reorder BGP plink preference

Eugene M. Zheganin emz at
Sun Jan 27 14:37:03 CET 2019


Well, I sat down to write the configuration and got immediately stuck: 
here's the thing: I have a pipe exporting from kernel tp given FIB, but 
in kernel I already have a default route from most preferable uplink - 
A, and I need a default route from B, which just isn't in the kernel. 
How do I deal with that ?


21.12.2018 13:21, Łukasz Jarosz пишет:
> Hi,
> Just use import filters in pipes exporting to your FIBs. To 
> distinguish uplinks, while applying priorities, use if condition on 
> source protocol's value or last ASN.
> Best regards,
> Lukasz
> pt., 21 gru 2018, 09:16: Eugene M. Zheganin <emz at 
> <mailto:emz at>> napisał(a):
>     Hello,
>     I have a bird router serving multiple BGP sessions with my AS
>     uplinks,
>     and now I need to create a more complicated thing, - I have
>     several FIBs
>     and I need to reorder the BGP link preference for a given FIB. Say, I
>     have 3 uplinks, A/B/C, A is the most preferable one for default
>     FIB, but
>     I need B to be the most preferable one for FIB 1. I have some basic
>     experience with multiple routing tables in bird, I'm successfully
>     using
>     two at the moment, but I just have no idea on how to do this. I
>     mean I
>     know how to make the B upstream the only channel for FIB 1 (without
>     redundancy), but I have no idea on how to reorder the preference in
>     order to keep the redundancy. Is there such a way ?
>     Thanks.
>     Eugene.
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