[c-nsp] Choosing iBGP over eBGP

[david.ponsdesserre at uk.bnpparibas.com]

Hello . 

My opinion is Routes are matched against BGP best path selection. If you 
have same
metrics/variables of a prefix received via eBGP and iBGP, eBGP will win.

Then onto admin distance, 20 for ebgp, 200 for ibgp.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094431.shtml

Best Regards,
David




Internet
kanagaraj at aims.com.my

Sent by: cisco-nsp-bounces at puck.nether.net
09/10/2006 11:16

To
oboehmer, cisco-nsp
cc

Subject
Re: [c-nsp] Choosing iBGP over eBGP






Oli,
     The "show ip bgp <prefix>" only shows the eBGP path. Here are further 
details on the network setup:

- The router where the eBGP path is prefered is directly connected to that 
particular upstream (which advertises the eBGP route).
- The iBGP route is received by the router through route reflector.

Regards,
Kana
  ----- Original Message ----- 
  From: Oliver Boehmer (oboehmer) 
  To: Kanagaraj Krishna ; cisco-nsp at puck.nether.net 
  Sent: Sunday, October 08, 2006 3:46 PM
  Subject: RE: [c-nsp] Choosing iBGP over eBGP


  cisco-nsp-bounces at puck.nether.net <> wrote on :

  > Hi,
  >    I have a problem where an eBGP path is being selected over an iBGP
  > path, although the latter is better option (shorter AS hop and better
  > latency). From my understanding the iBGP vs eBGP selection criteria
  > is way below the higher priority of shorter AS path hop selection
  > criteria. Am i right? I've even tried to lower the local preference
  > for the eBGP path without much success. Any tips out there that I can
  > use to make this work? Thanks. 

  please post "show ip bgp <prefix>" to let us take a look at the details.

  oli
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