The assignment of router’s interfaces into OSPF areas should be a non-issue these days, but for whatever reason some of the students I’m mentoring still use the ridiculous practice that was promoted in older learning materials: a separate network statement using IP subnet and inverse subnet mask for every single interface. I’ve documented what I consider to be best practices in the “OSPF area configuration best practices” article in the CT3 wiki. If you disagree with my opinion, please feel free to edit my article or share your thoughts in a comment to this post.
Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.