What is IS-IS?

What is IS-IS?

From The Art of Network Engineering by Andy and Friends

December 17, 2025 · 55 min

About this episode

The episode discusses the IS-IS routing protocol and its relevance in modern data center design.

Most network engineers know BGP, OSPF, and maybe EIGRP, but far fewer have hands-on experience with ISIS. In this episode of The Art of Network Engineering, Andy Lapteff sits down with Russ White and Mike Bushong for a deep, opinionated, and refreshingly honest discussion about routing protocol design in modern data centers. We explore why BGP has become the default hammer for every networking nail, what we lose when we blend underlay and overlay into a single protocol, and why some of the l...

People in this episode

Host: Andy Lapteff

Guests: Russ White, Mike Bushong

Topics covered

  • routing protocols
  • network engineering
  • data centers
  • BGP
  • ISIS
  • network design

Keywords

  • IS-IS
  • routing protocol
  • network engineering
  • BGP
  • data centers
  • network design

Mentioned in this episode

Organizations: BGP, OSPF, EIGRP, ISIS

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