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[Launchpad Bug Tracker <1523999@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1523999

Title:
  Any error in L3 agent after external gateway is configured but before
  the local cache is updated results in errors in subsequent router
  updates

Status in neutron:
  Expired

Bug description:
  Reproduction:
  * Create a new router
  * Attach external interface - Execute external_gateway_added successfully but fail some time before self.ex_gw_port = self.get_ex_gw_port() (An example of a failure would be an RPC error when trying to update FIP statuses. In such a case extra routes would not be configured either, and post-router creation events would not be sent, which means that for example the metadata proxy wouldn't be started).

  Any follow up update to the router (Add/remove interface, add/remove
  FIP) will fail non-idempotent operations on the external device. This
  is because any update will try to add the gateway again (Because
  self.ex_gw_port = None). Even without a specific failure,
  reconfiguring the external device is wasteful.

  HA routers in particular will fail by throwing
  VIPDuplicateAddressException for the external device's VIP. This
  behavior was actually changed in a recent Mitaka patch
  (https://review.openstack.org/#/c/196893/50/neutron/agent/l3/ha_router.py),
  so this affects Juno to Liberty but not master and future releases.

  The impact on legacy or distributed routers is less severe as their
  process_external and routes_updated seem to be idempotent - Verified
  against master via a makeshift functional test, I could not vouch for
  previous releases.

  Severity: It's severe for HA routers from Juno to Liberty, but not as
  much for other routes types or HA routers on master.

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