[j-nsp] Filtering OSPF routes

[Lars Erik Gullerud]

Well no, IOS also allows you to configure a route-map to block OSPF
routes from being added to the routing-table, matching on any OSPF
attributes. This will not help the original poster, since LSAs are still
flooded normally and its his M5 he wanted to block the routes on. With
this IOS feature, routes are only filtered from the RIB on the local
router, but I believe what he was looking for was a similar feature in
JunOS, which would probably be preferable to filtering the LSAs on the
remote (Cisco) side.

I've never tried this feature myself, but Cisco calls this "OSPF Route
Map-based filtering" and it's available in 12.0S trains. I guess it
would correspond to an import filter in JunOS, which you can not set for
OSPF.

/leg

On Tue, 2003-02-18 at 18:31, Kent Yu wrote:
> IOS only allows filtering type-3 at ABR, I think the original poster's
> intend was to filter LSA within the same area.
> 
> The feature could be useful for enterprise networks, do not think it is
> helpful for the SPs.
> 
> Thanks
> --kent
> ----- Original Message -----
> From: "Wayne (juniper nsp)" <wg-jnpr-nsp at wgustavus.com>
> To: "Ben Buxton" <B.Buxton at Planettechnologies.nl>; "Ajay Bhardwaj"
> <ajay.bhardwaj at in.spectranet.com>; <juniper-nsp at puck.nether.net>
> Sent: Saturday, February 15, 2003 11:42 PM
> Subject: Re: [j-nsp] Filtering OSPF routes
> 
> 
> MessageActually, if you are running a sufficiently high enough version of
> IOS (e.g. 12.0S), the 7200 can filter some LSAs.  It depends on your exact
> scenario if this will accomplish what you are trying to do.  It does tend to
> go contrary to the design of OSPF (or any link state protocol), but I
> suppose enough people wanted the knob, so they got it.
> 
> Not sure if JUNOS has a similar knob.
> 
> - Wayne
>   ----- Original Message -----
>   From: Ben Buxton
>   To: Ajay Bhardwaj ; juniper-nsp at puck.nether.net
>   Sent: Monday, February 10, 2003 4:18 AM
>   Subject: RE: [j-nsp] Filtering OSPF routes
> 
> 
> 
>   You cannot filter OSPF. This would break the requirement that all routers
> have
>   the same link state view.
>   This is true for both Junos and IOS.
> 
>   BB
>     -----Original Message-----
>     From: Ajay Bhardwaj [mailto:ajay.bhardwaj at in.spectranet.com]
>     Sent: Monday, 10 February 2003 08:39
>     To: juniper-nsp at puck.nether.net
>     Subject: [j-nsp] Filtering OSPF routes
> 
> 
>     Hi all,
> 
>     We have cisco 7200 router and M-5 router both running ospf and part of
> area 10.
> 
>     I want to deny few routes which are flowing trough ospf from 7200 to m5
> either at 7200 side or m5 side. Pls if anyone have any solution to this
> would be gr8 help for me.
> 
>     Ajay Bhardwaj
> 
> 
> 
> ----------------------------------------------------------------------------
> --
> 
> 
>   _______________________________________________
>   juniper-nsp mailing list juniper-nsp at puck.nether.net
>   http://puck.nether.net/mailman/listinfo/juniper-nsp
> 
> 
> 
> ----------------------------------------------------------------------------
> ----
> 
> 
> > _______________________________________________
> > juniper-nsp mailing list juniper-nsp at puck.nether.net
> > http://puck.nether.net/mailman/listinfo/juniper-nsp
> >
> 
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> http://puck.nether.net/mailman/listinfo/juniper-nsp