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---
fixes:
- |
As part of a `bug #1715317`_, MAC ageing was disabled for the intermediate
bridge created as part of the hybrid plug mechanism. During the removal
of ``brctl``, this behavior was inadvertently applied to all linux bridges
created by os-vif including those used in the linuxbridge driver.
As a result this can lead to packet flooding (see bug #1837252) when
instances are migrated. This behavior has been reverted so that the
default mac ageing is determined by the kernel and is not set when using
the os-vif linux bridge plugin.
.. _bug #1715317: https://bugs.launchpad.net/os-vif/+bug/1837252
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