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

[Lelio Fulgenzi]

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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