Question

You are planning a standard (L2) upgrade of a Cisco Unified Communications Manager cluster consisting of one publisher, two call-processing subscribers, and one dedicated TFTP subscriber. To minimize risk and follow Cisco's recommended cluster upgrade sequence, in what order should the nodes have the new software installed to the inactive partition?

Accepted Answer

Install on the publisher first, then the subscriber nodes (including the TFTP subscriber), all before switching any node to the new version

Answer

Install and switch versions on each subscriber individually, then finish with the publisher last

Answer

Switch the publisher to the new version immediately after its install, then begin installing the subscribers one at a time

Answer

Install on the TFTP subscriber first so phones receive new configuration files before any other node is upgraded