From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Wed Feb 20 2008 - 23:54:23 ARST
The quote from the DocCD doesn't exclude connected routes. It just says
"specific routes" which the connected route is.
Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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>----- Original Message -----
Subject: A question about "ip summary-address eigrp"
Date: Wed, February 20, 2008 6:59
From: "YourPal" <dearprudence28@gmail.com>
> 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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