assigning a fixed-ip while creating a port is not working

Build 1.10 29

Below I wanted to assign 70.1.1.254 to the port. But only the next-available IP of 70.1.1.3 was allocated

root@nodeg30:~# neutron port-create testvn2 --fixed-ip subnet-id=d236e7e9-830c-4bc0-b779-040ca64c65ed --fixed-ip ip-address=70.1.1.254
Created a new port:
+-----------------------+---------------------------------------------------------------------------------+
| Field | Value |
+-----------------------+---------------------------------------------------------------------------------+
| admin_state_up | True |
| device_id | |
| device_owner | |
| fixed_ips | {"subnet_id": "d236e7e9-830c-4bc0-b779-040ca64c65ed", "ip_address": "70.1.1.3"} |
| id | 205fe4ff-7ef4-4c73-b30a-796c416d48f1 |
| mac_address | 02:20:5f:e4:ff:7e |
| name | 205fe4ff-7ef4-4c73-b30a-796c416d48f1 |
| network_id | ee413758-d872-44f0-8541-1a2f0642fc97 |
| port_security_enabled | True |
| security_groups | |
| status | ACTIVE |
| tenant_id | bb2139daa52145508b21f4cbcdde0b42 |
+-----------------------+---------------------------------------------------------------------------------+
root@nodeg30:~#