On Fri, 2021-03-12 at 08:13 +0000, Tobias Urdin wrote:
> Hello,
>
> If it's the same as us, then yes, the issue occurs on Train and is not completely solved yet.
there is a downstream bug trackker for this

https://bugzilla.redhat.com/show_bug.cgi?id=1917675

its fixed by a combination of 3 enturon patches and i think 1 nova one

https://review.opendev.org/c/openstack/neutron/+/766277/
https://review.opendev.org/c/openstack/neutron/+/753314/
https://review.opendev.org/c/openstack/neutron/+/640258/

and
https://review.opendev.org/c/openstack/nova/+/770745

the first tree neutron patches would fix the evauate case but break live migration
the nova patch means live migration will work too although to fully fix the related
live migration packet loss issues you need

https://review.opendev.org/c/openstack/nova/+/747454/4
https://review.opendev.org/c/openstack/nova/+/742180/12
to fix live migration with network abckend that dont suppor tmultiple port binding
and
https://review.opendev.org/c/openstack/nova/+/602432 (the only one not merged yet.)
for live migrateon with ovs and hybridg plug=false (e.g. ovs firewall driver, noop or ovn instead of ml2/ovs.

multiple port binding was not actully the reason for this there was a race in neutorn itslef that would have haapend
even without multiple port binding between the dhcp agent and l2 agent.

some of those patches have been backported already and all shoudl eventually make ti to train the could be brought to stine potentially
if peopel are open to backport/review them.


>
>
> Best regards