Comment 3 for bug 1268762

Reviewed: https://review.openstack.org/66451
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=b78eea6146145793a7c61705a1602cf5e9ac3d3a
Submitter: Jenkins
Branch: master

commit b78eea6146145793a7c61705a1602cf5e9ac3d3a
Author: Aaron Rosen <email address hidden>
Date: Mon Jan 13 13:57:04 2014 -0800

    Remove and recreate interface if already exists

    If the dhcp-agent machine restarts when openvswitch comes up it logs the
    following warning messages for all tap interfaces that do not exist:

    bridge|WARN|could not open network device tap2cf7dbad-9d (No such device)

    Once the dhcp-agent starts it recreates the interfaces and re-adds them to the
    ovs-bridge. Unfortunately, ovs does not reinitialize the interfaces as they
    are already in ovsdb and does not assign them a ofport number.

    This situation corrects itself though the next time a port is added to the
    ovs-bridge which is why no one has probably noticed this issue till now.

    In order to correct this we should first remove interface that exist and
    then readd them.

    Closes-bug: #1268762

    Change-Id: I4bb0019135ab7fa7cdfa6d5db3bff6eafe22fc85