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In-Reply-To: <4A8FF80D.4020103@webjogger.net> Date: Sat, 22 Aug 2009 12:08:52 -0700 From: Hector Herrera <hectorherrera@gmail.com> To: Adam Greene <maillist@webjogger.net> Cc: NANOG list <nanog@nanog.org> Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org On Sat, Aug 22, 2009 at 6:52 AM, Adam Greene<maillist@webjogger.net> wrote: > Another option could be to announce one /17 to each upstream provider and > use conditional BGP to announce the other /17 to the provider that's still > active in the event that one provider goes down. > Maybe I'm wrong, but I think this method will only work when handling local failures. If there is a failure in a remote network which causes ISP A to be unreachable from a third party, your routers will not adjust the announcements since ISP A and B are still reachable to you, but the third party will not be able to reach the network nearer to ISP A through the ISP B connection because ISP B doesn't have an announcement to that network. (This is assuming that ISP A and ISP B are not peers). Hector
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