Hi This, in my case using the device's real hardware MAC address, works fine with the following configuration (well, only 50-br0.netdev matters):
$ cat /etc/systemd/network/50-br0.netdev
[NetDev]
Name=br0
Kind=bridge
MACAddress=01:23:45:67:89:AB
$ cat /etc/systemd/network/51-eth0.network
[Match]
Name=eth0
[Network]
Bridge=br0
$ cat /etc/systemd/network/60-br0.network
[Match]
Name=br0
[Network]
DHCP=yes
Regards
Stefan Lippers-Hollmann
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