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Prepare Cluster for Rollback to Pre-8.0

Prepare Cluster for Rollback to Pre-8.0

When migrating IP Phones from clusters from 8.X on wards to 9.X /10.X /11.X versions, you may encounter issue with security files i.e., ITL files (Initial Trust List). which is a new security feature by default. The ITL files needs to be deleted either manually or automatically in order to register to the target Cisco Unified Communications Manager version. If the ITL files are not deleted, the device may fail to register to the new cluster.

There is a feature which was introduced in 8.X version “Prepare Cluster for Rollback to Pre-8.0”. This feature is located in Enterprise Parameters. If you are doing a flash cut-over i.e., migrating all the cluster IP Phones at one go from Legacy Cluster to New Cluster, then this feature is most appropriate and useful. It will help you to register your IP Phones from legacy 8.X Cluster to New Clusters without issues. If you are migrating the IP Phones per site/location basis, this is not a recommended option.

How to deal with this feature if you are migrating all the IP Phones at one go from Legacy Cluster to New Cluster?

Configuration in Legacy CUCM Cluster:

  • Login to Legacy Cluster CUCM >
  • Go to Enterprise Parameters > Prepare Cluster for Rollback to pre 8.0 > Set the parameter to True
  • Now the IP Phones will be rebooted and the dependency of ITL files will be removed
  • IP Phones will re-register to the Old Cluster

    Configuration in Legacy CUCM Cluster and Switch:

  • Login to the New Cluster CUCM >
  • Go to Enterprise Parameters > Prepare Cluster for Rollback to pre 8.0 > Set the parameter to True
  • Change DHCP option 150 and ensure you put the new cluster TFTP IP Address.
  • Reset the IP Phones or Device Pool from the Legacy Cluster

    Monitoring the IP Phones registration :

  • The IP Phones should start registering to the New Cluster. Monitor and ensure that all the IP Phones are registered. You may use RTMT to monitor the IP Phones registration process.
  • On the New Cluster >  Go to Enterprise Parameters > Prepare Cluster for Rollback to pre 8.0 > Set the parameter to False
  • The IP Phones should start re-registering to the New Cluster again. Monitor and ensure that all the IP Phones are registered.

Hope this helps!!

Published by Team UC Collabing

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Electrical Engineer CCNA Collaboration CCNA Voice CCNA R&S. I'm Electrical Engineer and I work like Support Engineer for a Telephony Service Provider Company. Before that I had position like Pre-Sale Engineer about small and medium multivendor telephony solutions. I have 5 years of experience working in Telephony Multivendor Projects. I am also 3 years of experience working in Support and implementation about Cisco Collaboration platforms: UCS server, UCM, Cisco Unity, Presence Server, Jabber, Gateway. Support Community is most useful in finding design, implementation and support tricks and shortcuts that greatly help me in my daily activities. If you need to contact me, please you can writte me.

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