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[Artom Lifshitz <1969980@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

This is really a continuation of bug 1888395.

Steps to reproduce
==================
Have Neutron without multiple port bindings extension.
Boot an instance with network interfaces.
Live migrate, and fail the live migration somehow (easy to do in func tests)

Expected result
===============
Rollback happens correctly.

Actual result
=============
Rollback fails with NotImplementedError: Cannot load 'vifs' in the base class


Environment
===========
Reported against stable/wallaby [1], still reproducible in func tests on master.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=2077964

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1969980

Title:
  Live migration rollback fails if no Neutorn multiple port bindings
  extension

Status in OpenStack Compute (nova):
  New

Bug description:
  This is really a continuation of bug 1888395.

  Steps to reproduce
  ==================
  Have Neutron without multiple port bindings extension.
  Boot an instance with network interfaces.
  Live migrate, and fail the live migration somehow (easy to do in func tests)

  Expected result
  ===============
  Rollback happens correctly.

  Actual result
  =============
  Rollback fails with NotImplementedError: Cannot load 'vifs' in the base class

  
  Environment
  ===========
  Reported against stable/wallaby [1], still reproducible in func tests on master.

  [1] https://bugzilla.redhat.com/show_bug.cgi?id=2077964

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