[openstack-dev] [Neutron] _notify_port_updated in ML2 plugin doesn't take effect under some conditions

Li Ma mali at awcloud.com
Mon Mar 17 08:11:49 UTC 2014

Hi stackers,

I'm trying to extend the capability of port by propagating
binding:profile from neutron-server to l2-agents.

When I issue update-port-api with a new binding:profile, I find that the
action is not notified to any agents. Then I check the code and find the
following function:

def _notify_port_updated(self, mech_context):
        port = mech_context._port
        segment = mech_context.bound_segment
        if not segment:
            # REVISIT(rkukura): This should notify agent to unplug port
            network = mech_context.network.current
            LOG.warning(_("In _notify_port_updated(), no bound segment for "
                          "port %(port_id)s on network %(network_id)s"),
                        {'port_id': port['id'],
                         'network_id': network['id']})
        self.notifier.port_update(mech_context._plugin_context, port,

I'm not sure why it checks bound segment here to prevent sending
port_update out?
In my situation, I run a devstack environment and the bound segment is
None by default. Actually, I need this message to be sent out in any

I'd appreciate any hints.

Thanks a lot,

Li Ma

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