Are you running BFD on the link as well? On Thu, Nov 30, 2023 at 8:33 AM Drew Weaver via cisco-nsp < [email protected]> wrote:
> Can you point me towards a hint on how you implement import/export filters > in OSPF on IOS XR? > > Are you referring to 'distribute lists'? > > Another thing that is a bit quirky from my standpoint is why when the > remote router gets knocked offline BFD on the OSPF process doesn't kill the > route immediately. > > It seems like it takes 15-20 seconds for the route to be removed entirely > from OSPF from when the transport goes down. > > Thanks, > -Drew > > > > > -----Original Message----- > From: cisco-nsp <[email protected]> On Behalf Of Mark > Tinka via cisco-nsp > Sent: Tuesday, November 28, 2023 10:34 AM > To: [email protected] > Subject: Re: [c-nsp] IOS XR filter route from OSPF? > > > > On 11/28/23 17:02, Nick Hilliard via cisco-nsp wrote: > > > > > prefix filtering is a defining feature of a policy routing protocol. > > OSPF is a link-state protocol, and doesn't support the concept of > > having different visibility of prefixes inside the same area. If you > > want that with OSPF, you'll need to divide your network into different > > areas, which is messy. Probably better off using bgp for this. > > Filtering in link state routing protocols is a bit of a misnomer, > technically speaking... but, you can use import/export filters on routers > with OSPF and IS-IS. > > It would not necessarily limit the LSA/LSP flooding scope, but you end up > with the desired outcome (all manner of caveats apply). > > All that said, the usefulness of an IGP is in its homogeneous view of the > network from and by all participating nodes. Bad things can happen when one > partitions IGP's, especially in an unintended way. As you say, BGP is > better for this kind of thing, as typically, IGP's should carry > infrastructure prefixes, and you don't really want to filter those as they > provide basic router-to-router connectivity. > > Mark. > _______________________________________________ > cisco-nsp mailing list [email protected] > https://urldefense.proofpoint.com/v2/url?u=https-3A__puck.nether.net_mailman_listinfo_cisco-2Dnsp&d=DwIGaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=OPufM5oSy-PFpzfoijO_w76wskMALE1o4LtA3tMGmuw&m=vULDC6NcfEryzxgZJwBX01MI1hvcl6imhD3JeJk-APbysS6EeiyW2iYo-iNe2hyv&s=bxKox8AZsSqTO0SucoYYO20srO8SW3Ewq1Ip_709ASQ&e= > archive at > https://urldefense.proofpoint.com/v2/url?u=http-3A__puck.nether.net_pipermail_cisco-2Dnsp_&d=DwIGaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=OPufM5oSy-PFpzfoijO_w76wskMALE1o4LtA3tMGmuw&m=vULDC6NcfEryzxgZJwBX01MI1hvcl6imhD3JeJk-APbysS6EeiyW2iYo-iNe2hyv&s=5zW-HHWMmy0AUPIFDaod5TRgutJC7tKZzMTyflG8bS0&e= > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
