Stretched Firewalls across Layer-3 DCI? Will the Madness Ever Stop?

I got this question from one of my readers (and based on these comments he’s not the only one facing this challenge):

I was wondering if you can do a blog post on Cisco's new ASA 5585-X clustering. My company recently purchased a few of these with the intent to run their cross data center active/active firewalls but found out we cannot do this without OTV or a layer 2 DCI.

A while ago I expressed my opinion about these ideas, but it seems some people still don’t get it. However, a picture is worth a thousand words, so maybe this will work:

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