We recently had a network event where a card in our core switch would not lock OSPF neighbors. I ended up rebooting this card and was able to restore services. However, I am confused why the network didn't alter the default route in the rest of our routers to redirect traffic. I have attached a simple diagram, red routers are ospf and green routers include BGP. My problem was the link between the green routers and when I tried to get traffic in a peer on the north side(north is up, right?!?) destined for a customer attached via BGP on the south peer, it goes from green to the red just north of it, once it got there, it didn't have a route in it's table for that southern peer, it only has the default route.
So...should it recalculate the default route or should I see a route in the routing table on that first hop away from the green so it doesn't use the default route. The default route is viable so I'm not sure that truly needs recalculated. I do have the following commands on the south BGP router:
enable ospf export e-bgp ExportToBGP
enable ospf export i-bgp ExportToBGP
that policy just states that all networks are accepted: