Re: Ospf lsa filtering command.

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/
> >>
> >>
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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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Received on Tue Jun 02 2009 - 18:56:11 ART