From: Narbik Kocharians (narbikk@gmail.com)
Date: Mon Sep 15 2008 - 10:48:47 ART
Well here we have two routers that performed summarization, R2 and R4, R2 as
you mentioned summarized internal OSPF routes, internal meaning that they
are all internal to OSPF routing domain, so when removing the discard route,
you should specify the "internal" keyword, whereas, R4 is summarizing the
external routes and it must specify the discard route as being "external".
Well imagine that your ABR is also an ASBR and you only needed to remove the
discard route for the internal and NOT external, how would you remove it if
the keyword internal or external was not specified?
You see that's why they did that.
Let me know if you need more clarification.
On Mon, Sep 15, 2008 at 5:51 AM, Scott Morris <swm@emanon.com> wrote:
> LSA types.
>
> Internal = area-range
> External = summary-address
>
> HTH,
>
> Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Roger Oliver
> Sent: Monday, September 15, 2008 1:13 AM
> To: ccielab@groupstudy.com
> Subject: OSPF discard-route
>
> 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
>
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-- Narbik Kocharians CCSI#30832, CCIE# 12410 (R&S, SP, Security) www.MicronicsTraining www.Net-Workbooks.com Sr. Technical InstructorBlogs and organic groups at http://www.ccie.net
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