Another solution to that is ask your ISPs to get default routes from their upstreams and pass it to you and not to use default-originate. So if any ISP lost its links with its upstreams your default route will be automatically disappeared.
-sumon On Fri, Dec 12, 2008 at 11:02 PM, <[email protected]> wrote: > That sounds like a good idea. Thank you very much. > > What do you think of using conditional advertisement based on their > Route Reflector to advertise a default route? (I think the biggest > problem is that most ISPs might not want to do that correct?) > > Thank you again. > > > Tom > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Saku Ytti > Sent: Friday, December 12, 2008 10:42 AM > To: [email protected] > Subject: Re: [c-nsp] Detect Upstream ISP's BGP problems. > > On (2008-12-12 09:57 -0600), [email protected] wrote: > > > I know I could ask the ISPs to provide me a core route and use > > conditional advertisement, which would work well for traffic coming > > inbound, but what about outbound? How can I make the default route > > disappear from an ISP that is having internal problems. > > Don't get default, get PA aggregate. And point static route to that PA > aggregate and the interface. If ISPs peering router is separated from > ISPs core, the PA aggregate disappears and static default will be > invalid, allowing you to converge to another path. > > For more advanced stuff, you might want to look at 'PfR' > from cisco. > > -- > ++ytti > _______________________________________________ > 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/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
