Re: Ospf lsa filtering command.

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

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