From: Petr Lapukhov (petrsoft@gmail.com)
Date: Fri Jun 02 2006 - 15:45:56 ART
Victor,
I don't recall the scenario exactly,
but AFAIR the goal was to prefer MED over AS-PATH to select
best-path. (MED follows origin, and origin follows as-path lenght
in bes-path selection)
And always compare med is required since routes were
received from different neighboring autonomous systems
HTH
Petr
2006/6/2, Victor Cappuccio <cvictor@protokolgroup.com>:
>
> I do not get why in the solution they used the bgp always-compare-med &
> the
> bgp bestpath as-path ignore
>
> I had this configured in R2
>
> Rack1R2(config-router)#do show run | b router bgp
> router bgp 400
> no synchronization
> bgp router-id 150.1.2.2
> bgp log-neighbor-changes
> neighbor 150.1.1.1 remote-as 300
> neighbor 150.1.1.1 ebgp-multihop 255
> neighbor 150.1.1.1 update-source Loopback0
> neighbor 150.1.7.7 remote-as 100
> neighbor 150.1.7.7 ebgp-multihop 255
> neighbor 150.1.7.7 update-source Loopback0
> no auto-summary
>
>
> and this is the output from R2 BGP Table..
>
>
>
> Rack1R2(config-router)#do show ip bgp
>
>
> BGP table version is 81, local router ID is 150.1.2.2
>
>
> Status codes: s suppressed, d damped, h history, * valid, > best, i -
> internal,
>
> r RIB-failure, S Stale
>
>
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
>
>
>
>
> Network Next Hop Metric LocPrf Weight Path
>
>
> *> 28.119.16.0/24 150.1.1.1 100 0 300 200 100
> 54
> i
>
> * 150.1.7.7 200 0 100 54 i
>
>
> *> 28.119.17.0/24 150.1.1.1 100 0 300 200 100
> 54
> i
>
> * 150.1.7.7 200 0 100 54 i
>
>
> *> 112.0.0.0 150.1.1.1 100 0 300 200 100
> 54
> 50 60 i
>
> * 150.1.7.7 200 0 100 54 50 60
> i
>
>
> *> 113.0.0.0 150.1.1.1 100 0 300 200 100
> 54
> 50 60 i
>
> * 150.1.7.7 200 0 100 54 50 60
> i
>
>
> *> 114.0.0.0 150.1.1.1 100 0 300 200 100
> 54
> i
>
> * 150.1.7.7 200 0 100 54 i
>
>
> *> 115.0.0.0 150.1.1.1 100 0 300 200 100
> 54
> i
>
> * 150.1.7.7 200 0 100 54 i
>
>
> *> 116.0.0.0 150.1.1.1 100 0 300 200 100
> 54
> i
>
> * 150.1.7.7 200 0 100 54 i
>
>
> *> 117.0.0.0 150.1.1.1 100 0 300 200 100
> 54
> i
>
> * 150.1.7.7 200 0 100 54 i
>
>
> *> 118.0.0.0 150.1.1.1 100 0 300 200 100
> 54
> i
>
> * 150.1.7.7 200 0 100 54 i
>
>
> *> 119.0.0.0 150.1.1.1 100 0 300 200 100
> 54
> i
>
> * 150.1.7.7 200 0 100 54 i
>
>
> *> 172.168.1.0/24 150.1.1.1 100 0 300 200 100
> 54
> ?
>
>
>
>
>
> Please help
> Thank
> Victor.
>
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This archive was generated by hypermail 2.1.4 : Sat Jul 01 2006 - 07:57:31 ART