From: Colin Barber (Colin.Barber@xxxxxxxxxxxxxx)
Date: Sun Aug 25 2002 - 11:07:42 GMT-3
MED is sent from as AS (on your case AS1) into another AS (AS2). The MED is
transferred between routers within AS2 (IBGP neighbors) but is not sent on
to any EBGP neighbors. Therefore both your scenarios will compare MEDS for
selecting the best path if the other attributes higher up in the selection
process (weight, local preference, as_path, origin) are equal.
Colin
-----Original Message-----
From: Angelo De Guzman [mailto:ghie_pogi@yahoo.com]
Sent: 25 August 2002 13:33
To: ccielab@groupstudy.com
Subject: simple MED question
Hi,
"By default, BGP compares MED attribute of routes
coming from neighbors in the same external AS"
Is this statement true?
If yes, does it do this on a per router basis or a per
AS basis?
Per router basis:
R1 in AS 1 ---
\---R3 in AS 2 (R3 compares MED)
R2 in AS 1 ---/
Per AS basis
R1 in AS 1 ----R3 in AS 2
| |
R2 in AS 1 ----R4 in AS 2
I'm not sure if R3 compares med with R4...
Many Thanks,
Angelo
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:36 GMT-3