I have the 2-node setup described here: https://docs.google.com/presentation/d/1KIuNDuUJGGEV37Zk9yzx9OSnWExt4iD2Z7afycFLf_I/edit#slide=id.p4

Except, I'm using an external ODL controller built from the master branch (I've seen this with the Li branch also).

After I unstack the nodes, the GatewayMacResolverService (aka periodic ARP) continues to try to resolve gateway continues to try to resolve the MAC for the gateway as indicated by the following error in the log that keeps repeating:

2015-12-27 07:51:01,704 | ERROR | pool-48-thread-1 | GatewayMacResolverService | 269 - org.opendaylight.ovsdb.openstack.net-virt-providers - 1.2.1.SNAPSHOT | MAC address for gateway 192.168.56.1 can not be resolved, because external bridge 6822471333697 is not connected to controller.

Full log can be seen here:
https://gist.github.com/0b6de0de84ff65d3887c

Can we recognize this case, and delete the gateway?