<div dir="ltr">That's what I would do. Sometimes new versions have issues with restored certs so may be worth doing the rollback method and not completely relying on DRS.<div><br></div><div>If you have 2 clusters with different IPs and both online at the same time, definitely a better idea to use the Bulk Certificate Export/Consolidate/Import method.</div><div><br></div><div><a href="https://supportforums.cisco.com/t5/collaboration-voice-and-video/migrating-ip-phones-between-clusters-with-cucm-8-and-itl-files/ta-p/3108501">https://supportforums.cisco.com/t5/collaboration-voice-and-video/migrating-ip-phones-between-clusters-with-cucm-8-and-itl-files/ta-p/3108501</a><br></div><div><br></div><div>Also keep in mind, post 11.5(1)SU3? I believe they started signing the ITL with the recovery key instead which may not restore the same, haven't tried restoring the ITL recovery key yet.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 28, 2018 at 12:16 PM, Anthony Holloway <span dir="ltr"><<a href="mailto:avholloway+cisco-voip@gmail.com" target="_blank">avholloway+cisco-voip@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Your first step is incorrect. You need to restart TFTP and TVS first, then reset phones.<div><br></div><div>Now, the scenario you described, you wouldn't even need this, would you? Because your servers and more importantly, certificates, are staying the same, you're just upgrading the application. Unless of course you were planning on regenerating certs before moving phones over, but you didn't say that, and you might as well just wait until the phones are moved, then regenerating certs is actually easy, and doesn't require special considerations like cert combo and rollback. You just regen one server at a time, resetting the phones so they learn about the new server identity, while still trusting one or more servers in the cluster. <br></div><div><br></div><div>But, yes, this is the main go to method for me when migrating phones from one cluster to another (not hardware). Keep in mind, that if the old cluster is staying around, and phones need to move between them, then sharing/combining certs would be the answer.</div><div><br></div><div>I think I said everything correct... Brian Meade seems to be the Chief Security Office around these parts, so let's see what he says.</div><div><br></div></div><br><div class="gmail_quote"><div><div class="h5"><div dir="ltr">On Wed, Feb 28, 2018 at 10:58 AM Lelio Fulgenzi <<a href="mailto:lelio@uoguelph.ca" target="_blank">lelio@uoguelph.ca</a>> wrote:<br></div></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><br>
In the past, we used this parameter to prepare phones to be homed to a different set of hardware.<br>
<br>
For example:<br>
<br>
<br>
* Set parameter to true, reset phones.<br>
* In an offline network, restore from DRS and upgrade servers<br>
* During a maintenance window, turn off version A servers and turn on version B servers<br>
* Wait for TFTP timeout/reset for phones to begin talking with new TFTP server<br>
* Once all phones are registered, set parameter to false, reset phones<br>
<br>
Just wondering if this is still the way to get phones registered to different cluster hardware.<br>
<br>
Lelio<br>
<br>
<br>
---<br>
Lelio Fulgenzi, B.A. | Senior Analyst<br>
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