AS path question.

Wed Nov 10 23:44:33 UTC 2010

--- Valdis.Kletnieks at vt.edu wrote:
From: Valdis.Kletnieks at vt.edu

One has to wonder how many places are using the prepend-me-harder
commands to do traffic engineering, and have absolutely no clue that
their prepends are having the opposite effect because the prefix is
being dropped entirely by some AS's.
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Do you think (or is there evidence) that very many ASs use maxas-limit type commands?  I have never used it and never had any problems...

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I suppose the exact same issue applies for those places that deaggregate
in an attempt to to TE, and the de-aggregated prefixes get munched by
somebody's prefix-length filter.
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Only if they're longer than a /24, though; yes?  I imagine no one really filters shorter than a /24 these days.

scott