Re: BGP Route Selection

From: Edward John <edwardjohn2020_at_googlemail.com>
Date: Wed, 15 Sep 2010 22:55:53 +0300

I checked this link already. What process/step you recommend me to choose
here? Can you elaborate bit exactly?

1. Weight - Local to the router - Not Applicable here
2. LPF - Local to the AS - Not Applicable here
3. Preferrence
network>redistribute - Not applicable here since prefix is originated by
network from single place
4. Shortest AS-Path - Not applicable here, AS path are same & prepending
will make the prefix only less preferred.
5. Origin Type - Prefix is already seen as IGP origin
6. MED
Already MED at R1 is 0 for this prefix. no -ve value calculated
7. eBGP>iBGP - Both path are eBGP learned at R1
8. Lowest IGP metric to BGP next-hop - both path directly connected eBGP
peers
9. NO Multipath required
10. When both are external, most stable one (oldest) is preferred
 <------------------------- ( I am stuck here)

*************************************************************************************
R1#show ip bgp 192.168.5.0
BGP routing table entry for 192.168.5.0/24, version 8
Paths: (2 available, best #1, table Default-IP-Routing-Table)
  Advertised to non peer-group peers:
  10.10.19.9
  55 10
    10.10.110.10 from 10.10.110.10 (173.31.0.10)
      Origin IGP, localpref 100, valid, external, best
  55 10
    10.10.19.9 from 10.10.19.9 (173.31.0.9)
      Origin IGP, localpref 100, valid, external

************************************************************************

-- 
*Regards,*
*John*
Blogs and organic groups at http://www.ccie.net
Received on Wed Sep 15 2010 - 22:55:53 ART

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