Re: How to filter external OSPF routes from database ?

My appologies, I was thinking abt distribute-list out.

On Tue, Nov 10, 2009 at 10:19 PM, S Malik <ccie.09_at_gmail.com> wrote:

> summ-add should work for LSA 5&7. in your case. R2 is converting LSA 7 into
> LSA 5.
>
>
> On Tue, Nov 10, 2009 at 7:27 PM, Tom Solski <tom.solski_at_gmail.com> wrote:
>
>> Thanks Miroslav. Summary address on R2 works if area 1 is configured as
>> not
>> so stubby (NSSA). I am referring to this topology:
>>
>> R1------area1-----R2-----area0------R3--------area2--------R4
>> R1 redistributes external 1.0.0.0/8 into area1.
>>
>> IOS appears to me really inconsistent here. Why summary-address works for
>> N2
>> routes and does not for E2 routes?
>>
>>
>> -----Original Message-----
>> From: Miroslav Kosut [mailto:miroslav.kosut_at_gmail.com]
>> Sent: 10-Nov-09 16:22
>> To: Tomasz Solski
>> Cc: Cisco certification
>> Subject: Re: How to filter external OSPF routes from database ?
>>
>> 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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Received on Tue Nov 10 2009 - 22:20:56 ART