From: Bogdan Sass (bogdan.sass@catc.ro)
Date: Mon Sep 15 2008 - 03:29:49 ART
Roger Oliver wrote:
> okay fuzzy understanding
>
> R1 <--Area1--> R2 <--Area0--> R3 <--Area2--> R4
>
> R2 is summarizing 1.1.0.0/22 (which are the hosts on R1)
> R4 is summarizing 4.4.0.0/22 (which are it's local loopbacks)
>
> Why do I put on
> R2 "no discard-route internal"
> R4 "no discard-route external"
>
> What is the logic?
>
> R4 is doing it's own summary or it's own connected routes so they are
> "external"?
>
> While R2 is summarizing routes it gets from another host so they are
> "internal"?
>
> Is this just another one of those it made sense to the person that wrote
> it when they were drinking beers and coding at 4am on their last day on
> the job?
>
> Thank you for comments.
>
> Now that I write this it makes more sense but clarification of my bad
> dream would be appreciated.
> roger
> divineone@divine-wind.net
>
>
"Internal" and "external" refer to the autonomous system. R2 is
summarizing inter-area (for routes that are received via OSPF, so they
are internal to the AS), while R4 is summarizing redistributed networks
(hence, "external" to the OSPF domain).
For more details, see here:
http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_osp1.html#wp1013010
-- Bogdan Sass CCAI,CCNP,CCSP,JNCIA-ER Information Systems Security Professional "Curiosity was framed - ignorance killed the cat"Blogs and organic groups at http://www.ccie.net
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