GroupStudy.com GroupStudy.com - A virtual community of network engineers
 Home  BookStore  StudyNotes  Links  Archives  StudyRooms  HelpWanted  Discounts  Login
RE: BGP question posted 08/18/2000
[Chronological Index] [Thread Index] [Top] [Date Prev][Date Next] [Thread Prev][Thread Next]


Ah yes, that's what I get for replying to e-mails while on-site....

the deterministic med is used because the behavior of AS's inside of a
confederation assumes the characteristics of IBGP.

For example, if as 65001 and 65002 were part of the confederation with real
AS 704, then 65001 and wouldn't use MED if there were multiple links to
65002, you would have to use other methods (local pref, etc).  The bgp
deterministic med will allow AS 65001 to use MED in path selection for
routes coming from 65002, even though the link is "IBGP".

Bill

-----Original Message-----
From: bert [mailto:bert]On Behalf Of Bert Kellerman
Sent: Thursday, August 17, 2000 8:30 PM
To: William Dicks
Cc: ccielab@xxxxxxxxxxxxxx
Subject: Re: BGP question


Bill,
    I think what you are describing is accomplished by 'bgp
always-compare-med'

Bert

William Dicks wrote:

> Normally, MED is only compared between routes received from one AS.
>
> For example,if you are AS 1400 and you have 3 WAN connections.  2 of those
> are to UUNET (AS701) and one is to AS1300.  If you receive the route for
say
> 209.224.0.0 from all three connections, BGP will only use MED to compare
the
> 2 routes from UUNET, but not from AS1300.  That command will have the
router
> compare MEDs from different AS's, in this case AS701 and AS1300.
>
> Bill Dicks
> CCIE # 6081
>
> -----Original Message-----
> From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx]On Behalf Of
> Matt Lachberg 3
> Sent: Wednesday, August 16, 2000 11:31 AM
> To: ccielab@xxxxxxxxxxxxxx
> Subject: BGP question
>
> Could someone explain this command?
>
> Configure the Router to Use the MED to Choose a Path in a Confederation
> To configure the router to use the MED to select the best path from among
> paths advertised by a single sub-AS within a confederation, use the
> following command in router configuration mode: Command  Purpose
>
> bgp deterministic med
>
>  Configures the router to consider the MED in choosing the best path from
> among paths advertised by a single sub-AS within the confederation.
>
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np1_c
> /1cprt1/1cbgp.htm#27727
>
> Matthew Lachberg, CCNP, CCDP, MCSE
>
> _______________________________________________________
> To unsubscribe from the CCIELAB list, send a message to
> majordomo@xxxxxxxxxxxxxx with the body containing:
> unsubscribe ccielab
>
> _______________________________________________________
> To unsubscribe from the CCIELAB list, send a message to
> majordomo@xxxxxxxxxxxxxx with the body containing:
> unsubscribe ccielab

_______________________________________________________
To unsubscribe from the CCIELAB list, send a message to
majordomo@xxxxxxxxxxxxxx with the body containing:
unsubscribe ccielab