Comment 3 for bug 1483690

Hi,

According to the bug, dhcp-agent association with the network is still existed even if no subnet with dhcp-enable is available.

openstack@openstack:/opt/stack/neutron$ neutron subnet-create f0ab9b8d-0977-4eb9-9ca4-d84142a90081 --name subnet1 2.2.2.0/24 --enable-dhcp
Created a new subnet:
+-------------------+------------------------------------------+
| Field | Value |
+-------------------+------------------------------------------+
| allocation_pools | {"start": "2.2.2.2", "end": "2.2.2.254"} |
| cidr | 2.2.2.0/24 |
| dns_nameservers | |
| enable_dhcp | True |
| gateway_ip | 2.2.2.1 |
| host_routes | |
| id | d81b2cd8-b318-4f9b-842c-bd809ebffb87 |
| ip_version | 4 |
| ipv6_address_mode | |
| ipv6_ra_mode | |
| name | subnet1 |
| network_id | f0ab9b8d-0977-4eb9-9ca4-d84142a90081 |
| subnetpool_id | |
| tenant_id | e998f06543e4477b9a0bd5359a740a39 |
+-------------------+------------------------------------------+

openstack@openstack:/opt/stack/neutron$ neutron dhcp-agent-list-hosting-net f0ab9b8d-0977-4eb9-9ca4-d84142a90081
+--------------------------------------+-----------+----------------+-------+
| id | host | admin_state_up | alive |
+--------------------------------------+-----------+----------------+-------+
| af4de443-2e24-4892-b104-4041ceb2899d | openstack | True | :-) |
+--------------------------------------+-----------+----------------+-------+

 Updating subnet with --disable-dhcp agent

openstack@openstack:/opt/stack/neutron$ neutron subnet-update d81b2cd8-b318-4f9b-842c-bd809ebffb87 --disable-dhcp
Updated subnet: d81b2cd8-b318-4f9b-842c-bd809ebffb87

Still dhcp-agent is running for that network
openstack@openstack:/opt/stack/neutron$ neutron dhcp-agent-list-hosting-net f0ab9b8d-0977-4eb9-9ca4-d84142a90081
+--------------------------------------+-----------+----------------+-------+
| id | host | admin_state_up | alive |
+--------------------------------------+-----------+----------------+-------+
| af4de443-2e24-4892-b104-4041ceb2899d | openstack | True | :-) |
+--------------------------------------+-----------+----------------+-------+
openstack@openstack:/opt/stack/neutron$

Proposing solution:
There should not be any dhcp-agent associated for given network if there is no subnet with dhcp-enable.

Please post your comments or concerns for this solution.