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How to deny a route being learned via OSPF

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Article ID: KB15577 KB Last Updated: 23 Nov 2009Version: 1.0
Summary:
How to deny a route being learned via OSPF
Symptoms:
Trying to deny a route being learned by OSPF on the firewall.
Solution:
On ScreenOS firewalls, routes learned via OSPF cannot be denied. Once the upstream router advertises the routes, the ScreenOS firewall will put the route into the OSPF database and it cannot be filtered out.  If this is causing an issue in your environment, there are the following work-arounds:
  • Configure the upstream router to not advertise the route
  • Use another Dynamic Routing Protocol to learn the routes from the upstream router.  The same prefix could be learned from this other routing protocol with a higher preference than OSPF. This will force the firewall to install the route via another DRP instead of OSPF.
  • On the ScreenOS firewall, add a static route pointing to null interface to avoid forwarding traffic to the unwanted network.
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