I'm currently in the planning process to upgrade from CUCM 7.1(5a) on MCS server to CUCM 8.6(2a) on UCS C-Series via the "Bridge Upgrade" method whilst retaining current IP addr for all the CUCM nodes in the cluster.
As I understood it, the normal bridge upgrade path would be to:
- Install CUCM 8.6(2a) on the inactive partition on the current MCS hardware,
- Bring up the current CUCM cluster on 8.6(2a) and perform DRS backup
- Build UCS C-Series and install CUCM 8.6(2a) on the new CUCM cluster
- Perform DRS restore on the new cluster.
However I'd like to know if the following process is supported by Cisco?
As Gordon states it is not officially supported, but the reality is the MCS server may not support version 8.0, I personally have done couple of such upgrades successfully, and have not run into any issues.
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