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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1233391

Title:
  arping can be spawned in background to speed-up floating IP assignment

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  The arping command is spawned in a shell from the l3-agent with a
  default of sending 3 requests (send_arp_for_ha = 3).  This can
  increase the time the agent spends waiting by 2 seconds for each IP
  address, which adds up on a very busy network node, and is worse then
  the agent is restarted and associates many IP addresses on a router at
  the same time.

  Spawning the arping call in a greenthread will help speed this up, and
  is perfectly fine since if the arping fails for some reason it will
  still log an error, just asynchronously.

  In addition to floating IP assignment, this also applies to any other
  address assigned to the external interface of a router.

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