Writing filters that change output depending on peer

[Alexander Zubkov]

Hi Nico,

I remembered some related question around a year ago:
https://trubka.network.cz/pipermail/bird-users/2024-September/017839.html

AFAIK such feature hasn't been implemented yet.

Regards,
Alexander

On Sat, Sep 13, 2025, 00:44 Nico Schottelius via Bird-users <
bird-users at network.cz> wrote:

>
> ... to follow up, from the documentation of bird 2:
>
> string proto
>
>     The name of the protocol which the route has been imported
>     from. Read-only.
>
> What I am looking for is the opposite:
>
> string proto_to_or_destination_or_better_name
>
>     The name of the protocol in which the filter or function is being
>     called in. Allows to match on the destination.
>
>     Example:
>
>     if(proto_to_or_destination_or_better_name = "asn_1" and net ...)
>     then accept;
>
> (obviously I made up the above description, but that's exactly what I'm
> looking for).
>
> Still curious on what others think about this.
>
> --
> Sustainable and modern Infrastructures by ungleich.ch
>
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