We have two geographically distinct locations that currently both fall under the same ASN.
At site 1 we have a particular set of ip networks (/20 and bigger) in use only locally to this site At site 2 we have a separate set of ip networks (/20 and bigger) in use only locally to this site Each site has at least one upstream internet connection advertising with BGP. There is also a (reliable) private link between to the two sites where our routers at each site are all talking iBGP (as well as ospf). There is a router subnet (/27) that spans the two sites. We currently advertise all subnets out all upstream connections as if both sites were only one and traffic routes between sites without issue via the private link. 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? Is this a case where having multiple ASNs makes sense to treat each site as remote peers to each other? Thanks, Justin