code: def update_port_postcommit(self, context):
          
          vlan_segment, vxlan_segment = self._get_segments(
              context.top_bound_segment, context.bottom_bound_segment)
          orig_vlan_segment, orig_vxlan_segment = self._get_segments(
              context.original_top_bound_segment,
              context.original_bottom_bound_segment)
  
          if (self._is_vm_migrating(context, vlan_segment, orig_vlan_segment) or
                  self._is_status_down(context.current)):
              vni = (self._port_action_vxlan(
                  context.original, orig_vxlan_segment,
                  self._delete_nve_member) if orig_vxlan_segment else 0)
              self._port_action_vlan(context.original, orig_vlan_segment,
                                     self._delete_switch_entry, vni)
          elif self._is_supported_deviceowner(context.current):
              if nexus_help.is_baremetal(context.current):
                  all_switches, active_switches = (
                      self._get_baremetal_switches(context.current))
              else:
                  host_id = context.current.get(bc.portbindings.HOST_ID)
                  all_switches, active_switches = (
                      self._get_host_switches(host_id))
  
              # if switches not active but host_id is valid
              if not active_switches and all_switches:
                  raise excep.NexusConnectFailed(
                      nexus_host=all_switches[0], config="None",
                      exc="Update Port Failed: Nexus Switch "
                      "is down or replay in progress")
              vni = self._port_action_vxlan(context.current, vxlan_segment,
                          self._configure_nve_member) if vxlan_segment else 0
              self._port_action_vlan(context.current, vlan_segment,
                                     self._configure_port_entries, vni)
docs: Update port non-database commit event.