Is it possible to pass OSPF routes through a GRE tunnel and still pass data traffic to a firewall for inspection? Please see our setup below:
\ / |\ /|
FW ------> | \/ |
/ \ | /\ |
C----D |/ \|
Devices A,B,C and D are Catalyst 6500 swiches. The FW is not a Cisco device. We plan to use GRE tunnel from A-C, A-D, B-C, and B-D to form a redundant setup. Only OSPF updates should pass through the GRE tunnel while actual data traffic should pass through the FW. Static routes are also used from C/D to FW and FW to A/B and vice versa. We need to pass dynamic routing updates (OSPF) from C and D so any changes made to the network below the C and D devices can be learned dynamically.
Any help will be greatly appreciated.
Thanks and Best Regards.