From: YourPal (dearprudence28@gmail.com)
Date: Thu Feb 21 2008 - 05:43:43 ARST
Hi John,
Before I posted this issue to GS, I did test configuring a summary address
which is not 167.1.x.x. True, it's not installed in the local routing table
nor advertised to other neighbors.
Thanks all you guys for the great pointers :-)
BR,
Emil
On 2/21/08, John <jgarrison1@austin.rr.com> wrote:
>
> Emil,
>
> You said it twice. You can't find your hat cause it's on your head.
>
> You have a network statement of 167.1.34.4 you have a summary address of
> 167.1.0.0. 167.1.34.0 is a "component"(subnet) of 167.1.0.0 so the
> summary
> is advertised, as the as you said it should be. Try a summary address of
> anything but 167.1 and you should't see it on other routers in the AS.
>
> ----- Original Message -----
> From: "YourPal" <dearprudence28@gmail.com>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, February 20, 2008 8:59 AM
> Subject: A question about "ip summary-address eigrp"
>
>
> > Hi Group,
> >
> > I have the following config:
> >
> > R4:
> > !
> > interface Serial0/0
> > ip address 167.1.34.4 255.255.255.0
> > ip summary-address eigrp 10 167.1.0.0 255.255.0.0 5
> > !
> > router eigrp 10
> > network 167.1.34.4 0.0.0.0
> > no auto-summary
> > !
> >
> > R4#sh ip ei i
> > IP-EIGRP interfaces for process 10
> >
> > Xmit Queue Mean Pacing Time Multicast
> > Pending
> > Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer
> > Routes
> > Se0/0 1 0/0 33 0/15 139
> > 0
> >
> > R4#sh ip ro con
> > 167.1.0.0/16 is variably subnetted, 7 subnets, 3 masks
> > C 167.1.34.0/24 is directly connected, Serial0/0
> >
> > R4#sh ip ro | i Null
> > D 167.1.0.0/16 is a summary, 00:01:17, Null0
> >
> >
> > I'm under the impression that if there are more specific routes (within
> > the
> > range of the summary-address) being advertised out int s0/0, the summary
> > address will be advertised.
> >
> > In this case, there are no component routes but why the summary is still
> > advertised (as verified on other EIGRP routers and also the presence of
> > the
> > summary route pointing to Null0 on R4)? I guess it has something to do
> > with
> > R4's s0/0 IP address which is within the range of the summary.
> >
> > According to DocCD:
> >
> > --------------------------------------------------------
> > You can configure a summary aggregate address for a specified interface.
> > If
> > any more specific routes are in the routing table, EIGRP will advertise
> > the
> > summary address out the interface.
> > --------------------------------------------------------
> >
> > In my case, the specific route is s0/0, isn't it?
> >
> > Please advise.
> >
> >
> > Thank you.
> >
> > BR,
> > Emil
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