[cisco-voip] unexpected behaviour with "Prepare Cluster for Rollback" and migrating phones between v9 and v7 cluster

[Bernhard Czapp]

Hello Lelio,

find more information here:
https://supportforums.cisco.com/docs/DOC-15799#Rollback_Enterprise_Parameter

"Prepare Cluster for Rollback to pre-8.0"
does not delete the ITL, instead it installs ITL to trust any device.

Best regards,
Bernhard


----- Ursprüngliche Mail -----
> Von: "Lelio Fulgenzi" <lelio at uoguelph.ca>
> An: "cisco-voip voyp list" <cisco-voip at puck.nether.net>
> Gesendet: Mittwoch, 19. Februar 2014 22:37:35
> Betreff: [cisco-voip] unexpected behaviour with "Prepare Cluster for Rollback" and migrating phones between v9 and v7
> cluster
> 
> 
> OK, now I am officially confused. ;)
> 
> I was under the impression that once a phone has registered to a v9 cluster,
> it downloads an ITL trust list/file which prevents it from registering to a
> v7 cluster. To help with this, the "Prepare Cluster for Rollback" enterprise
> parameter was introduced.
> 
> Here's what I did:
> 
>     * upgraded offline cluster (all servers had same hostname and IP address)
>     * set the "Prepare Cluster for Rollback" parameter to True and clicked
>     Save (because there were no phones registered, I did not "Apply
>     Changes")
>     * plugged phones into the offline network
>     * phones registered to the new offline v9 cluster
>     * checked phone security pages - they showed ITL files listed (that long
>     string of numbers)
>     * thinking it was the "Apply Changes" that missed something, I clicked
>     that
>     * phones restarted, but still showed an ITL file
>     * brought a phone back to the live network, phone registered to the v7
>     cluster (still has an ITL file listed)
>     * on offline cluster, change the "Prepare Cluster for Rollback" to False,
>     clicked Save, clicked Apply Changes (phones restarted, and showed an ITL
>     file)
>     * I picked up one of the phones from the offline network (now in
>     rollback=false mode) and brought it to the live network. It registered
>     to the v7 cluster.
> 
> 
> 
> So what I see are a few things confusing me:
> 
>     * Why do phones still have ITL files if the cluster is in rollback mode.
>     This is not a big deal, but I'd like to be able to tell from the phone
>     when it's registered with the "Prepare Cluster for Rollback" set to
>     TRUE.
>     * Why does a phone that registers to a v7 cluster still have it's ITL
>     file set?
>     * Why (and this is the one that gets me) does a phone that was on v9 with
>     "Prepare Cluster for Rollback" set to FALSE successfully register to the
>     v7 cluster?
> 
> 
> 
> Is the ITL trust list a simple hash of the IP addresses and host names of the
> cluster members? If I don't change anything, things will continue to work?
> 
> 
> 
> 
> Is something wrong with my logic and steps? I was testing with a 7942 and a
> 7962.
> 
> 
> 
> 
> 
> Lelio
> 
> 
> ---
> Lelio Fulgenzi, B.A.
> Senior Analyst, Network Infrastructure
> Computing and Communications Services (CCS)
> University of Guelph
> 
> 519‐824‐4120 Ext 56354
> lelio at uoguelph.ca
> www.uoguelph.ca/ccs
> Room 037, Animal Science and Nutrition Building
> Guelph, Ontario, N1G 2W1
> 
> 
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