Re: Ospf lsa filtering command.

Good comments on that ...

I had a lab and it said " the 10/8 network should not come into are 6". I
used that command on the ABRs to filter these routes and keep that network
out of area 6.

Nice comments!

On Tue, Jun 2, 2009 at 9:56 PM, Piyoush Sharma <piyoush_at_gmail.com> wrote:

> For any LSA filtering (of a specific network type) you can use area filter
> command, when the routes are flooded into another area (in backbone area
> from, say, area 2). This filter can be applied inbound or outbound, based on
> the requirements.
>
> Piyoush
>
>
> On Tue, Jun 2, 2009 at 12:31 PM, Andy Hogard <andyhogard_at_gmail.com> wrote:
>
>> Thanks a lot! Will sit on it in some time. :)
>>
>> On Wed, Jun 3, 2009 at 12:35 AM, ALL From_NJ <all.from.nj_at_gmail.com>
>> wrote:
>>
>> > Here is the doc cd in which it describes when you might use this command
>> > (watch the ugly word wrap)
>> >
>> >
>> >
>>
>> http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ospf_cfg_
>> ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1054763<http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ospf_cfg_%0Aps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1054763>
>> >
>> > From this link:
>> >
>> > You can block OSPF flooding of LSAs two ways, depending on the type of
>> > networks:
>> >
>> > On broadcast, nonbroadcast, and point-to-point networks, you can block
>> > flooding over specified OSPF interfaces.
>> >
>> > On point-to-multipoint networks, you can block flooding to a specified
>> > neighbor.
>> >
>> > So the command you would use would depend on the interface type and what
>> > you are trying to do.
>> >
>> > I saw a caveat related to testing this feature, and this was that I
>> > sometimes needed to manually clear the OSPF process on the spoke router,
>> > even if the router had bounced the neigh relationship itself, it still
>> would
>> > required a clear from me.
>> >
>> > Seems to me this is a command to use for your spokes where they have
>> only
>> > one path. I note of caution for this ... if using this towards your
>> spokes,
>> > this command also blocks a default route LSA that you may be using for a
>> > default route. HTH,
>> >
>> > Andrew Lee Lissitz
>> >
>> >
>> >
>> > On Tue, Jun 2, 2009 at 2:15 PM, Andy Hogard <andyhogard_at_gmail.com>
>> wrote:
>> >
>> >> Also, it works under the network type of "point-to-multipoint
>> >> non-broadcast"
>> >> as it requires the neighbor command as well!
>> >>
>> >> :)
>> >>
>> >> On Tue, Jun 2, 2009 at 11:39 PM, Andy Hogard <andyhogard_at_gmail.com>
>> >> wrote:
>> >>
>> >> > Arg!!
>> >> >
>> >> > "R2#conf t
>> >> > Enter configuration commands, one per line. End with CNTL/Z.
>> >> > R2(config)#router ospf 1
>> >> > R2(config-router)#neighbor 131.1.23.3 database-filter all out
>> >> > OSPF: Neighbor command is allowed only on NBMA and
>> point-to-multipoint
>> >> > networks
>> >> > R2(config-router)#"
>> >> >
>> >> > Got it!! :D
>> >> >
>> >> > On Tue, Jun 2, 2009 at 11:30 PM, Andy Hogard <andyhogard_at_gmail.com>
>> >> wrote:
>> >> >
>> >> >> Hi,
>> >> >>
>> >> >>
>> >> >> Was wondering ..with what ospf network types does, "neighbor
>> 131.1.23.3
>> >> >> database-filter all out" command work?! Are there any caveats to
>> watch
>> >> out
>> >> >> for, eh?
>> >> >>
>> >> >>
>> >> >> Greets,
>> >> >> Andy H.
>> >> >>
>> >> >> --
>> >> >> My Blog URL: http://ccielog.blogspot.com/
>> >> >>
>> >> >
>> >> >
>> >> >
>> >> > --
>> >> > My Blog URL: http://ccielog.blogspot.com/
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> My Blog URL: http://ccielog.blogspot.com/
>> >>
>> >>
>> >> Blogs and organic groups at http://www.ccie.net
>> >>
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>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> > --
>> > Andrew Lee Lissitz
>> > all.from.nj_at_gmail.com
>> >
>>
>>
>>
>> --
>> My Blog URL: http://ccielog.blogspot.com/
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
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>>
>

-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net