Comment 2 for bug 1633306

Hi, John:
Thank you for reply this.
In your point 3, the 'sync_router' [1] , [2], [3] patches are all backported to our local mitaka branch. And yes, IpAddressGenerationFailure is now the problem. Maybe we need try to verify the master first.

And I think the exception may be raised by the following procedure, not involved the L3 agent:
1. create one HA router
2. create HA network and the HA port
3. delete HA router
4. delete HA network and it's subnet, transaction not committed
6. new HA router API comes, as HA network has no subnets

Or.
1. create one HA router1
2. create HA network, Partially without subnet
3. new HA router2 API comes

Sorry for the inaccurate description, the temporarily solution is only locally in our cloud deployment.

[1] https://review.openstack.org/#/c/349238/
[2] https://review.openstack.org/#/c/332102/
[3] https://review.openstack.org/#/c/365653/