From: sabrina pittarel (sabri_esame@yahoo.com)
Date: Fri Aug 11 2006 - 18:56:04 ART
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> --- Original Message Follows ---
>
> Date: Fri, 11 Aug 2006 17:44:18 -0400
> To: ccielab@groupstudy.com
> From: sabri_esame@yahoo.com
> Subject: OSPF and the distance command
>
> Hi all,
> I'm trying to understand how ospf behaves in
> relation with the following command:
>
> distance <#> <route-source> <wildcard> <acl>
>
> I have the following topology:
>
>
> R1 --------
> |
> R3
> |
> R2 --------
>
>
>
> R1, R2 and R3 are all in area 0. All routers have
> their loopbacks advertised in area0.
>
> R1 and R2 are also ASBRs and can reach the same set
> of external networks.
>
> I want to configure R3 in such a way it will forward
> all traffic for external networks to R2.
> I know I can accomplish that modifying the
> redistribution metrics in R1 and R2, but as I said
> I'm trying to understand how the *distance* command
> behaves.
>
> I thought I could solve the problem doing the
> following:
>
> R3
> ---
>
> router ospf #
> distance 109 <R2 RID> 0.0.0.0 1
>
> access-list 1 deny <R1's loopback>
> access-list 1 permit any
>
> but it doesn't work.
>
> All external routes are still load balanced between
> R1 and R2 and show up in the routing table with AD
> 110.
> The only route with AD = 109 is R2's loopback. If I
> remove the acl from the distance command, i.e.
>
> distance 109 <R2 RID> 0.0.0.0
>
> also R1's loopback will be shown with distance 109
> and R2 will be preferred (!!!). All other routes
> will still be load balanced and will have AD 110
>
> Only if I shut the link between R1 and R3 I finally
> see these routes with an AD of 109.
>
> I really don't understand what is going on, any
> ideas?
>
>
> Thanks
> Sabrina
>
> (Original message truncated)
>
>
>
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