Dear folks I have met a problem when implement IPAM driver, ML2 doesn't call remove_subnet function of ipam driver because ML2 doesn't use delete_subnet function of NeutronDbPluginV2 Now I workaround by using "SUBNET BEFORE_DELETE" event to notify external IPAM that subnet will be deleted, but I think it's not a good solution. According to my understanding this event should be used for checking subnet is in-used or not. I think ML2 should call IPAM driver for this situation or provide additional "SUBNET AFTER_DELETE" event Thanks, Thanh Email: legiangthan at gmail.com <legiangthanh at gmail.com> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20151111/c93563d1/attachment.html>