Posts Tagged ‘ospf fa’


I enjoyed Petr’s article regarding explicit next hop.  It reminded me of a scenario where a redistributed route, going into OSPF conditionally worked, depending on which reachable next hop was used.

Here is the topology for the scenario:

3 routers ospf fa blogpost

Here is the relevant (and working :) ) information for R1. Continue Reading

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OSPF FA Overview

This post is dedicated to one “esoteric” OSPF external route filtering method based on hiding OSPF Forwarding Address. Recall the meaning of OSPF FA. This is a special field used on OSPF type 5 and 7 LSAs to convey the information of the “external route source”. The purpose of FA is to optimize forwarding in situations where the external route source is connected to a shared segment. Here is an example:

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