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[Corey Bryant <corey.bryant@xxxxxxxxxxxxx>]

** Also affects: neutron (Ubuntu Bionic)
   Importance: High
     Assignee: Corey Bryant (corey.bryant)
       Status: Triaged

** Also affects: neutron (Ubuntu Zesty)
   Importance: Undecided
       Status: New

** Also affects: neutron (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Changed in: neutron (Ubuntu Artful)
       Status: New => Triaged

** Changed in: neutron (Ubuntu Zesty)
       Status: New => Triaged

** Changed in: neutron (Ubuntu Zesty)
   Importance: Undecided => High

** Changed in: neutron (Ubuntu Zesty)
     Assignee: (unassigned) => Corey Bryant (corey.bryant)

** Changed in: neutron (Ubuntu Artful)
     Assignee: (unassigned) => Corey Bryant (corey.bryant)

** Changed in: neutron (Ubuntu Artful)
   Importance: Undecided => High

** Also affects: cloud-archive/queens
   Importance: High
     Assignee: Corey Bryant (corey.bryant)
       Status: Triaged

** Also affects: cloud-archive/ocata
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/pike
   Importance: Undecided
       Status: New

** Changed in: cloud-archive/ocata
       Status: New => Incomplete

** Changed in: cloud-archive/ocata
       Status: Incomplete => Triaged

** Changed in: cloud-archive/pike
       Status: New => Triaged

** Changed in: cloud-archive/ocata
   Importance: Undecided => High

** Changed in: cloud-archive/pike
     Assignee: (unassigned) => Corey Bryant (corey.bryant)

** Changed in: cloud-archive/ocata
     Assignee: (unassigned) => Corey Bryant (corey.bryant)

** Changed in: cloud-archive/pike
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1731595

Title:
  L3 HA: multiple agents are active at the same time

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive ocata series:
  Triaged
Status in Ubuntu Cloud Archive pike series:
  Triaged
Status in Ubuntu Cloud Archive queens series:
  Triaged
Status in neutron:
  In Progress
Status in neutron package in Ubuntu:
  Triaged
Status in neutron source package in Zesty:
  Triaged
Status in neutron source package in Artful:
  Triaged
Status in neutron source package in Bionic:
  Triaged

Bug description:
  OS: Xenial, Ocata from Ubuntu Cloud Archive
  We have three neutron-gateway hosts, with L3 HA enabled and a min of 2, max of 3.  There are approx. 400 routers defined.

  At some point (we weren't monitoring exactly) a number of the routers
  changed from being one active, and 1+ others standby, to >1 active.
  This included each of the 'active' namespaces having the same IP
  addresses allocated, and therefore traffic problems reaching
  instances.

  Removing the routers from all but one agent, and re-adding, resolved
  the issue.  Restarting one l3 agent also appeared to resolve the
  issue, but very slowly, to the point where we needed the system alive
  again faster and reverted to removing/re-adding.

  At the same time, a number of routers were listed without any agents
  active at all.  This situation appears to have been resolved by adding
  routers to agents, after several minutes downtime.

  I'm finding it very difficult to find relevant keepalived messages to
  indicate what's going on, but what I do notice is that all the agents
  have equal priority and are configured as 'backup'.

  I am trying to figure out a way to get a reproducer of this, it might
  be that we need to have a large number of routers configured on a
  small number of gateways.

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