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

[Brian Meade (brmeade)]

Lelio,

So the phones will still get an ITL file in a “Prepare Cluster for Rollback” scenario but it should be a blank ITL allowing the phones to trust everything.  If you open the trust list on the phone, you should see there are no TFTP servers defined in that scenario.

That explains the first thing you saw.

For the 2nd issue, it sounds like your offline cluster possibly was still serving out the blank ITL.  Restarting TFTP service may help there.  You’d need to check the trust list on the phones and actually see  what the phones got in that scenario.

Thanks,
Brian

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Lelio Fulgenzi
Sent: Wednesday, February 19, 2014 4:38 PM
To: cisco-voip voyp list
Subject: [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<mailto:lelio at uoguelph.ca>
www.uoguelph.ca/ccs<http://www.uoguelph.ca/ccs>
Room 037, Animal Science and Nutrition Building
Guelph, Ontario, N1G 2W1

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