From: Jeongwoo Park (Jpark@xxxxxxxx)
Date: Thu Dec 27 2001 - 17:15:06 GMT-3
Ok. Now I am clear about my original post. Once I removed the secondary
address(172.16.0.0), auto-summary took place in Router A.
But I found something different from what Cisco doc says. This time I have a
problem because auto-summary is taking place when it is not supposed to be.
Here is what is going on;
.
When I looked at the Cisco link
http://www.cisco.com/warp/public/103/eigrp5.html#3 that Annu send me, it
says "EIGRP will not auto-summarize external routes unless there is a
component of the same major network that is an internal route. "
In Router A, auto-summary is taking place even if these three loopback
subnets are external to EIGRP.
Here is my config and routing table.
Router A:
!
interface Loopback1
ip address 172.16.1.1 255.255.255.252
no ip directed-broadcast
!
interface Loopback2
ip address 172.16.1.5 255.255.255.252
no ip directed-broadcast
!
interface Loopback3
ip address 172.16.1.9 255.255.255.252
no ip directed-broadcast
!
interface Ethernet0
ip address 192.168.1.249 255.255.255.0
no ip directed-broadcast
no ip split-horizon eigrp 1
!
router eigrp 1
redistribute connected
network 192.168.1.0
!
ip http server
ip classless
!
line con 0
password xxx
transport input none
stopbits 1
line vty 0 4
exec-timeout 0 0
password xxx
login
!
end
sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 192.168.1.250 to network 0.0.0.0
172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 172.16.1.8/30 is directly connected, Loopback3
C 172.16.1.4/30 is directly connected, Loopback2
D 172.16.0.0/16 is a summary, 00:40:15, Null0
C 172.16.1.0/30 is directly connected, Loopback1
C 192.168.1.0/24 is directly connected, Ethernet0
D*EX 0.0.0.0/0 [170/32043520] via 192.168.1.250, 00:44:08, Ethernet0
Can someone tell me what I am missing here?
JP
-----Original Message-----
From: Annu [mailto:annu_roopa@yahoo.com]
Sent: Thursday, December 27, 2001 7:09 AM
To: Chua, Parry; Jeongwoo Park; ccielab@groupstudy.com
Subject: RE: EIGRP auto summary
JP,
The reason for ur EIGRP not auto-summarizing is that
by default EIGRP does not auto-summarise external
routes if there is no internal component of that major
network in its table.
>From ur Lab it looks like EIGRP primary add is
192.168.x.x and the net u are trying is 172.16.0.0
which does not have a entry (secondary address dont
count i think).
Look at this example and hopefully this is the
problem.
http://www.cisco.com/warp/public/103/eigrp5.html#3
Hope this helps,and let me know.I want to know what is
the reason if i am not correct.
Annu
--- "Chua, Parry" <Parry.Chua@compaq.com> wrote:
> Hi,
>
> I perform the similar test, the secondary address at
> ethernet is the
> cause of
> no autosummary. Once you remove the secondary Ip
> address, the summary
> route will be
> show in both routers. next you create a secondary IP
> address with
> different major
> network and advertise it, you will see that it does
> not auto summary for
> this new Ip
> address
>
> Parry Chua
>
> -----Original Message-----
> From: Jeongwoo Park [mailto:Jpark@wams.com]
> Sent: Thursday, December 27, 2001 4:28 PM
> To: 'ccielab@groupstudy.com'
> Subject: EIGRP auto summary
>
>
> Hi
> I created the three loopback interfaces in EIGRP
> running router( Router
> A)
> as following to see if this router can do
> auto-summary.
> Router A:
> !
> interface Loopback1
> ip address 172.16.1.1 255.255.255.252
> no ip directed-broadcast
> !
> interface Loopback2
> ip address 172.16.1.5 255.255.255.252
> no ip directed-broadcast
> !
> interface Loopback3
> ip address 172.16.1.9 255.255.255.252
> no ip directed-broadcast
> !
> interface Ethernet0
> ip address 172.16.10.10 255.255.255.0 secondary
> ip address 192.168.1.249 255.255.255.0
> no ip directed-broadcast
> no ip split-horizon eigrp 1
> !
> router eigrp 1
> redistribute connected
> network 172.16.0.0
> network 192.168.1.0
> !
> ip http server
> ip classless
> !
> line con 0
> password xxx
> transport input none
> stopbits 1
> line vty 0 4
> exec-timeout 0 0
> password xxx
> login
> !
> end
>
> now I checked the other router (Router B) that is
> connected through
> Ethernet
> in order to see if this three loopback subnets were
> auto summarized.
> Unfortunately No even if auto-summary was on by
> default.
> From router B, I was able to see each indivisual
> subnet entries, which
> means
> auto-summary is not working.
> I could manually summarize these three subnet after
> disabling
> auto-summary,
> not automatically.
> Do you know why?
>
> I will appreciate your inputs.
>
> JP
>
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