complete the post-installation tasks that are listed in the "Post-Installation Tasks" section.

Hope this helps!


mazen.mardini Wed, 03/18/2009 - 02:21

Hello Rob,

Do we need to purchase anything to acquire the new "node" license.

Note that the server installed is MCS7816.

Thanks in advance


mazen.mardini Fri, 03/20/2009 - 00:51

Hello Rob,

Could you please advice if there are any additional licenses to be purchased other than the seats on the new MCS?

Thanks in advance.



rob.huffman Fri, 03/20/2009 - 05:32

Hi Mazen,

Sorry man, I didn't see your first post :)

Here is a clip from a CCM Ordering Guide

"A license must be ordered for each server in a Unified Communications Manager cluster irrespective of server function (e.g. MOH, TFTP, warm standby server, etc). **This would be the "node" license.

We know that the CCM Cluster "must" have the appropriate Node Licenses/with seats to operate correctly. In your case a "new" Node License will be required to add support for the additional Subscriber box.

It would look something like this;

1x LIC-CM6.0-7816=xxxx

Where xxxx is equal to the number of seats that are required.

Hope this helps!



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