nanog mailing list archives
RE: Multi site BGP Routing design
From: "Ivan Pepelnjak" <ip () ioshints info>
Date: Sat, 6 Jun 2009 09:40:20 +0200
To rephrase the OP's question, would it be BCP to acquire a second ASN, and without further de-aggregating, continue advertising each site's IP space to the DFZ, but from dissimilar ASs as opposed to the same one?
This would definitely be the best approach. You're not introducing new IP prefixes and you're not extending AS paths, so the net effect on the global BGP routing is zero (OK, you might have to use the 4 byte AS number :). Just make sure that both ISPs you connect to allow you to advertise "transit" prefixes. If site A public link goes down, but the private link is up, site B will advertise its own address space plus site A's address space with an extra AS number in the AS path (and the upstream ISP might filter that). Ivan http://www.ioshints.info/about http://blog.ioshints.info/
Current thread:
- Multi site BGP Routing design Justin Krejci (Jun 05)
- Re: Multi site BGP Routing design Steve Bertrand (Jun 05)
- Re: Multi site BGP Routing design Chris Adams (Jun 05)
- RE: Multi site BGP Routing design John.Herbert (Jun 05)
- Re: Multi site BGP Routing design Steve Bertrand (Jun 05)
- RE: Multi site BGP Routing design John.Herbert (Jun 05)
- Re: Multi site BGP Routing design Chris Adams (Jun 05)
- Re: Multi site BGP Routing design Steve Bertrand (Jun 05)
- Re: Multi site BGP Routing design Michael K. Smith (Jun 05)
- Re: Multi site BGP Routing design Steve Bertrand (Jun 05)
- RE: Multi site BGP Routing design Ivan Pepelnjak (Jun 06)
- Re: Multi site BGP Routing design Saqib Ilyas (Jun 06)
- Re: Multi site BGP Routing design Adam Greene (Jun 06)
- RE: Multi site BGP Routing design Justin Krejci (Jun 08)
- RE: Multi site BGP Routing design Ivan Pepelnjak (Jun 09)
- Re: Multi site BGP Routing design Steve Bertrand (Jun 05)
- RE: Multi site BGP Routing design John.Herbert (Jun 05)
- Re: Multi site BGP Routing design Chuck Anderson (Jun 05)
- Re: Multi site BGP Routing design Steve Bertrand (Jun 05)
- Re: Multi site BGP Routing design Randy Bush (Jun 05)