Re: OSPF Summerisation seen on one spoke but not another

From: Ramanpreet Singh (sikandar.raman@gmail.com)
Date: Sat Oct 18 2008 - 10:06:03 ART


If I have understood your question correctly, you are trying to filter LSA
Type-3. THe first step will be to configure a prefix-list as follows

ip prefix-list TEST seq 5 deny x.x.x.x/22
ip prefix-list TEST seq 10 permit 0.0.0.0/0 LE 32

Once you have configured your prefix-list apply it to area that it must be
filtered from, in this case its area 10? right? . It has to be configured on
an ABR.

on R2

router ospf XX
area 10 filter-list prefix TEST in.

I hope I have understood your question correctly!

Thanks,
Raman

On 10/18/08, stephen skinner <stephenski@gmail.com> wrote:
>
> hello,
>
> could anyone shed some light on this please.
>
> i have the following topology
>
> R1 R3
> - -
> - -
> --
> R2 -----------R4
>
>
> hub and spoke topology for R1 , R2, R3 all using physicall interfaces.
>
> Ethernet topology fot R2-R4
>
> R1,R2,R3 area in area 10 ( OSPF point-to-Multipoint interfaces)
> R2 and R4 are in area 0 ( OSPF Broadcast interfaces)
>
> R4 area 0 is sending the following networks
>
> 10.10.10.0/24
> 10.10.11.0/24
> 10.10.12.0/24
>
> and i have created a summary on R2 using a /22 network to send to area 11.
>
> is there any way to send this summary to just R3 instead of R1 ???
>
> i know i can filter it out on R1, but i wanted to try and stop it leaving
> R2
> bound for R1
>
> i have been trying differnet things, Area filter , outbound distribute list
> ,
>
> but nothing seems to work ,
>
> does anyone have any idea.
>
> TIA
>
>
> --
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