nanog mailing list archives
Easy and hard multihoming (was: Re: Upstreams blocking /24s)
From: David Barak <thegameiam () yahoo com>
Date: Wed, 10 Oct 2007 11:01:19 -0700 (PDT)
--- Keegan.Holley () sungard com wrote:
So if one of the Tier I's decides not to accept my public /29 then the millions of singlehomed subscribers go with it.
Yep. During normal operation, someone would be announcing the aggregate out of which your /29 is carved, and that provider should be someone you're paying to carry the more-specific. Traffic will get to you in that case. If your circuit to that provider goes down, then the other customers of your other provider will be able to reach you, but the peers and suppliers of your other provider would likely not. The easiest way to multihome in a way which mostly works (tm) is to get an ASN and self-originate a prefix which is /24 or larger. As of right now, multihoming is a justification for a /24 and an ASN, so multihoming in a different way should be something which is done for a specific reason, or to solve a particular problem. Yes, yes, there are multiple other ways to do this, but their failure modes might not be as easy for your providers to help you troubleshoot as BGP is. -David David Barak Need Geek Rock? Try The Franchise: http://www.listentothefranchise.com ____________________________________________________________________________________ Need a vacation? Get great deals to amazing places on Yahoo! Travel. http://travel.yahoo.com/
Current thread:
- Re: How Not to Multihome, (continued)
- Re: How Not to Multihome Andy Davidson (Oct 09)
- Re: How Not to Multihome Scott Weeks (Oct 08)
- Upstreams blocking /24s? (was Re: How Not to Multihome) David Conrad (Oct 08)
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) Steven M. Bellovin (Oct 08)
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) Justin M. Streiner (Oct 08)
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) Jon Lewis (Oct 08)
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) Justin M. Streiner (Oct 08)
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) David Conrad (Oct 08)
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) Patrick W. Gilmore (Oct 08)
- Re: Upstreams blocking /24s? (was Re: How Not to Multihome) Keegan . Holley (Oct 09)
- Easy and hard multihoming (was: Re: Upstreams blocking /24s) David Barak (Oct 10)
- Upstreams blocking /24s? (was Re: How Not to Multihome) David Conrad (Oct 08)