From: Warner, Thomas S (thomas.s.warner@xxxxxxxx)
Date: Mon Aug 12 2002 - 20:20:12 GMT-3
Kris
One thing you have to remember with MEDs is that routers will only compare
MEDs from external neighbors that are in the _same_ AS. Notice that SJ and
LA are both in the "ANET" AS and NY is in the "YNET" AS. Therefore, the
metric of 120 is preferred. His point on this page is that this behavior
can be overridden with the bgp always-compare-med option. That option will
tell the router to compare MEDs for the same routes regardless of which AS
they came from.
Tom Warner
Lockheed Martin Enterprise Information Systems
Computing and Network Services
email: mailto:thomas.s.warner@lmco.com
-----Original Message-----
From: kris.keen@aon.com.au [mailto:kris.keen@aon.com.au]
Sent: Monday, August 12, 2002 6:41 PM
To: ccielab@groupstudy.com
Subject: BGP MED IRA Page 167
Hi All,
Reading MED this morning, there is a diagram o page 167, Figure 6-13. It
explains that a MED with a lower value takes perference, but reading the
explaination of the figure it says it will prefer the SJ router (MED=120),
I would have thought the NY router with MED=50 would have been preferred?
It says it is comapring 3 different sources.. Is it just to early in the
morning or am I clearly missing something?
Cheers
-----------------------------------------------------------------
Kris Keen - CCNP, CCDP, CNE
Network Support Specialist - Network Systems
Aon Risk Services Australia Limited
(612) 9253 7272
0404862970
E: Kris.Keen@aon.com.au
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:23 GMT-3