From: Rajeev Siddappa (raj_lab@xxxxxxxxx)
Date: Fri Jan 11 2002 - 03:51:33 GMT-3
Not an acceptab;e answer. We are now looking at the
routing table of the router on which all these is
configures. So......... your explanation may not be
true.
Rajeev.
--- Frank B <frank@buff-net.com> wrote:
> Auto-summarization only takes place when you cross
> classful boundaries.
> You have 2 interfaces connected within the
> 168.71.0.0 space; so it sends
> advertisements out those interfaces for subnets
> within 168.71.0.0
>
> However, other networks advertised out those
> interfaces are summarized
> on their classful boundary. Hope this helps.
>
> Frank
>
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> CCIE Lab
> Sent: Thursday, January 10, 2002 7:34 PM
> To: j killion; Steven; ccielab
> Subject: Re: eigrp auto-summary and a null 0 route
>
> good, but why didn't it also create a summary route
> to
> null for 168.71.0.0 subnets?
>
> --- j killion <jkillion1977@yahoo.com> wrote:
> > Once you added the "auto-summary" cmd, EIGRP will
> > now
> > summarize at network boundaries - in this case at
> > 20.0.0.0/8. It creates the summary pointing to
> > Null0
> > to stop routing loops from forming.
> >
> >
> > --- Steven <adream@163.com> wrote:
> > > On one router which runs eigrp only ,the config
> > and
> > > route table is as follows,
> > >
> > > sh run
> > > ...
> > > router eigrp 1
> > > network 20.0.0.0
> > > network 168.71.7.0 0.0.0.255
> > > network 168.71.9.0 0.0.0.255
> > > no auto-summary
> > > no eigrp log-neighbor-changes
> > >
> > > ...
> > >
> > > 168.71.0.0/24 is subnetted, 4 subnets
> > > C 168.71.9.0 is directly connected,
> Serial1
> > > C 168.71.7.0 is directly connected,
> Serial0
> > > D 168.71.6.0 [90/20768000] via 168.71.9.1,
> > > 00:00:17, Serial1
> > > D 168.71.5.0 [90/20384000] via 168.71.9.1,
> > > 00:00:17, Serial1
> > > 20.0.0.0/24 is subnetted, 1 subnets
> > > C 20.1.1.0 is directly connected,
> Loopback0
> > >
> > >
> > > after i add "auto-summary "command under router
> > > eigrp 1
> > >
> > > the route table change to the following one ,
> > >
> > > 168.71.0.0/24 is subnetted, 4 subnets
> > > C 168.71.9.0 is directly connected,
> Serial1
> > > C 168.71.7.0 is directly connected,
> Serial0
> > > D 168.71.6.0 [90/20768000] via 168.71.9.1,
> > > 00:00:03, Serial1
> > > D 168.71.5.0 [90/20384000] via 168.71.9.1,
> > > 00:00:03, Serial1
> > > 20.0.0.0/8 is variably subnetted, 2
> subnets,
> > 2
> > > masks
> > > D 20.0.0.0/8 is a summary, 00:00:01, Null0
> > > C 20.1.1.0/24 is directly connected,
> > Loopback0
> > >
> > >
> > > i just want to know what "D 20.0.0.0/8 is
> a
> > > summary, 00:00:01, Null0"
> > > mean.Why is it added?
> > >
> > >
> > >
> > > Thanks.
> > >
> >
>
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