I'm currently running OSPF on my WAN 3700 router in which I have GRE tunnels created between multiple branch offices. I'm also tunning OSPF on my inside core switch within each branch office. My interbusiness design is IPSEC/GRE mesh.
Now, I am in the process of deploying MPLS and I want to keep the OSPF mesh in tact to serve as my backup conduit to branch office if the remote office would fail..
Logic, send default traffic to MPLS router;
if no route, send to GRE router because traffic is either internet destined or remote location is down.
now, I want to disable OSPF on my LAN at all brance office but I need the GRE router that is connected to the core LAN switch to advertise the multiple LAN routes on the inside network. If I leave OSPF on the LAN switch configured, routing won't occur as I need it to happen. I need the MPLS router to e the single route decision maker.