From: Edison Ortiz (edisonmortiz@gmail.com)
Date: Sun Jun 24 2007 - 15:28:10 ART
http://www.cisco.com/warp/public/459/25.shtml
Step 11. Check the RID.
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Edison Ortiz
(Routing & Switching, CCIE # 17943)
----- Original Message -----
From: "Bit Gossip" <bit.gossip@chello.nl>
To: <ccielab@groupstudy.com>
Sent: Sunday, June 24, 2007 11:41 AM
Subject: BGP Best path selection
> maybe I should take a break....
> I can not understand the BGP selection process for these 2 prefixes:
> -for 28.119.16.0/24 the best next-hop is 204.12.1.254
> -for 112.0.0.0 instead it is 54.1.3.254
> Any idea why? The difference seems to be that the path with MED=0 is
> preferred
> over the path with missing MED, but I have NOT configured 'bgp bestpath
> med
> missing-as-worst' and so missing MED should be treated as MED=0
>
> Rack1R6#show ip bgp 28.119.16.0/24
> BGP routing table entry for 28.119.16.0/24, version 17
> Paths: (2 available, best #2, table Default-IP-Routing-Table)
> Flag: 0x820
> Advertised to update-groups:
> 1 2
> 54
> 54.1.3.254 from 54.1.3.254 (212.18.3.1)
> Origin IGP, localpref 100, valid, external
> 54
> 204.12.1.254 from 204.12.1.254 (31.3.0.1)
> Origin IGP, metric 0, localpref 100, valid, external, best
>
>
>
> Rack1R6#show ip bgp 112.0.0.0
> BGP routing table entry for 112.0.0.0/8, version 4
> Paths: (2 available, best #2, table Default-IP-Routing-Table)
> Advertised to update-groups:
> 1 2
> 54 50 60
> 204.12.1.254 from 204.12.1.254 (31.3.0.1)
> Origin IGP, localpref 100, valid, external
> 54 50 60
> 54.1.3.254 from 54.1.3.254 (212.18.3.1)
> Origin IGP, metric 0, localpref 100, valid, external, best
>
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This archive was generated by hypermail 2.1.4 : Sun Jul 01 2007 - 17:24:51 ART