From: Holmes Holmes (iamholmes@gmail.com)
Date: Thu Sep 22 2005 - 11:20:49 GMT-3
Ouch. Let me try the diagram again :
4.0
Blathers------------Duff
| |
| |
| 3.0 | 5.0
| OSPF |
| |
| |
--Bumble- - - - -Grimwig- - -
| |
| |
|2.0 RIP | 6.0
| |
| |
Monk-----------------+
|
| 1.0
|
Thanks again.
On 9/22/05, Holmes Holmes <iamholmes@gmail.com> wrote:
>
> Hi all -
>
> This is with reference to Doyle's Vol 1, pg 592. I've included details (a
> diagram, config and
> routing tables) at the end of this mail. Now what I don't understand is,
> why does
> Bumble have the following route :
>
> R 192.168.1.0/24 <http://192.168.1.0/24> [120/1] via
192.168.2.2<http://192.168.2.2>
> ,
>
> Since we have done mutual redistribution, shouldn't we have an 'O E2'
> route
> (as in fact Grimwig has), instead of this R route ? My logic being, that
> since we have
> done mutual redistribution, there is both an OSPF and a RIP route to
> 192.168.1.0 <http://192.168.1.0>.
> (We have a /24 route throughout this network). Since longest prefix
> doesn't come
> into the picture, shouldn't the lower AD OSPF
192.168.1.0<http://192.168.1.0>route be the preferred route
> in the routing table ?
>
> Diagram and relevant details follow :
> 4.0
> Blathers------------Duff
> | |
> | |
> | 3.0 | 5.0
> | OSPF |
> | |
> | |
> - -Bumble- - - - -Grimwig- - -
> | |
> | |
> | 2.0 RIP | 6.0
> | |
> | |
> Monks ------------+
> |
> | 1.0
> |
>
> for brevity in the diagram above , x.o = 192.168.x.0
>
> Bumble#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
>
> Gateway of last resort is not set
>
> O 192.168.4.0/24 <http://192.168.4.0/24> [110/20] via
192.168.3.1<http://192.168.3.1>,
> 00:34:43, Ethernet0/1
> O 192.168.5.0/24 <http://192.168.5.0/24> [110/84] via
192.168.3.1<http://192.168.3.1>,
> 00:34:43, Ethernet0/1
> O E2 192.168.6.0/24 <http://192.168.6.0/24> [110/50] via
192.168.3.1<http://192.168.3.1>,
> 00:34:43, Ethernet0/1
> R 192.168.1.0/24 <http://192.168.1.0/24> [120/1] via
192.168.2.2<http://192.168.2.2>,
> 00:00:11, Ethernet0/0
> C 192.168.2.0/24 <http://192.168.2.0/24> is directly connected,
> Ethernet0/0
> C 192.168.3.0/24 <http://192.168.3.0/24> is directly connected,
> Ethernet0/1
> Bumble#
>
>
-----------------------------------------------------------------------------
------------------------
>
> Grimwig#sh ip route
> 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
>
> Gateway of last resort is not set
>
> O 192.168.4.0/24 <http://192.168.4.0/24> [110/74] via
192.168.5.1<http://192.168.5.1>,
> 00:43:14, Serial0
> C 192.168.5.0/24 <http://192.168.5.0/24> is directly connected, Serial0
> C 192.168.6.0/24 <http://192.168.6.0/24> is directly connected, Ethernet0
> O E2 192.168.1.0/24 <http://192.168.1.0/24> [110/50] via
192.168.5.1<http://192.168.5.1>,
> 00:43:14, Serial0
> O E2 192.168.2.0/24 <http://192.168.2.0/24> [110/50] via
192.168.5.1<http://192.168.5.1>,
> 00:43:14, Serial0
> O 192.168.3.0/24 <http://192.168.3.0/24> [110/84] via
192.168.5.1<http://192.168.5.1>,
> 00:43:14, Serial0
> Grimwig#
>
> Many thanks
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