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

[Lelio Fulgenzi]

As a follow up to this, I'm still a little confused. 

I have confirmed 

    * that the phone that I removed after setting the "Prepare Cluster for Rollback" to True, had an empty trust list 
    * that the phone that I removed after setting the "Prepare Cluster for Rollback" to False, had an non-empty trust list 


        * TFTP: fqdn of TFTP server 
        * TVS: fqdn of PUB 
        * TVS: fqdn of SUB1 
    * 
this was with only changing the parameter and resetting phones, no restarts of TFTP or TVS services. 

I was also able to confirm that: 

    * both the phone with an empty trust list AND non-empty trust list were able to register to the old cluster 
    * I was able to change the configuration (adding a secondary DN) to both phones and they both accepted them 



Is the trust list simply a _list_ of acceptable hosts? And because the (fqdn) hostnames and IP addresses are the same on both clusters the phones are still able to register and accept changes? 


If not simply a list, and it uses the host certificates, i.e. it uses host certificates to either build the list hash or push the certificates down to the phones, is what I am seeing the same certificate being generated on each host? I mean, I'm using all the same information, could that be possible? I don't know which certificates to compare, or I would have provided the results of that test. 


Thoughts? 


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 

----- Original Message -----

From: "Lelio Fulgenzi" <lelio at uoguelph.ca> 
To: "cisco-voip voyp list" <cisco-voip at puck.nether.net> 
Sent: Wednesday, February 19, 2014 4:37:35 PM 
Subject: 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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