Comment 1 for bug 1804842

by undercloud/overcloud, do you mean triple-o?

problem 1 means you rebooted openvswitch (ovs-vswitchd/ovsdb-server) without restarting
neutron-ovs-agent? maybe canary flow check is not working well for some reasons. can you provide the log of ovs agent?

problem 2 means you killed ovs-vswitchd? looks unrelated to neutron.