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[Eugene Nikanorov <enikanorov@xxxxxxxxxxxx>]

Agree with Itzik's analysis.
Closing as 'Invalid'

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

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https://bugs.launchpad.net/bugs/1456809

Title:
  L3-agent not recreating missing fg- device

Status in OpenStack Neutron (virtual network service):
  Invalid

Bug description:
  When using DVR, the fg device in a compute is needed to access VMs on
  a compute node.  If for any reason the fg- device is deleted.  users
  will not be able access the VMs on the compute node.

  On a single node system where the L3-agent is running in 'dvr-snat'
  mode, a VM is booted up and assigned a floating-ip.  The VM is
  pingable using the floating IP.  Now I go into the fip namespace and
  delete the fg device using the command "ovs-vsctl del-port br-ex fg-
  ccbd7bcb-75. "   Now the the VM can no longer be pinged.

  Then another VM is booted up and it is also assigned a Floating IP.
  The new VM is not pingable either.

  The L3-agent log shows it reported that it cannot find fg-ccbd7bcb-75
  when setting up the qrouter and fip namespaces for the new floating
  IP.  But it didn't not go and re-create the fg- device.

  Given that this is a deliberate act to cause the cloud  to fail, the
  L3-agent could have gone ahead and re-create the fg device to make it
  more fault tolerant.

  The problem can be reproduced with the latest neutron code.

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