nanog mailing list archives
Re: Redundancy & Summarization
From: Hector Herrera <hectorherrera () gmail com>
Date: Sat, 22 Aug 2009 12:08:52 -0700
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
Current thread:
- Redundancy & Summarization Gaynor, Jonathan (Aug 21)
- RE: Redundancy & Summarization Harper, Jeff (Aug 21)
- Re: Redundancy & Summarization Grzegorz Janoszka (Aug 21)
- Re: Redundancy & Summarization Jack Bates (Aug 21)
- <Possible follow-ups>
- Re: Redundancy & Summarization Brian Dickson (Aug 21)
- Re: Redundancy & Summarization Patrick W. Gilmore (Aug 21)
- Re: Redundancy & Summarization Adam Greene (Aug 22)
- Re: Redundancy & Summarization Patrick W. Gilmore (Aug 22)
- Re: Redundancy & Summarization Hector Herrera (Aug 22)
- Re: Redundancy & Summarization Patrick W. Gilmore (Aug 21)