From: Rajeev Siddappa (raj_lab@xxxxxxxxx)
Date: Fri Jan 11 2002 - 04:36:26 GMT-3
Frank, I understand.
Pls see below,
> > Auto-summarization only takes place when you cross
> > classful boundaries.
We are not crossing any classful boundaries here.
We are still in the same router.
> > 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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