Fan network breaks bird? (solved)

I have a lxd/3.0.3 cluster with fan network works great,
and I try k8s on the same hosts, but calico-node can not ready,
got these logs:

bird: KIF: Invalid interface address 240.24.0.1 for fanbr0
bird: KIF: Invalid interface address 240.24.0.1 for fanbr0
bird: KIF: Invalid interface address 240.24.0.1 for fanbr0
bird: KIF: Invalid interface address 240.24.0.1 for fanbr0

Update:
above logs was harmless , fixed by setting calico option:

IP_AUTODETECTION_METHOD=interface=eth.*

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