From: Peter Van Oene (petvan@gmail.com)
Date: Mon Sep 26 2005 - 13:04:39 GMT-3
This is normal. ABR's only look at type 3's from the backbone for IA
reachability. This is a loop prevention mechanism. Thus, R3 isn't allowed to
use the type3 from R2 for the R4 route.
On 9/25/05, Stefan Grey <examplebrain@hotmail.com> wrote:
>
> Hi, group,
> I see such behaviou the first time:
>
> R4
> |
> |
> R1------R2
> | __ |
> | _|
> | |
> R3----
>
>
>
>
> Between R1 and R4 is area 3, between router R3 and R1 area 0. Between R1
> and
> R2 area 0. connection between R3 - R2 area 1. As to physical connections:
> between R1 and R4 ethernet, between R3 and R2 ethernet. Between R1,R2 nbma
> frame-relay, between R1 -R3 ISDN. Everything is configured correctly. R3
> gets two routes about lo0 of R4 from R1 and R2.
> on R1 is configured the ip ospf 9999 command to make this route less
> preffereable than from R2. But what strange thing wee see:
>
>
> O IA 1.1.6.6/32 <http://1.1.6.6/32> [110/10001] via
1.1.35.5<http://1.1.35.5>,
> 00:17:32, BRI0/0
> I wonder why the less prefereble route is used?? Ok I turn of the bri0/0
> interface
> and look which other route I get from router R2.
>
> O IA 1.1.6.6/32 <http://1.1.6.6/32> [110/76] via 1.1.23.2<http://1.1.23.2>,
> 00:00:29, Ethernet0/1
> This route is the same as previous but with much better metric. Why it is
> not choosed?? But the worther one is choosed??
>
>
> Thanks,
>
> The only one advantage of the route through R1 is that R1 - R3 is in
> AREA0.
> But as we know the route is choosed just in two criterias AD/ Metric.
> I am totally confused with this.
>
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