AS path regular expressions extension to ripe 181

Curtis Villamizar (curtis at ans.net) on June 13:
> 
> In message <9506132119.AA03624 at class.engeast>, Marten Terpstra writes:
> > 
> > 
> >  * The following three <extended routing policy expression> represent the sam
> > e
> >  * set of routes, however the last one can be translated into a finte state
> >  * 
> >  *                                      4
> >  * 
> >  * automota much more efficiently than the second one, and the second one can
> >  * be translated much more efficiently than the first one:
> >  * 
> >  *   o <^AS1> OR < ^AS2> OR < ^AS3>
> >  * 
> >  *   o <^(AS1 | AS2 | AS3)>
> >  * 
> >  *   o <^[AS1 AS2 AS3]>
> >  * 
> >  * We recommend the use of the last form whenever possible.
> > 
> > Hmm, I would have picked another example here. On a specific peer, I
> > cannot see how accepting routes with a path that starts with 3
> > different ASes can be useful. The path will always start with the
> > neighbor AS (unless you fiddle with the path of course). The example
> > would have made more sense (to me at least) if you would have used
> > 
> > <AS1$> OR <AS2$> OR <AS3$> -> <(AS1 | AS2 | AS3)$> -> <[AS1 AS2 AS3]$>
> > 
> > -Marten
> 
> 
> Cengiz,
> 
> Nice work.

Thanks.

> 
> Marten,
> 
> This example makes a lot more sense on an extended-as-out line.  In
> fact it looks really familiar for some reason.  Spooky isn't it.  :-)
> 
> Curtis
> 
> ps - try "whois -h figaro.ans.net -s anstest as690".  After reading
> the above (Cenzig's original note), I need to add a lot of as-out
> lines with "ANY" to allow tools that don't understand this to get the
> approximation Cengiz referred to.  This is a really big object, so
> don't hold your breath after you type the whois command.
> 
> pps- I used ei, eo, ie, oe, for extended-as-in, extended-as-out,
> extended-interas-in, extended-interas-out in the RIPE conf file.  Did
> anyone else chose differently?  Or did I miss this in the document?

RADB is using the following:
ATTR    xa      extended-as-in  
ATTR    xb      extended-as-out
ATTR    xc      extended-interas-in
ATTR    xd      extended-interas-out

I will add these short names to the document. Curtis can you please
change the short names you chose (we may have someone else's data)?
Sorry about the inconvenience and thanks.

Brian Renaud upgraded ripe's syntax checker (syntax.pl) to handle the
extended attributes. Brian, could you make your changes public for the
other registries that are interested?  Thanks.

Cengiz

-- 
Cengiz Alaettinoglu       Information Sciences Institute
(310) 822-1511            University of Southern California
http://www.isi.edu/div7/people/cengiz.home



-------- Logged at  Thu Jun 15 20:46:45 MET DST 1995  ---------