Lately I have had to change the network parameters for a CUCM cluster, this is not a day-to-day task, because of that I going to show you how to change it to avoid any major issue.
As a network parameter, it should be done during a time window out of business hours. As you would do with any other operation, verify the proper operation of the CUCM cluster before make any change, make a backup and have a rollback plan to use in case that something goes wrong.
You will find a guide from Cisco which is a good point to start and covers all the process but I like to have always my own documentation in addition to other, to have my own notes. It helps me to remember important details and issues that I have had, the purpose is to have the whole experience write down.
Let’s start the task, it is very important to follow this order to avoid any error. You will have to request a new license file re-issued by Cisco to use it after the change. Start making all the changes on the publisher and after that with the subscribers.