hi Shraddha Pandhe, I think your analysis is right, I also encountered the same problem， I have filed a bug[1] and commit a patch [2] for this bug.
thanks, hanzhang shi [1] https://launchpad.net/bugs/1469615 [2] https://review.openstack.org/#/c/196927/ 在 2015-07-01 08:25:48，"Shraddha Pandhe" <spandhe.openst...@gmail.com> 写道： Hi folks.. I have a question about neutron dhcp agent restart scenario. It seems like, when the agent restarts, it recovers the known network IDs in cache, but we don't recover the known ports [1]. So if a port that was present before agent restarted, is deleted after agent restart, the agent wont have it in its cache. So port here [2] will be None. So the port will actually never get deleted. Same problem will happen if a port is updated. Has anyone seen these issues? Am I missing something? [1] https://github.com/openstack/neutron/blob/master/neutron/agent/dhcp/agent.py#L82-L87 [2] https://github.com/openstack/neutron/blob/master/neutron/agent/dhcp/agent.py#L349
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