On Tue, Jul 21, 2015 at 11:18 AM, Brian Kantor Brian@ucsd.edu wrote:
Wouldn't that also provide for fail-over redundancy? If the region or home gateway went down - the other would keep traffic flowing.
I believe Tom is speaking of dividing up the address space among several routers, which would require some tricky route advertisement to provide any kind of redundancy. - Brian
Not really tricky... Just advertise the same address space from multiple locations. The users of that address space would then need to set up tunnels to ALL of the locations the address space is advertised from. You could set it up so that the address space was only advertised when the tunnel was operational.
For example, HamWAN advertises 44.24.240/20 from a handful of locations. Each of those locations have tunnels to each other, so no matter what location the inbound traffic comes in on, it is tunneled to the appropriate internal address. If one of these edge routers goes down, the address space stops getting advertised and inbound traffic starts going to the other locations instead. This is a pretty vanilla use of BGP.
Tom KD7LXL