From: Nathan Chessin (nchessin@cisco.com)
Date: Mon Nov 04 2002 - 20:38:04 GMT-3
Hedi,
EIGRP will not summarize external routes unless there is a component route
of the same major network that is an internal route.
Check out the link for more info on summarization.
http://www.cisco.com/warp/public/103/eigrp5.html
Nate
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Hedi Abdelkafi
> Sent: Monday, November 04, 2002 1:42 AM
> To: GroupStudy (E-mail)
> Subject: EIGRP summarization of external routes
>
>
> Hi all,
>
> I read a few times ago a document on the summarization of
> external routes within EIGRP.
> Here's the content :
> EIGRP Autosummarization rules when working with external routes (EX) :
> 1.If an external route and one (or more) "normal" route are
> in the same major IP networks as the summary route, the
> external route is not advertised and only the summary routes
> is advertised.
> 2.If there are only external routes that make the summary
> route, no route at all are advertised (NOT even the summary route !!).
>
> Example case 1 : 11.1.1.0/24 is an external route (via
> redistribute command) and 11.1.2.0/24 is a direcly connected
> network. In that case, the router advertised only the summary.
> router eigrp 1
> redistribute connected route-map test
> auto-summary
> network 11.0.0.0
>
> Example case 2 : 11.1.1.0 and 11.1.2.0 are external route. In
> that case, no routes are advertised.
> router eigrp 1
> redistribute connected route-map test
> auto-summary
> network 11.0.0.0
>
> I tested this configuration.
>
> In both case, I received the the summary route wich means
> that the second rule is false.
>
> Can you confirm, please ?
>
> Bye
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