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[Slawek Kaplonski <1840443@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

In some deployments it may be that same external bridge (br-ex for example) is used to provide data plane connectivity connectivity for vms but also connectivity for control plane, e.g. neutron openvswitch agent uses it to connect to rabbitmq.
That may lead to "dead lock" after e.g. host reboot. It happens like that because br-ex is set by neutron agent to be in faile_mode=secure and that means that if there are no openflow rules added for bridge, it will not proceed any packets. And as there is no connection to rabbitmq, neutron-ovs-agent is failing on setup_rpc method (here: https://github.com/openstack/neutron/blob/30a60d04f098581340f83b38b7a79104308c66bc/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L198) so will never configure initial rules for physical bridges which is done here: https://github.com/openstack/neutron/blob/30a60d04f098581340f83b38b7a79104308c66bc/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L212

To fix this problem, we should do initialization of physical bridges
before setup rpc.

** Affects: neutron
     Importance: Medium
     Assignee: Slawek Kaplonski (slaweq)
         Status: Confirmed


** Tags: ovs

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https://bugs.launchpad.net/bugs/1840443

Title:
  [OVS agent] Physical bridges can't be initialized if there is no
  connectivity to rabbitmq

Status in neutron:
  Confirmed

Bug description:
  In some deployments it may be that same external bridge (br-ex for example) is used to provide data plane connectivity connectivity for vms but also connectivity for control plane, e.g. neutron openvswitch agent uses it to connect to rabbitmq.
  That may lead to "dead lock" after e.g. host reboot. It happens like that because br-ex is set by neutron agent to be in faile_mode=secure and that means that if there are no openflow rules added for bridge, it will not proceed any packets. And as there is no connection to rabbitmq, neutron-ovs-agent is failing on setup_rpc method (here: https://github.com/openstack/neutron/blob/30a60d04f098581340f83b38b7a79104308c66bc/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L198) so will never configure initial rules for physical bridges which is done here: https://github.com/openstack/neutron/blob/30a60d04f098581340f83b38b7a79104308c66bc/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L212

  To fix this problem, we should do initialization of physical bridges
  before setup rpc.

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