Link State Protocol question

Unanswered Question
Dec 4th, 2007

IS-IS and OSPF are both link state. They both use SPF, but after SFP runs on IS-IS it then uses PRC making it just a bit faster/efficent than OSPF. If PRC is better why was it never integrated into OSPF? Afterall, OSPF is more widely used, and one would think OSPF would utilize every advanced feature that allows speed, and scalability. Hopefully this didn't seem like an uneducated question.

thank you.

I have this problem too.
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swmorris Tue, 12/11/2007 - 12:59

partial route calculations (PRC) are a subset of how ISIS works. You can actually do this in OSPF as well, at least in service provider releases.

There's a command called "ispf" which will allow for partial recalculations. But in addition to that, OSPFs concept of areas "kind of" follows similar guidelines.

If you had one giant area 0 then you would pretty much be out of luck there. :)

HTH,

Scott

[email protected]

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