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" <le...@uoguelph.ca> > An: "cisco-voip voyp list" <cisco-voip@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 > le...@uoguelph.ca > www.uoguelph.ca/ccs > Room 037, Animal Science and Nutrition Building > Guelph, Ontario, N1G 2W1 > > > _______________________________________________ > cisco-voip mailing list > cisco-voip@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-voip > _______________________________________________ cisco-voip mailing list cisco-voip@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-voip