Re: BGP AS-PATH

From: Manny Gonzalez (gonzalu@xxxxxxx)
Date: Wed Apr 03 2002 - 20:15:15 GMT-3


   
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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