Full mesh OSPF over GRE tunnels in combination with BGP
I have R1 and R2 learning routes via e-BGP (R1 and R2 are not interconnected directly)
R3 and R4 are across R1 and R2, and R1/R2/R3/R4 are interconnected with GRE tunnels, and OSPF is running over them, in a full mesh.
R3 and R4 have static routes to a subnet, and i use a redistribute static subnets on R3 and R4 under OSPF processes, to make these routes known to R1 and R2.
R1 and R2 make their BGP routes known to R3 and R4 by using the redistribute bgp as subnets command under their OSPF configuration.
Finally R1 and R2 announce the networks from R3 and R4 into BGP with the network command. R1 and R2 see the static route from R3 and R4 as an OSPF E2 route, thus having a route will announce them into BGP.
What are the issues/dangers/complications with this type of setup?
R3 and R4 receive the BGP routes from R1 and R2 as OSPF E2 routes.
Is there chance of loops, routing issues in such a setup?
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