Hi all. I was working on this bug [1] (ML2 doesn't return fixed_ips on a port update with binding) I think it should be a DB issue, and I put some investigation result at [2]. I even made up some code change [3] to resolve the bug. But, I don't know the actual root cause for the problem. And why the code resolve the bug. Can someone tell me the reason? [1] https://bugs.launchpad.net/neutron/+bug/1585738 [2] https://bugs.launchpad.net/neutron/+bug/1585738/comments/5 [3] https://review.openstack.org/#/c/321152/3//COMMIT_MSG Thanks HongHui Xiao(肖宏辉) PMP®