From: John (jgarrison1@austin.rr.com)
Date: Thu Feb 21 2008 - 01:35:32 ARST
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
This archive was generated by hypermail 2.1.4 : Sat Mar 01 2008 - 16:54:49 ARST