I am looking at placing a Cisco ASR1001 Router at the edge of my network. I currently have a Cisco ASA 5510 that I'll be replacing with a 5545X. My ISP is currently connected to the outside interface of my ASA and I have a backup ISP off another interface but as you know the ASA is pretty limited when it comes to true routing. I plan on terminating the ISPs at the Cisco ASR for ISP failover but would like to keep all the natting on the firewall (ASA).
What configuration would be needed on the ASR to accomplish this - what network would I need to put the outside interface on that will be connected to the ASR? Is this what you would recommend as far as design goes?
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