Re: How is default-information command under router eigrp used?

From: Ben (bmunyao@gmail.com)
Date: Wed Jul 11 2007 - 08:30:55 ART


Gary, Yemi

Sorry I meant to use "no default-information out". Now I understand;

It tells R2 not to redistribute the default and any D EX from eigrp10 to
eigrp20.

I think Gary may have a point on whether it should be in or out. The same
usage when we use distribute-list command is as follow:

access-l 1 deny 10.1.1.0
access-l 1 permit any
router eigrp 20
  redistr eigrp10
  distribute-list 1 out eigrp10

This is interpreted to mean that only routes permitted by ACL will be
redistributed "out" of eigrp10 to eigrp20.

Perhaps the default-information command uses the same interpretation of
direction. The usage in the scenario would then be:

router eigrp20
  redistr eigrp10
  no default-information out

What do you think? I don't have lab equipment for trying this out.

Ben

On 7/11/07, Gary Duncanson <gary.duncanson@googlemail.com> wrote:
>
> I wonder if it should be no default-information in.
>
> Gary
> ----- Original Message -----
> From: "Ben" <bmunyao@gmail.com>
> To: "Salau, Yemi" <yemi.salau@siemens.com>
> Cc: <dayo@ademuyiwa.com>; "Cisco certification" <ccielab@groupstudy.com>
> Sent: Wednesday, July 11, 2007 11:32 AM
> Subject: Re: How is default-information command under router eigrp used?
>
>
> > Yemi,
> > Thanks for responding. Here's an attempt at putting your explanation
> into
> > a
> > scenario
> >
> >
> > 10.1.1.1 10.1.2.1 10.1.2.2
> > 10.1.3.1
> >
> ----eigrp10------(f0/0)R1(s0/0)-----------eigrp10-------------(s0/0)R2(f0/0)---eigrp20--
> >
> > R1
> > int f0/0
> > ip add 10.1.1.1 255.255.255.0
> > int s0/0
> > ip add 10.1.2.1 255.255.255.0
> > ip summary-add eigrp 100 0.0.0.0 0.0.0.0
> > router eigrp 10
> > net 10.1.2.1 0.0.0.0
> > net 10.1.1.1 0.0.0.0
> >
> > R2
> > int f0/0
> > ip add 10.1.3.1 255.255.255.0
> > int s0/0
> > ip add 10.1.2.2 255.255.255.0
> > router eigrp 10
> > net 10.1.2.2 0.0.0.0
> > redistr eigrp 20
> > router eigrp 20
> > net 10.1.3.1 0.0.0.0
> > redistr eigrp 10
> > no default-originate out
> >
> > R2 is receiving a default from R1 on process eigrp10, and redistributing
> > to
> > process eigrp20. Would the use of this command as indicated then prevent
> > R2
> > from sending the default into eigrp20? If yes, how do ACLs fit in?
> >
> > Ben
> >
> >
> > On 7/11/07, Salau, Yemi <yemi.salau@siemens.com> wrote:
> >> Normally and by default, exterior routes are always accepted and
> default
> >> information is passed between EIGRP processes when redistribution
> >> occurs. i.e you have the command turned on: "default-information in"
> but
> >> hidden in the IOS I believe.
> >>
> >> Let's say redistributing RIP or another EIGRP Process A into another
> >> EIGRP Process B, by default all the external routes and default
> >> information goes into the EIGRP Process B, but you can use this command
> >> {"no default-information in/out"} to suppress or not accept exterior or
> >> default routing information in incoming or outbound updates. In other
> >> words, you can stop your EIGRP Process from receiving or sending out
> >> exterior updates and default routes.
> >>
> >> Hope this helps ... :-)
> >>
> >> Many Thanks
> >>
> >> Yemi Salau
> >>
> >> -----Original Message-----
> >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> >> Ben
> >> Sent: Wednesday, July 11, 2007 10:28 AM
> >> To: dayo@ademuyiwa.com; Cisco certification
> >> Subject: Re: How is default-information command under router eigrp
> used?
> >>
> >> Dayo,
> >>
> >> Thanks for responding.
> >>
> >> In eigrp, the syntax for this command is:
> >>
> >> router eigrp 100
> >> default-information {allowed[in|out]|in|out [acl]}
> >>
> >> I'm having trouble figuring out how to use it, and scenarios that
> apply.
> >>
> >> Ben
> >>
> >>
> >>
> >> On 7/11/07, dayo@ademuyiwa.com <dayo@ademuyiwa.com> wrote:
> >> >
> >> > Do you mean default information originate?
> >> >
> >> > On 7/11/07, Ben <bmunyao@gmail.com> wrote:
> >> > > Hi
> >> > >
> >> > > I cann't seem to make sense of how to use the "default-information"
> >> > command
> >> > > under EIGRP. Does anyone here have examples of its usage that might
> >> help
> >> > me
> >> > > digest this command.
> >> > >
> >> > > TIA
> >> > >
> >> > > Ben
> >> > >
> >> > >
> >> _______________________________________________________________________
> >> > > Subscription information may be found at:
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> >>
> >> _______________________________________________________________________
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> >
> > _______________________________________________________________________
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