Re: How to filter external OSPF routes from database ?

Guys/Ladies, if you are interested, i will finish the OSPF FIltering
VOD by the end of next week (Or Before) it will cover every possible
filtering mechanism possible in OSPF.

On Tue, Nov 10, 2009 at 1:21 PM, Miroslav Kosut
<miroslav.kosut_at_gmail.com> wrote:
> Stubby area :-)
>
> External LSAs (LSA5) can be filtered on ASBRs using summary-address NET MASK
> not-advertise. I don't know about any other way of filtering them on ABRs
> except using stubby areas.
>
> Regards,
> Miroslav
>
> On Nov 10, 2009, at 10:15 PM, Martin Hogan wrote:
>
>> What does the Cisco Doc tell you about that command?
>>
>> Hint: It's only effective on a particular LSA type.
>>
>>
>>
>> On Tue, Nov 10, 2009 at 7:44 AM, Tomasz Solski <tom.solski_at_gmail.com>
>> wrote:
>>
>>> 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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