I am in the midst of a UC 6.1 upgrade that has been a bit of a challenge. However, I was asked by the customer today to make an additional change that I am a little stumped about:
They have an existing CallManager 3.3.3 2-server cluster, which is NOW CallManager 4.1.3, after a couple of nights of upgrading to a version compatible with the DMA tool and running the DMA to get a clean backup TAR.
Now, here is the problem:
I have the existing CCMs with PUBLIC IP addressing (yeah, that's right!........DON'T ASK!) and, as you can imagine, the customer is changing to a Private LAN 10.X.X.X subnet on the new UC boxes. However, my dilemma is that the DMA migration REQUIRES that you to the restore onto a new server with the SAME IP address (if I am not mistaken........feedback on this one?) So, my thought is to change the IP address on the EXISTING 4.1 servers and, then re-run DMA, and do a restore to the ALREADY-BUILT UC boxes with the NEW IP addresses.
Do I change the new UC boxes to the EXISTING IP addresses of the production servers (they're in a "lab" BTW.....) and use the EXISTING DMA TAR file, ...............THEN change the IP addresses BACK?
I guess I could do it either way, but I want to minimize outage time, while, at the same time, assuring the possibility of getting a GOOD DMA TAR file without re-running it a THOUSAND TIMES!
Re: changing IP address on CallManager 4.1 VS. UC 6.1
you're right in the fact that DMA gets the ip address, but during the upgrade phase you can change the hostname and ip address, a routine will take care of changing the necessary entries when taking the info from the DMA
System Installation and Upgrade for IP Telephony - PDF
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