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So long as your 2013 is under Subscription, no. Your Subscription network license will allow for previous versions up to three releases back. All you will need to do is install 2011 as a network version and point to the license server. Nothing special beyond that.
Thanks, so this would continue to work until 2015 is released, I'm assuming.
Yes, it will work as far up as your Subscription 2015 license. However if at the time you choose to upgrade to 2016, then you would not be able to use 2011 anymore. However, nothing keeps you from continuing to use 2011 so long as you do not choose to update to 2016, even if your Subscription automatically updates you. You can get 2016 and not choose to license it and continue to use 2011 indefinitely until you deem it necessary to move on.
Thanks
Here is an unrelated question but I guess I can hijack my own thread
What exactly happens if you lose network connection and you are not borrowing? Can you reconnect and resume using AutoCAD? Can you save and exit?
If AutoCAD loses its heartbeat connection to the NLM, it will try to reconnect on its own. If it cannot, and the license is not borrowed, it will notify you and will ask you to save before it closes. You will not lose any work. If the network connection is restored, then it will be like nothing ever happened. There's not much to worry about in terms of network licensing. There are rarely connectivity issues once everything has been set up properly.