Re: How to filter external OSPF routes from database ?

Hi,

Take a look at the following free class on demand and you will master that
topic in minutes:
http://www.micronicstraining.com/videos/filtering-ospf-prefixes-section-1.zip

HTH,

--
Piotr Matusiak
CCIE #19860 (R&S, SEC)
Technical Instructor
MicronicsTraining.com
If you can't explain it simply, you don't understand it well enough -
Albert Einstein
2009/11/9 Tomasz Solski <tom.solski_at_gmail.com>
> How to filter external OSPF routes from database ?
>
> Here is an example:
>
> R1------Ar0------R2------Ar1-------R3
>
> R1 redistributes routes into Area 0.
>
> I want ot configure R2 so R3 does not have a specific external route in its
> database.
>
> I tried on R2:
> <<<
> ip prefix-list R1toR3 seq 5 deny 1.1.12.0/24
> ip prefix-list R1toR3 seq 10 permit 0.0.0.0/0 le 32
> router ospf 1
>  area 1 filter-list prefix R1toR3 in
> >>>
>
> but it looks like external routes can not be filtered with filter list. As
> soon as I advertise 1.1.12.0/24 on R1, instead of redistributing it, it
> disappears from R3's database and routing table.
>
>
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