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[Krzysztof Tomaszewski <1959151@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Because of the fix for bug #1597461[1] L3 agent puts all it's
HA ports down during initialization phase. Unfortunately such
operation can break already working L3 communication when
you restart agent service (rewiring port from down state to
up can takes few seconds and some VRRP packages could be lost
so router HA state change may be triggered).

This is an effect of calling:
self.plugin_rpc.update_all_ha_network_port_statuses
in neutron/agent/l3/agent.py#L393 during L3 agent
initialization phase in _check_ha_router_process_status.

Restarting agent process should not affect already working
configuration (customer traffic).

Possibly workaround would be to put HA ports to DOWN state
only on host restart and not on every L3 agent restart.

[1] https://bugs.launchpad.net/neutron/+bug/1597461

** Affects: neutron
     Importance: Undecided
     Assignee: Krzysztof Tomaszewski (labedz)
         Status: In Progress


** Tags: l3-dvr-backlog

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https://bugs.launchpad.net/bugs/1959151

Title:
  Don't set HA ports down while L3 agent restart.

Status in neutron:
  In Progress

Bug description:
  Because of the fix for bug #1597461[1] L3 agent puts all it's
  HA ports down during initialization phase. Unfortunately such
  operation can break already working L3 communication when
  you restart agent service (rewiring port from down state to
  up can takes few seconds and some VRRP packages could be lost
  so router HA state change may be triggered).

  This is an effect of calling:
  self.plugin_rpc.update_all_ha_network_port_statuses
  in neutron/agent/l3/agent.py#L393 during L3 agent
  initialization phase in _check_ha_router_process_status.

  Restarting agent process should not affect already working
  configuration (customer traffic).

  Possibly workaround would be to put HA ports to DOWN state
  only on host restart and not on every L3 agent restart.

  [1] https://bugs.launchpad.net/neutron/+bug/1597461

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