We are planing to do a 4 server CUCM upgrade (physical to VM) from ver 7.1.5 to ver 10. Below is the plan
- Upgrade the CUCM on current MCS servers to ver 9 (bridge upgrade) and take a DRS backup
- Install CUCM ver 9 on VM and perform the backup restoration
- Then upgrade to CUCM ver 10
I have one question on this. After I have done the bridge-upgrade on current MCS servers is it still possible to switch-version the CUCM and get CUCM back to ver 7.1.5?
Hello, Cisco Kbsl.
Upgrading to CUCM ver 9 before 10 is indeed the right path. However, may I know what specific reason you need to downgrade back to 7.1.5? Is this for your own company's CUCM or for a client as well?
Let me know if you have additional concerns or e-mail (firstname.lastname@example.org) me directly. Kind regards.
Thanks for your kind response
This is for our client. Reason is to minimize the downtime. What I planned is, upgrade CUCM to 9 (bridge upgrade) and take the DRS backup the revert back the system to 7.1 and put it in production
When you initiate the upgrade, you can indicate to activate the partition with the new upgrade software or return to using the partition with the previous version of the software at upgrade completion. With the exception of HP 7825H3 and HP7828H3 hardware upgrades, the previous software remains in the inactive partition until the next upgrade. Your configuration information migrates automatically to the upgraded version in the active partition.
Thanks for information
So with our hardware MCS7835I2 we will be able switch back to CUCM 7.1.5 and put the server in production?
I recommend doing the upgrade through PCD where the physical servers keep running the old version, check out the link below: