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[Oleg Bondarev <obondarev@xxxxxxxxxxxx>]

Same as for bug 1222541 : auto_schedule_routers() has 'host' parameter
and is supposed to 'Schedule non-hosted routers to L3 Agent running on
host'. So supporting a single l3 agent is by design.

** Changed in: neutron
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1222539

Title:
  l3_agent_scheduler.ChanceScheduler.auto_schedule_routers only support
  single l3 agent

Status in OpenStack Neutron (virtual network service):
  Invalid

Bug description:
              try:
                  l3_agent = query.one()
              except (exc.MultipleResultsFound, exc.NoResultFound):
                  LOG.debug(_('No enabled L3 agent on host %s'),
                            host)
                  return False

  this is not a correct way for auto_schedule, meanwhile the
  ChanceScheduler.schedule() support l3 agent candidates

              active_l3_agents = plugin.get_l3_agents(context, active=True)
              if not active_l3_agents:
                  LOG.warn(_('No active L3 agents'))
                  return
              candidates = plugin.get_l3_agent_candidates(sync_router,
                                                          active_l3_agents)

  so i think the auto_schedule should support multiple l3 agents as
  schedule() does

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