nanog mailing list archives
RE: AS path question.
From: "Stefan Fouant" <sfouant () shortestpathfirst net>
Date: Wed, 10 Nov 2010 15:44:08 -0500
-----Original Message----- From: Jared Mauch [mailto:jared () puck nether net] Sent: Wednesday, November 10, 2010 3:31 PM To: Greg Whynott Cc: nanog () nanog org list Subject: Re: AS path question. People prepend, and think 'more is better' vs using communities and other 'complex' methods of managing their traffic. It's also the easy tool from the shed. 'set as-path prepend blah' is easier than
In this day and age, I'm still surprised at how many people think AS Path prepending is the preferred way to influence inbound traffic paths. As many providers have default local-pref policies in place which prefer routes learned from the customer over routes learned from another peer, it is often the case that a supposed secondary path is actual the preferred path from the view of that upstream provider. IMO, a combination of both community tagging to influence localpref coupled with AS Path prepending on the secondary link is the best approach, and seems to accommodate both steady state as well as failure scenarios properly. Stefan Fouant
Current thread:
- AS path question. Greg Whynott (Nov 10)
- Re: AS path question. Jared Mauch (Nov 10)
- RE: AS path question. Stefan Fouant (Nov 10)
- Re: AS path question. Joe Maimon (Nov 10)
- Re: AS path question. Stefan Fouant (Nov 10)
- Re: AS path question. Jack Bates (Nov 10)
- RE: AS path question. Stefan Fouant (Nov 10)
- Re: AS path question. Valdis . Kletnieks (Nov 10)
- Re: AS path question. Jared Mauch (Nov 10)
- Re: AS path question. Justin M. Streiner (Nov 10)
- RE: AS path question. Holmes,David A (Nov 10)
- <Possible follow-ups>
- re: AS path question. Nick Olsen (Nov 10)
- Re: AS path question. Greg Whynott (Nov 10)
- RE: AS path question. Stefan Fouant (Nov 10)
- Re: AS path question. John Osmon (Nov 10)
- Re: AS path question. Greg Whynott (Nov 10)