From: Ron (id353@singnet.com.sg)
Date: Mon Nov 04 2002 - 23:06:51 GMT-3
Group,
Is it a good practice to always turn off auto-summary on the EIGRP protocol to allow finer control over your routes or to turn it off only if there is a real need for it ?
Seems to have a difference between turning it off in a lab environment and in an actual production setup. Of course, I would love to enable it in my company's network as route stability will be enforced but it seems to me that turning summarization off in the lab is the way to go.
Ron.
From Nathan Chessin <nchessin@cisco.com> on 4 Nov 2002:
> 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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