nanog mailing list archives
Re: local_preference for transit traffic?
From: Joe Malcolm <jmalcolm () uraeus com>
Date: Thu, 15 Dec 2011 21:02:33 +0000
Jeff Wheeler writes:
On Thu, Dec 15, 2011 at 1:07 AM, Keegan Holley <keegan.holley () sungard com> wrote:Had in interesting conversation with a transit AS on behalf of a customer where I found out they are using communities to raise the local preferenceThat sounds like a disreputable practice. While not quite as obvious, some large transit ASes, like Level3, reset the origin to I (best) sometime between when they learn it and when they announce it to their customers and peers. This similarly causes them to suck in a bit more traffic than they might otherwise.
Once upon a time, UUNET did the opposite by setting origin to unknown for peer routes, in an attempt to prefer customer routes over peer routes. We moved to local preference shortly thereafter as it became clear this was "changing" the routes in some meaningful way; if a customer was multihomed to us and another provider, this might affect path selection. (The original thought was that local pref might be too heavyweight, but of course later it became the standard.) Joe
Current thread:
- local_preference for transit traffic? Keegan Holley (Dec 14)
- RE: local_preference for transit traffic? Holmes,David A (Dec 14)
- Re: local_preference for transit traffic? Keegan Holley (Dec 14)
- Re: local_preference for transit traffic? Jeff Wheeler (Dec 14)
- Re: local_preference for transit traffic? Keegan Holley (Dec 14)
- Re: local_preference for transit traffic? Jeff Wheeler (Dec 14)
- Re: local_preference for transit traffic? Leo Bicknell (Dec 15)
- Re: local_preference for transit traffic? Mark Tinka (Dec 15)
- Re: local_preference for transit traffic? Keegan Holley (Dec 15)
- Re: local_preference for transit traffic? Mark Tinka (Dec 15)
- Re: local_preference for transit traffic? Keegan Holley (Dec 14)
- RE: local_preference for transit traffic? Holmes,David A (Dec 14)
- Re: local_preference for transit traffic? Mark Tinka (Dec 17)
- Re: local_preference for transit traffic? Matthew Petach (Dec 17)
- Re: local_preference for transit traffic? Adam Rothschild (Dec 17)
- Re: local_preference for transit traffic? Mark Tinka (Dec 18)