[Bug 1852221] Re: ovsdb-server needs to be restarted after adding protocols to bridges

[Rodolfo Alonso]

Related patch in Neutron: https://review.opendev.org/#/c/698715/

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https://bugs.launchpad.net/bugs/1852221

Title:
  ovsdb-server needs to be restarted after adding protocols to bridges

Status in OpenStack neutron-openvswitch charm:
  Invalid
Status in openvswitch package in Ubuntu:
  Confirmed

Bug description:
  As part of programming OpenvSwitch, Neutron will add to which
  protocols bridges support [0].

  However, the Open vSwitch `ovsdb-server` process does not appear to
  update its perspective of which protocol versions it should support
  until it is restarted:

  # ovs-ofctl -O OpenFlow14 dump-flows br-int
  2019-11-12T12:52:56Z|00001|vconn|WARN|unix:/var/run/openvswitch/br-int.mgmt: version negotiation failed (we support version 0x05, peer supports version 0x01)
  ovs-ofctl: br-int: failed to connect to socket (Broken pipe)

  # systemctl restart ovsdb-server 
  # ovs-ofctl -O OpenFlow14 dump-flows br-int
   cookie=0x84ead4b79da3289a, duration=1.576s, table=0, n_packets=0, n_bytes=0, priority=65535,vlan_tci=0x0fff/0x1fff actions=drop
   cookie=0x84ead4b79da3289a, duration=1.352s, table=0, n_packets=0, n_bytes=0, priority=5,in_port="int-br-ex",dl_dst=fa:16:3f:69:2e:c6 actions=goto_table:4
  ...
  (Success)

  0:
  https://github.com/openstack/neutron/blob/0fa7e74ebb386b178d36ae684ff04f03bdd6cb0d/neutron/agent/common/ovs_lib.py#L281

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