On Wednesday, May 29, 2013 05:37:17 AM Glenn Kelley wrote: > I can see how OSPF can become a nightmare to handle if it > is not planned well - but I also find the folks who I > end up stepping in when they are stuck have tons of > other issues.
In the workshops I and a close friend give, we normally say that OSPF teaches good network design because of its rigidity with regard to requiring that all areas reach back to Area 0. So when we start teaching the IS-IS modules, it turns out to be very simple because with IS-IS, you don't really need areas (even though you can introduce hierarchy with multiple levels), and since there is no requirement for IS-IS routers to connect back to a so-called "backbone area", the protocol lends itself well to networks that are stringy (rather than star-based) in nature. So I would teach OSPF first, so folk understand the nuances of what it means to scale up OSPF, and then teach IS-IS on the back of that which completely de-mystifies it. Cheers, Mark.
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