So I have 3 datacenters that are all connected by a L2 Gig network. Each location has it's own subnets and needs to access resources at the other locations. Easy enough. Problem is that if the L2 wan is down, the sites can't talk to each other, so i want to setup OSPF to fail over to a GRE tunnel that exists on a separate gateway device at each location. The routers are actually linux Quagga. Currently they are all static routed to each other and it's fine. But if I switch to ospf then does each logical location get it's own area, in addition to the backbone being area 0. Should ospf be able to handle switching the routing from the wan to the tunnel or am I making this harder than it really is..
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