[cisco-voip] CUCM 10.5.1 to 10.5.2SU4a confusion.

[Mike O]

I'm a little confused on the release notes. Is this considered an L2 upgrade or a refresh?  I took a snippet from the notes:

Refresh Upgrades to Cisco Unified Communications Manager Release 10.5(2)SU2+
Currently, the Upgrade Guide for Cisco Unified Communications Manager and IM and Presence Service instructs administrators performing a refresh upgrade of Cisco Unified Communications Manager nodes that they must both upgrade and switch versions on the publisher node before they begin to upgrade subscriber nodes.
As of Cisco Unified Communications Manager Release 10.5(2)SU2 and higher, administrators have the option of holding off switching versions until after all cluster nodes are upgraded. For this case, the revised order would be:

  1.  Upgrade the Unified Communications Manager publisher node.
  2.  Upgrade the Unified Communications Manager subscriber nodes.
  3.  Switch the publisher node to the upgraded partition.
  4.  Switch the subscriber nodes to the upgraded partition.
Note

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You can switch the subscriber nodes to the upgraded partition either all at once, or one at a time, depending on your site requirements.
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For Cisco Unified Communications Manager Release 10.5(2)SU2 and higher, administrators can apply this optional version switching sequence to the Refresh Upgrade task lists in the "Upgrades Overview" chapter of the Upgrade Guide for Cisco Unified Communications Manager and IM and Presence Service.


Thanks,

Mike
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