RE: [Bulk] BGP backdoor command

From: David Bombal (davidbombal@davidbombal.com)
Date: Thu Jul 06 2006 - 16:48:58 ART


Hi Matt,

EBGP has a lower administrative distance (20) to IGPs such as RIP (120),
EIGRP (90) etc. The idea is if RouterA is receiving an update for the same
route from RouterB via EBGP and via RouterC via EIGRP for example, RouterA
will prefer to go via RouterB (20 < 90). To change this behaviour, you can
configure the route as a backdoor route in BGP, so that the IGP route is
prefered over the EBGP route.

I hope this helps.

Thank you,
David Bombal
CCIE, CCSI, CCSP, CCDP, CCSP
http://www.ConfigureTerminal.com

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
mattclark@hispeed.ch
Sent: 06 July 2006 08:40
To: ccielab@groupstudy.com
Subject: [Bulk] BGP backdoor command

Hi group

Came across this command and wanted to know a useful example of when to
implement this feature. is a backdoor route just a fancy way of saying a
backup route if you lost routes? the DocCD states that a backdoor network is
treated as a local network, except that it is not advertised.
Any other explanations would be appreciated.

Matt



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