[cisco-voip] Prepare Cluster for Rollback to pre 8.0 Parameter - still valid for moving to different hardware?

[Anthony Holloway]

Your first step is incorrect.  You need to restart TFTP and TVS first, then
reset phones.

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.

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.

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.


On Wed, Feb 28, 2018 at 10:58 AM Lelio Fulgenzi <lelio at uoguelph.ca> wrote:

>
> In the past, we used this parameter to prepare phones to be homed to a
> different set of hardware.
>
> For example:
>
>
>   *   Set parameter to true, reset phones.
>   *   In an offline network, restore from DRS and upgrade servers
>   *   During a maintenance window, turn off version A servers and turn on
> version B servers
>   *   Wait for TFTP timeout/reset for phones to begin talking with new
> TFTP server
>   *   Once all phones are registered, set parameter to false, reset phones
>
> Just wondering if this is still the way to get phones registered to
> different cluster hardware.
>
> Lelio
>
>
> ---
> Lelio Fulgenzi, B.A. | Senior Analyst
> Computing and Communications Services | University of Guelph
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