From: ying chang (ying_c@xxxxxxxxxxx)
Date: Wed Apr 03 2002 - 23:45:06 GMT-3
"_" is a tricky one, it matches ^, $, (, ), {, }, " ", ",", or "_". That
means it will covers ^300$, ^300_, _300$ and _300_.
Chang
>From: "Manny Gonzalez" <gonzalu@nyp.org>
>Reply-To: "Manny Gonzalez" <gonzalu@nyp.org>
>To: Ahmed Mamoor Amimi <mamoor@ieee.org>
>CC: ccielab@groupstudy.com
>Subject: Re: BGP AS-PATH
>Date: Wed, 03 Apr 2002 18:15:15 -0500
>
>Well, all look okay except:
>
> > ^300$ = orignating from 300
>
>I believe this actually means from the CONNECTED AS 300, not ORIGINATED
>from there... for ORIGINATED in AS300 I believe you would do
>
>_300$
>
>The other one is
>
> > ^300 200$ = routes from AS 300 and 200 or 200 and 300
>
>I believe you also have this one incorrectly interpreted. I believe it
>actually means that the PATH MUST BE 300 200 in exactly that order. For
>200 300 you would need ^200 300$. I believe it is a literal expresion.
>
>If I am wrong I will be corrected soon enough.
>
>Also, I would be careful with your interpretation of forward or
>backwards paths... Let's say we stay on the same ballpark and use common
>terminology. I prefer the term ORIGINATE and TRANSIT and CONNECTED as
>descriptive terms in an as-path. We all agree that the origin is at the
>righ hand side of the string and the connected AS is always on the left
>hand side of the string... etc. etc. :-))
>
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