AW: Re: BGP path prepend / route selection

[Amadeus]

Thanks Alexander that helps!

Best wishes, Amadeus


>---- Original Message ----
>From: Alexander Shikov <a.shikov at dtel-ix.net>
>To: "Amadeus" <amadeus at freehop.mooo.com>
>Cc: bird-users at network.cz
>Sent: Fr, Okt 25, 2013, 5:30 PM
>Subject: Re: BGP path prepend / route selection
>
>Hi,
>
>On Fri, Oct 25, 2013 at 03:56:45PM +0000, Amadeus wrote:
>> Dear list,
>> can you explain why the following route (0.0.0.0/0) is selected to go via
>> as403, as as4057 clearly displays the shortest path here?
>> As you can see I have used bgp_path.prepend() 3x on as403 for its own ASN.
>> Thanks, Amadeus
>> bird> show route for 0.0.0.0/0 table ffc all
>> 0.0.0.0/0          via 169.254.40.3 on ffc403 [as403 14:38] * (150)
>> [AS403i]
>>  Type: BGP unicast univ
>>  BGP.origin: IGP
>>  BGP.as_path: 403 403 403 403
>>  BGP.next_hop: 169.254.40.3
>>  BGP.local_pref: 100
>>                    via 169.254.40.64 on ffc4064 [as4064 14:32] (100)
>> [AS4057i]
>>  Type: BGP unicast univ
>>  BGP.origin: IGP
>>  BGP.as_path: 4064 40120 4057
>>  BGP.next_hop: 169.254.40.64
>>  BGP.local_pref: 100
>>                    via 169.254.40.57 on ffc4057 [as4057 Oct14] (100)
>> [AS4057i]
>>  Type: BGP unicast univ
>>  BGP.origin: IGP
>>  BGP.as_path: 4057
>>  BGP.next_hop: 169.254.40.57
>>  BGP.local_pref: 100
>
>it is because local-pref. Default route to AS403 has higher local-pref 
>than one to AS4057.
>
>-- 
>Alexander Shikov
>Technical Staff, Digital Telecom IX
>Tel.: +380 44 201 14 07
>http://dtel-ix.net/