How BIRD chooses best route with confederation

[Vincent Bernat]

Hello,

The length of an AS_CONFED_SEQUENCE is considered 0 (RFC 5065, 5.3 3)). 
I think in your case, the tie break could be the router ID.

On 2024-11-05 15:38, Yakimus // Netassist NOC wrote:
> Hello!
> 
> I have an example of working BGP confederation, where, as I supose, the route is chosen not in the best way
> Could someone explain why the first route looks better than the second one?
> 
> Both are IGP, both have equal preference, but the second one have shorter as_path
> 
> BIRD 2.0.12 ready.
> Table master4:
> 194.145.125.0/24     unicast [LVI_v4 2024-11-03] * (100) [AS39063i]
>          via xx.xxx.132.22 on eth0.776
>          Type: BGP univ
>          BGP.origin: IGP
>          BGP.as_path: (43426 211288 29390) 39063
>          BGP.next_hop: xx.xxx.132.22
>          BGP.local_pref: 100
>                       unicast [DEAS_v4 2024-11-03] (100) [AS39063i]
>          via xx.xxx.132.19 on eth0.776
>          Type: BGP univ
>          BGP.origin: IGP
>          BGP.as_path: (29390) 39063
>          BGP.next_hop: xx.xxx.132.19
>          BGP.local_pref: 100
> 
> -- 
> NETassist