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Re: Creating a default route in eigrp. posted 10/06/2006
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Another way to inject a default route in Eigrp is as follows:

ip route 0.0.0.0 0.0.0.0 null0

router eigrp xxx
network 0.0.0.0


On 10/6/06, Jung-I Lin <easyman.lin@xxxxxxxxx> wrote:
>
> Hi,
> I think the suggestion from cisco is for real networks not for our Lab
> attempt.
> It really depend on waht the lab is asking for in the exam.
>
> In my lab practicing, I use "summary-address" more than "redistribute
> static(default static route)".
>
> If you want to avoid seeing the discard-route(Null0 entry), you can use
> the
> command with AD of 255.
> With this you can still advertise a default-route to neighbor, but not
> install the null0 route in local routing table.
>
>
>
> On 10/2/06, Skinner, Stephen <Stephen.Skinner@xxxxxxxxx> wrote:
> >
> > Hello,
> >
> > I have taken the following excerpt from the 12.4 guide's on the CCO.
> >
> > I have added my comments in .
> >
> >
> > You should not use the ip summary-address eigrp summarization command to
> > generate the default route (0.0.0.0) from an interface. (OK no problem)
> >
> > This causes the creation of an EIGRP summary default route to the null 0
> > interface with an administrative distance of 5.(Yep , I have seen it
> > happen)
> >
> > The low administrative distance of this default route can cause this
> route
> > to displace default routes learned from other neighbours from the
> routing
> > table.
> > (i.e. other routing protocol's.)
> > If the default route learned from the neighbours is displaced by the
> > summary
> > default route, or if the summary route is the only default route
> present,
> > all traffic destined for the default route will not leave the router,
> > instead, this traffic will be sent to the null 0 interface where it is
> > dropped.
> > (yep I get it )
> >
> > The recommended way to send only the default route out a given interface
> > is
> > to use a distribute-list command. You can configure this command to
> filter
> > all outbound route advertisements sent out the interface with the
> > exception
> > of the default (0.0.0.0).
> >
> > OK . My question .
> >
> > With the summ-address command It actually creates the default as well as
> > sending it out.
> >
> > So What is the preferred method of creating a Default route in eigrp ? .
> > I cant use the "default-information" command as it only effect's if E
> will
> > receive the default , not how to create it.
> >
> > If I cant use the summary-address how else can I create the default.?
> >
> > TIA
> >
> > Stephen Skinner
> >
> >
> >
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> --
> Thanks
> Best Regards,
>
> Jung-I Lin
>
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-- 
Narbik Kocharians
CCIE# 12410 (R&S, SP, Security)
CCSI# 30832
Network Learning, Inc. (CCIE class Instructor)
www.ccbootcamp.com (CCIE Training)