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

[Lelio Fulgenzi]

More good info. This list rocks. 

Sent from my iPhone

On 2014-02-19, at 5:28 PM, Bernhard Czapp <bc at bsw-com.de> wrote:

> 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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> 
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