Category: OSPF
When OSPF Becomes a Distance Vector Protocol
We were always told that Open Shortest Path First (OSPF) is a fast converging link-state routing protocol that always results in a loop-free and blackhole-free network topology. In reality, it’s a link-state protocol within an area and almost a distance-vector protocol between areas.
In this article, I’ll illustrate how this unexpected behavior can affect the convergence of your network and how you can use proprietary extensions of Cisco IOS to alleviate the undesired side effects of OSPF.