[j-nsp] as-path-prepend-nerf

[E.T.Metz at telecom.tno.nl]

I dont think it is actually allowed to modify received AS-PATHs like that (per the BGP spec). 

> -----Original Message-----
> From: Jeff Wheeler [mailto:jeff at reflected.net]
> Sent: vrijdag 19 maart 2004 8:51
> To: juniper-nsp at puck.nether.net
> Subject: [j-nsp] as-path-prepend-nerf
> 
> 
> This may sound stupid at first, but for years I have wondered why
> vendors don't offer the ability to condense as-path prepending seen on
> learnt routes.  For example, I learn..:
>                       AS path: 4436 8001 27257 27257 27257 27257 I
> 
> I'd like to set as-path-prepend-nerf 1 and allow unique ASNs to appear
> only once consecutively in a learnt path.  The action 
> performed would be
> to convert the above path to "4436 8001 27257 I."  Is this 
> crazy?  I do
> not see how this action could introduce loops.
> 
> It'd be nice to have a way to match prepending of various degrees as
> well, for example if I saw the same AS repeated N times in a path, I
> might care to tweak my local-preference down on that path.  I 
> don't know
> how to do this using today's tools (is it possible).  With JunOS
> add/subtract to local-pref, this would be a nice feature addition.
> 
> -- 
> Jeff at Reflected Networks
> 
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