[cisco-voip] Changing DNS entries in Call Manager 8.6.2

[Daniel Pagan]

Quick correction - I should have said "the primary DNS server assignment" and not simply "DNS assignments", which after reading my message a 2nd time might imply that any DNS entry change would regenerate a new license MAC.

Hope this helps.

- Dan

From: Daniel Pagan
Sent: Monday, January 26, 2015 6:01 PM
To: 'Gyrion, Larry'; Cisco-voip (cisco-voip at puck.nether.net)
Subject: RE: Changing DNS entries in Call Manager 8.6.2

The DNS assignments make up part of the hash used to generate the license MAC address in UCM 8.x. If you need to  update the DNS entries, my recommendation would be to simply:


1.       Document the current license MAC address. Would also be helpful to to have your Cisco TAC support contract number (if needed).

2.       Update the DNS entries

3.       Document the new license MAC address

4.       Open a TAC case to request for a new license based on the new license MAC. Provide them with the old and new MAC addresses.

Useful Link - describes the license MAC in CUCM 8.x
https://supportforums.cisco.com/discussion/11634991/cucm-86-license-mac-changes-when-modifying-ntp-server

Changing any of these (DNS, NTP, IP Address, etc.) on a UCM 8.x Publisher will require installing a new license, but getting this done and license updated is a pretty simple and straight forward task assuming you have the right info handy for TAC. Worst case, if you have issues getting a new license file would be to revert back to your previous DNS entries - putting it back to previous configurations (assuming nothing else was changed) will generate your old license MAC address, validating the license file that was just previously invalidated. This entire process changed in CUCM 9.x and higher using Cisco ELM/PLM.

- Dan

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Gyrion, Larry
Sent: Monday, January 26, 2015 5:39 PM
To: Cisco-voip (cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>)
Subject: [cisco-voip] Changing DNS entries in Call Manager 8.6.2

Looking for some guidance on updating the DNS entries on our CUCM cluster.  A colleague went through the process, but upon entering the command received a warning stating that the change would invalidate our licenses.  Has anybody come across this before, and if so, what was the proper course of action to ensure license preservation?
CUCM 8.6.2


Thank you,
Larry Gyrion | Telecommunications Analyst | Information Technology
Dean Clinic - Corporate offices
1800 W. Beltline Hwy
Madison WI. 53713
Phone 608.294.6201 | 5406201| Fax 608.280.6852
larry.gyrion at deancare.com<mailto:larry.gyrion at deancare.com> | www.deancare.com<http://www.deancare.com/>
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