[j-nsp] AS-path regexp clue needed

[Paul Goyette]

To the best of my knowledge, Juniper does not implement the
back-reference in AS-path regular expressions.  Therefore there
is no direct translation available.

You should discuss the need for this with your account team, as
an Enhancement Request.


> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net [mailto:juniper-nsp-
> bounces at puck.nether.net] On Behalf Of KJ
> Sent: Thursday, July 29, 2010 5:46 AM
> To: Daniel Verlouw
> Cc: Juniper-Nsp
> Subject: Re: [j-nsp] AS-path regexp clue needed
> 
> Take a look here:
> 
> http://www.juniper.net/techpubs/software/junos/junos74/swconfig74-
> policy/html/policy-extend-match-config3.html
> <http://www.juniper.net/techpubs/software/junos/junos74/swconfig74-
> policy/html/policy-extend-match-config3.html>
> 
> On 29 July 2010 14:18, Daniel Verlouw <daniel at bit.nl> wrote:
> 
> > Hi,
> >
> > can someone give me some clue on how to translate the following Cisco
> > regexp to Junos ?
> >
> > ip as-path access-list 1 permit ^([0-9]+)(_\1)*$
> >
> > (this uses pattern recall to match AS paths whose first AS number in
> the
> > path is repeated zero or more times; basically to make sure certain
> > customers prepend their own AS number only).
> >
> > IOS-to-Junos translator is unable to parse this and JTAC, well, let's
> > just say they don't seem to get it -at all-.
> >
> > Of course, I could write a regexp per customer, but obviously this
> > doesn't scale very well.
> >
> >  --Daniel.
> >
> > _______________________________________________
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> >
> 
> 
> 
> --
> //kjwilki
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