Thinking about the process to upgrade CM 4.2 to 8.0.2c

[alalli]

Good Day All,

I have a CM 4.2 (publisher and subscriber) that I need to upgrade to CUCM version 8.

I am trying to get my head around the best process to follow.

Prework-  doublecheck the physical hardware will support 8.0.2c.

7835-H2 with 2Gig RAM and 72G hard disk (done)

1.  Get everything ready to rebuild CM4.2 if necessary

          check the backups

          recovery/installation disks

2.  Use the DMA tool

     Correct any problems or errors before proceeding.

3.  The devices on the network are registered t the subscriber.

     Shutdown subscriber (small outage window) and make sure the devices register with the CM 4.2 publisher.

4.  Build a new publisher on test network to 7.1(2)

     The new Publisher server gets the IP address of the current publisher

     Choosing this particular version because I found a Cisco guide for upgrading 4.2(3) to 7.1(2)

5.   Migrate the data

6.   Check that phones will regiter to new CM 7.2(2) publisher.

7.   Upgrade to 8.0.2 and recheck test phones.

8.  Plan an outage window to shutdown CM4.2 Publisher and introduce CUCM8.0.2c publisher

9  If all goes well, build a new subscriber

This will be the first time I am responsible for an upgrade between Windows based CM to Linux Based so it would be really great to hear from people who have done this before.

I am most interested in knowing if my plan is basically solid and what are the 'gotchas' that I need to look out for.

Thanks very much for any assistance.

Regards,

Amanda

[Rob Huffman · Accepted solution]

Hi Amanda,

I'm sure some others will weigh in here

This looks like a good plan and it's great to see that you

are doing the requisite "due diligence" before moving forward.

Two small notes that I see;

# 5 - Migrate data will really be part of # 4 as the data produced

from the DMA migration tool will be inserted during the Publisher build

when the step asks if this is a Windows upgrade.(YES)

Don't forget about the phones. When you upgrade to a newer version of CUCM the phones will upgrade
to the Firmware version listed in the doc I have linked below. The way to mitigate all this
additional overhead during the upgrade window is to upgrade the phones ahead
of time. Be careful with these newest firmware versions, you will need to go to 8.5.2
prior to any 8.5.3 & 9.0 version.

Check out Table 19

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/compat/ccmcompmatr.html#wp43813

Cheers!

Rob