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Episode:

Show 218 – OSPF Design Part 2
Category: Technology
Duration: 00:57:53
Publish Date: 2014-12-28 12:14:54
Description:


A long time ago, Packet Pushers ran an OSPF Design Part 1 show. That show went after the default design guides that network engineers have been reading for years, making the big point that you can scale a single OSPF area quite large indeed. But…that’s not the entire story about OSPF areas. Areas still have their use cases, and in this show (a long awaited part 2 that we did, seriously, get a lot of emails asking for), that’s what we get into.

Routing protocol geek Russ White and trainer Scott Morris join co-hosts Ethan Banks and Greg Ferro in this discussion about the usefulness of OSPF areas.

What We Discuss

  • What’s an area?
  • What are the different types of areas?
  • What’s an ABR? What’s an ASBR?
  • What are the concerns with parallel ABRs (two ABRs between 0 and 1 for instance)?
  • Why can’t you filter routes between OSPF routers in the same area?
  • What’s the significance of the backbone area?
  • Why must inter-area traffic traverse the backbone?
  • Can you create discontiguous areas with the same area ID? Why doesn’t this break things?
  • Use cases for OSPF areas.

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