Hi, I've done this a few time with both BGP and OSPF, but always with having the traffic physically leaving the firewall like you say. It's usually been scenarios with multiple vsys, with OSPF/BGP needed between VRs in different vsys's. This has been stable and worked as expected. With a multi-vsys environment, I think it makes sense to have the traffic leave the device, as there are some throughput limitations on inter-vsys routing, and you would have one session pr vsys for each "session" anyway. Never tried exactly the same scenario as you are describing though. Not sure if I would trust the routing functionally in Palo Alto enough to do that anyway. Have seen some strange bugs related to ospf in previous releases. But if you manage to get it working, it would be nice to know how 🙂 - Tor
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