From: Scott Morris (swm@emanon.com)
Date: Wed Oct 11 2006 - 13:07:45 ART
Well, ok, that could be true. So then just change how you summarize!
emanon-R1(config-router)#int fa0/0
emanon-R1(config-if)#ip summary-address eigrp 1 0.0.0.0 0.0.0.0 ?
<1-255> Administrative distance
leak-map Allow dynamic prefixes based on the leak-map
<cr>
emanon-R1(config-if)#ip summary-address eigrp 1 0.0.0.0 0.0.0.0 200
emanon-R1(config-if)#do sh ip ro
Codes: C - connected, S - static, 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
i - IS-IS, su - IS-IS summary, 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 0.0.0.0 to network 0.0.0.0
10.0.0.0/24 is subnetted, 1 subnets
C 10.10.10.0 is directly connected, FastEthernet0/0
D* 0.0.0.0/0 is a summary, 00:00:03, Null0
emanon-R1(config-if)#do sh ip ro 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
Known via "eigrp 1", distance 200, metric 28160, candidate default path,
type internal
Redistributing via eigrp 1
Routing Descriptor Blocks:
* directly connected, via Null0
Route metric is 28160, traffic share count is 1
Total delay is 100 microseconds, minimum bandwidth is 100000 Kbit
Reliability 255/255, minimum MTU 1500 bytes
Loading 1/255, Hops 0
emanon-R1(config-if)#
Now the created Null0 route has an AD of 200 instead of 5.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
IPExpert VP - Curriculum Development
IPExpert Sr. Technical Instructor
smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Brandon Bennett
Sent: Wednesday, October 11, 2006 11:29 AM
To: swm@emanon.com
Cc: 'Cisco certification'
Subject: Re: ip summary rip 0.0.0.0 0.0.0.0
Not if you are receiving your 0/0 from your IGP (be it EIGRP or another
protocol) and you decide to only send out a default route using this method.
Scott Morris wrote:
> If you didn't have a 0/0 route already, wouldn't you already have a
> routing hole? ;)
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Brandon Bennett
> Sent: Tuesday, October 10, 2006 6:35 PM
> To: Narbik Kocharians
> Cc: david robin; Cisco certification
> Subject: Re: ip summary rip 0.0.0.0 0.0.0.0
>
> Be careful. This will also create a route for 0.0.0.0/0 to Null0. If
> you don't have a static on this router to send traffic to you will
> create a routing hole.
>
> ~Brandon
>
> Narbik Kocharians wrote:
>> That's corect. The "summary-address 0.0.0.0 0.0.0.0" command in rip
>> will not send a default route, whereas in Eigrp it will.
>>
>> On 10/8/06, david robin <robindavi@gmail.com> wrote:
>>> Dear All,
>>> I want to be sure about something,
>>> ip summary rip 0.0.0.0 0.0.0.0 will not inject a default route,
>>> but in case of eigrp ip summary eigrp 0.0.0.0 0.0.0.0 it will send.
>>> am I right or it will send on both cases.
>>>
>>> thanks,
>
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