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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: AS 701 local-pref answer.
> Date: Sun, 16 Dec 2001 17:28:30 -0800 (PST) > From: David Barak <[email protected]> > AS 701 always announces the best route, as their > routers know it. Their average AS-path length is This is silly. Local-pref is one of the methods by which a router learns the "best route". The question was: If not by local-pref, then by what? > under 2, so it doesn't seem to be a problem. If a And if someone pads their adverts to 701 at their egress? Suddenly the "best route" to the downstream is via the peer. Sorry, it doesn't matter if "average as-path length is under 2" or not... the point is that (unless BGP weight comes into play), after reachability, as-path length is the first route selection mechanism after reachability. > customer of AS 701 wants to insure that his/her route > is advertised in all cases, s/he could send a > community which AS701 edge devices could use to > manipulate local-preference upward. [this was covered IOW, the bottom line answer is: reliance on as-path length, but local-pref is tunable via communities. Eddy --------------------------------------------------------------------------- Brotsman & Dreger, Inc. - EverQuick Internet Division Phone: +1 (316) 794-8922 Wichita/(Inter)national Phone: +1 (785) 865-5885 Lawrence --------------------------------------------------------------------------- Date: Mon, 21 May 2001 11:23:58 +0000 (GMT) From: A Trap <[email protected]> To: [email protected] Subject: Please ignore this portion of my mail signature. These last few lines are a trap for address-harvesting spambots. Do NOT send mail to <[email protected]>, or you are likely to be blocked.
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