9 comments on “IS-IS Levels and Adjacencies

  1. I was so confused with few of the IS-IS terms such as L1/L2 routers. However, now I got the clear idea. Thanks for sharing the nice article.

  2. Hey Jeff, thanks for this. I think learning IS-IS without having first learned OSPF would’ve been easier. But then that probably would’ve made learning OSPF harder, lol.

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