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Cisco UCCE TR upgrade on same domain

We are upgrading UCCE from 8.5 to 10.5 on new hardware, hence its a technology refresh upgrade

the servers will have new IPs and hostnames

 

We only have a single AD and wish to do the deployment on it. During the upgrade, both 8.5 and 10.5 system will be running at the same time

 

As per Cisco upgrade guide, a new AD is required for a TR upgrade, but this wont be possible in our scenario

 

How can this be handled? instance name has to remain the same to use the EDMT tool

 

Can we use the same facility and instance currently being used?

Or is it safer to create a new facility and then create an instance with the same name under it?

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