On Tue, Jul 16, 2013 at 9:35 AM, Brian Kantor Brian@ucsd.edu wrote: everyone else who is doing multiple peering points has independent
connectivity between those points
In our case, we already have that with the tunnels, so I can totally see this working.
As mentioned before, we would need a new AS number from ARIN. We would also need to designate a small chunk of the 44 space for anycasting on the internet. Every BGP gateway router would send announcements for 44/8 using the new ASN. Each router will also listen on the same anycast IP for tunnel traffic (such as 44.255.255.1). When IPIP packets are received on that address, it will route them using the tunnel matrix. The subnet routers (the ones not using BGP) would need a static route that sends the anycast IP range out through their internet connection instead of through the tunnel.
The advantage of this configuration would not only be redundancy, but anycasting also allows the traffic to automatically route to it's closest gateway. This is what many CDNs and DNS providers do.