Re: Lots of prepends - AS20912 case

[Dorn Hetzel <dhetzel () gmail com>]

Replacing what is conventially thought to be a string with an integer
multiplier seems a massive violation of the principle of least astonishment.

On Fri, Feb 20, 2009 at 8:00 AM, Jon Lewis <jlewis () lewis org> wrote:

> On Fri, 20 Feb 2009, Giuliano Peritore wrote:
>
>        The problem is that differently to Cisco the syntax of the prepend
> > field on thius system is not a string (eg. "20912 20912 20912") but an
> > integer, that the user interface _should_ limit to the interval 0-16.
> ...
>
> >       The producer has been warned about the problem, which I can't
> > completely define as a "bug"... but the lack of a user configuration helper
> > (syntax checker).
>
> More important than whether or not to consider this a bug, it seems a very
> shortsighted way to support prepending.  If your prepend "field" is an
> integer controlling how many times to prepend, how do you control which
> ASN(s) or even AS Paths are prepended?  It sounds like you probably can't.
> As has been discussed recently, there are cases where you might want to
> prepend a creative AS Path for traffic engineering purposes to force certain
> routes/paths to be ignored by certain ASNs.
>
> ----------------------------------------------------------------------
>  Jon Lewis                   |  I route
>  Senior Network Engineer     |  therefore you are
>  Atlantic Net                |
> _________ http://www.lewis.org/~jlewis/pgp<http://www.lewis.org/%7Ejlewis/pgp>for PGP public key_________