syslog full of "topology hint" logs

My syslog is full of log messages like this:

Oct 10 16:28:51 infra3 sh[22882]: #011 TopologyHint(ifname='eno49', vid=None, hint='on_remote_network', related_ifname='eno1', related_vid=None, related_mac='ec:b1:d7:7f:ff:b4'),
Oct 10 16:28:51 infra3 sh[22882]: #011 TopologyHint(ifname='eno49', vid=None, hint='on_remote_network', related_ifname='eno2', related_vid=None, related_mac='ec:b1:d7:73:fd:dd'),
Oct 10 16:28:51 infra3 sh[22882]: #011 TopologyHint(ifname='eno49', vid=None, hint='rx_own_beacon_on_other_interface', related_ifname='eno1', related_vid=None, related_mac=None),
Oct 10 16:28:51 infra3 sh[22882]: #011 TopologyHint(ifname='eno49', vid=None, hint='same_local_fabric_as', related_ifname='eno1', related_vid=None, related_mac=None)}

This is with 2.3.0~beta2-6323-g4941788-0ubuntu1~16.04.1

See the logs for 10.245.208.32 here:

https://bugs.launchpad.net/maas/+bug/1722578/+attachment/4966827/+files/logs-2017-10-10-15.58.12.tar