From: IceFire (Fire_Ice@verizon.net)
Date: Thu Feb 02 2006 - 18:13:36 GMT-3
That is correct directly connected means just one extra AS.
AS200 and AS300 aren't peered with AS254 so they aren't directly connected.
I believe the reg expression is correct also.
Thanks
IceFire
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Geert Nijs
Sent: Thursday, February 02, 2006 4:09 PM
To: Nadeem Zahid (iszahid); ccielab@groupstudy.com
Subject: RE: BGP Filter Question
Directly connected is just with one AS extra
so indeed
AS= 254 and any single number
If i remember correctly it should be something like:
^254_([0-9]*)$
correct me if i am wrong
Geert
CCIE #13729
-----Oorspronkelijk bericht-----
Van: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Namens Nadeem
Zahid (iszahid)
Verzonden: donderdag 2 februari 2006 20:15
Aan: ccielab@groupstudy.com
Onderwerp: BGP Filter Question
What is considered "directly connected customer" in case of BGP?
Let say R1 is receiving some prefixes from 2 nbrs:
1.1.1.1 AS path= 254 100 200 300
2.2.2.2 AS path= 254 50
Let say we wanna only allow AS 254 and its directly connected customers
- does it mean that it should
be only 1 AS behind 254 (like 1 hop)?
I see examples permitting ^254(_[0-9])*$ which is not correct IMO as it
will allow any numbers of ASs behind 254.
Nadeem
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