The endless story of OSPF vs IS-IS – Part 4 “The Inside Out”

May 22nd, 2010 mmahmoud Posted in Bury the hatchet, IGP, ISIS, Network Design, OSPF, Routing 2 Comments »

In this post we’ll be covering a couple of topics from the Inside Out of the link-state protocols that have always been ambiguous and full of details, we’ll try to make them as crystal clear as we can.

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The endless story of OSPF vs IS-IS – Part 3 “Packets and Database”

May 16th, 2010 mmahmoud Posted in Bury the hatchet, IGP, ISIS, Network Design, OSPF, Routing 3 Comments »

In this post we are going to cover the protocol packets and database structure for both routing protocols. To start let’s first highlight a couple of facts. OSPF runs on top of IP, that is it uses IP packets to exchange its messages (and thus it is vulnerable to spoofing and DoS attacks, and accordingly [...]

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The endless story of OSPF vs IS-IS – Part 2 “The history”

April 26th, 2010 mmahmoud Posted in Bury the hatchet, IGP, ISIS, Network Design, OSPF, Routing No Comments »

In our previous post we started consolidating the endless story of OSPF vs IS-IS, in this post we will cover the historical part of the story, it might not be interesting for some people, but I do believe that the history is what makes the future, so please bare with me through this post.

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The endless story of OSPF vs IS-IS

April 4th, 2010 mmahmoud Posted in Bury the hatchet, IGP, ISIS, Network Design, OSPF, Routing 1 Comment »

Whenever you have a little IGP chit chat you’ll hit this endless story. I’ve tried to reach a final solid conclusion my self but IMHO its all about personal preference and taste. It is something like a Ferrari vs Lamborghini story, they offer comparable performance, but totally different feeling. It is all about a good [...]

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OSPF & IS-IS Router ID

March 2nd, 2009 Wael Osama Posted in ISIS, OSPF 5 Comments »

When you think about Router ID in any link state protocol  two requirements come to mind: Each router must be identified by a Router ID and an Area to exist in. This Router ID must be unique inside a single IGP domain. IS-IS refers to the this ID as a System ID (SysID) and OSPF [...]

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Link state protocols and Areas concept

February 23rd, 2009 Wael Osama Posted in ISIS, Network Design, OSPF 8 Comments »

Link state protocols have introduced the concept of multiple routing areas withing the same routing domain. Link state protocols depend on the fact that all routers must have an identical link state database and then each router will start calculating its very own routing table from this information. However, this rule sometimes introduce scalability limitations [...]

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