[74027] in North American Network Operators' Group
Re: ISP Policies
daemon@ATHENA.MIT.EDU (Edward B. Dreger)
Sun Sep 12 13:49:06 2004
Date: Sun, 12 Sep 2004 17:47:34 +0000 (GMT)
From: "Edward B. Dreger" <eddy+public+spam@noc.everquick.net>
To: nanog@merit.edu
In-Reply-To: <200409100537.LAA21994@WS0005.indiatimes.com>
Errors-To: owner-nanog-outgoing@merit.edu
RG> Date: Fri, 10 Sep 2004 11:36:58 +0530
RG> From: Rohit Gupta
RG> On a related note : Do ISPs ever tweak around with Local
RG> Prefs and weights so as to select BGP paths with greater AS
RG> PATH length?
Definitely. Case in point: I set up a network a few years ago
that included a choice between
X 1
Y Z 1
and the latter, longer AS_PATH was the lower-latency way to reach
most of AS1. A side bonus was that traffic distribution between
their upstreams was better.
Note that, as others have mentioned, such tweaks are more common
on smaller providers that have less splay.
RG> Would it ever make sense for a provider to chose a longer AS
RG> PATH length BGP route against a shorter AS PATH length route?
Yes. See above. Not all AS_PATH hops are created equal, just as
not all IP hops are created equal.
Eddy
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