Custom thread group for BFD causes error - <FATAL> Express thread group not configured and "express" not found

Justin Cattle j at ocado.com
Tue May 19 14:21:57 CEST 2026


Hi,


I've been testing migrating to bird3.  I preferred to redefine the default
threading configs so that everything is explicit, rather than implicit.
But, when I defined the ¬eress" group, I got the following warning logged:

<WARN> Symbol 'express' overrides existing keyword


Rather than create create needless log lines, I though I would fix that by
creating my own custom thread group instead, and use that for BFD.

I created:

thread group responsive {
threads 1;
max latency 10 ms;
min time 1 ms;
max time 10 ms;
wakeup time 60 s;
}

protocol bfd {


thread group responsive;



interface "net0" {
interval 1000 ms;
multiplier 4;
};


interface "net1" {
interval 1000 ms;
multiplier 4;
};


}


However, the config validation then throws the following error:

<FATAL> Express thread group not configured and "express" not found


Is this a bug, or something I'm doing wrong ?

Thanks!


Cheers,
Just

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