Justin Krejci wrote:
If the private link between the two sites fails, will BGP allow for us to access the IP subnets at site 2 from site 1 via the internet given that both sites are advertising under the same ASN?
No, because your router at site 2 will not accept any prefix with its own AS in the AS_PATH (which site 1 would be advertising from).
Is this a case where having multiple ASNs makes sense to treat each site as remote peers to each other?
Unless someone else has any better advice (I'm sure they do), you will need two separate public ASNs. Site 1 advertises it's space out of AS1, and site 2 advertises it's space from AS2. If you do that, it may be best if you have an eBGP session between the two PoPs using med/pref to ensure the direct link is preferred if it is up. (I've never had to do iBGP between two sites like this before, but I do know that eBGP is preferred over iBGP). Steve