Steve, thank you for your answer. The problem is that my PA is learning a lot of routes with larger prefixes. So I would have to install a lot of static routes to solve the problem with the workarround that you suggest. Moreover, I would have to keep an eye on for new routes learnt by OSPF and install new static routes. The ideal solution would be to filter the routes learnt by OSPF but, as far as I know, PA doesn't support this feature. I opened another thread about this: https://live.paloaltonetworks.com/t5/General-Topics/How-to-ignore-routes-learned-by-OSPF/m-p/139314
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