![]() ![]() We did NOT choose to auto switch versions. ![]() One thing I wanted to point out is we also had concerns with downtime involved with a refresh upgrade but we structured it such that we avoided it by doing the pub first, then the primary CCM and TFTP servers, then the secondary. Then lots of relatively minor to medium level Finesse issues. So we had to rebuild the cluster using the 12.5 400 Agent OVA, but running 11.6. CCX was one of the most painful because on 11.6, we used the 300 Agent OVA, which isn’t supported in 12.5. We also upgraded CCX from 11.6 ES02 to 12.5 ES02 (ES03 is now out FYI). We did the same, started wit CUC which was relatively painless, then started with the outlying international then to SME and finally to our largest 13 node cluster. Also an SME cluster that’s a hub to international clusters. We’ve recently upgraded a large CUCM cluster (13 node) from 11.5 SU7 to 12.5 SU3.
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