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I've been vocal on this for a month now. A member from the ISE PM team, and another in the BU has already stated that they do not support 2.4 on the 3600's. I'm hoping their minds can be changed as I feel it's short sighted. 2.6 is supported on the 3500's, and the 3600's, but I'm sure not ready to deploy 2.6 in production until it's well vetted and Cisco is recommending it. It took a year before 2.4 became the recommended release, I have a customer that will hold their order and project until 2.6 becomes recommended, or Cisco says it's ok to run 2.4 on the 3600's.
So we need to see, at the end of the day, when Cisco says no, customers won't take the risk. Until someone in the field receives a 3600, and tries to install 2.4 on it we don't even know if it contains the necessary drivers to support them. Only the BU can say at this point. It would be awesome if 2.4 is certified to run on the 3600 platform, not even asking for increased scale, just business as usual.