[cisco-voip] Migrating IP space

[Ben Amick]

V9.1.2, yeah, just IP change, along with DNS and NTP change as well because we were migrating entire IP scopes, but no hostname or cluster changes, no.

Ben Amick
Telecom Analyst

From: Ryan Huff [mailto:ryanhuff at outlook.com]
Sent: Sunday, April 30, 2017 7:04 AM
To: Gary Bates_Command Solutions <gbates at commandsolutions.com.au>
Cc: Ben Amick <bamick at HumanArc.com>; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Migrating IP space

Ben,

The "Prepare Cluster for Rollback to Pre 8.0" parameter in part, is used to empty out the ITL and CTL files on each phone (the process to do that involves more than just setting that parameter though).

As I recall, you enable the parameter, bounce TVS on each server to clear out all entries in the ITL/CTL files of each phone in TFTP, then bounce TFTP on all nodes to refresh the cache list; lastly, reboot all phones to trigger an ITL/CTL download from TFTP. You would check a the phones and ITL/CTL should be empty.

This allows the phone to "blindly" trust new ITL/CTL connections without verification. This is what you typically did when moving SBD phones between clusters when the certs were different.

Now why an IP change ONLY caused that, I'm not sure specifically without seeming the files per-change compared to post-change.  Other than to say given the way ITL/CTL works; it suggests something changed with how the ITL/CTL files on TFTP were signed and when the phones downloaded them after the change, they couldn't verify ("trust") them with what they already had.

All you changed was the IP address of CUCM correct, nothing else? What version of CUCM?

Thanks,

Ryan


On Apr 30, 2017, at 6:20 AM, Gary Bates_Command Solutions <gbates at commandsolutions.com.au<mailto:gbates at commandsolutions.com.au>> wrote:
Very odd bug fix
I not encountered this before,

I thout the idea of named hostnames for the server wod alleviate the need for any IP address dependency

Did it resolve the phone connection bug ?

Gary

Sent from my iPhone

On 30 Apr 2017, at 3:19 pm, Ben Amick <bamick at HumanArc.com<mailto:bamick at HumanArc.com>> wrote:
So I was performing an IP migration of systems tonight, and ran into an issue where the ITL files on every system refused to connect to the new IPs, despite the fact that the ITLs were based on the hostname of the systems. I was instructed by TAC afterwards while trying to fix it that the proper method, regardless of version change or not, if changing any attributes of the CM, is to enable the enterprise parameter of something along the lines of “Prepare for rollback for pre 8.0 migration”

Anyone else familiar with this procedure? I find that to be a strange name for something that needs to be turned on for so many different pieces of work.

Ben Amick
Telecom Analyst


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