Cant replicate in stable/newton 

[outofmemory@localhost devstack]$ neutron net-create Test2
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
neutroCreated a new network:
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | True                                 |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2017-01-12T15:25:27Z                 |
| description               |                                      |
| id                        | abfabc8a-7127-4bd3-83e8-205cd7f1d676 |
| ipv4_address_scope        |                                      |
| ipv6_address_scope        |                                      |
| mtu                       | 1450                                 |
| name                      | Test2                                |
| port_security_enabled     | True                                 |
| project_id                | 27ef7aeb8bca47dc823f294fa2a3ec2e     |
| provider:network_type     | vxlan                                |
| provider:physical_network |                                      |
| provider:segmentation_id  | 75                                   |
| qos_policy_id             |                                      |
| revision_number           | 3                                    |
| router:external           | False                                |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| tenant_id                 | 27ef7aeb8bca47dc823f294fa2a3ec2e     |
| updated_at                | 2017-01-12T15:25:27Z                 |
+---------------------------+--------------------------------------+
[outofmemory@localhost devstack]$ neutron net-update Test2 --router:external=True
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
Updated network: Test2
[outofmemory@localhost devstack]$ neutron net-show test2
neutron CLI is deprecated and will be removed in the future. Use openstack CLI instead.
+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | True                                 |
| availability_zone_hints   |                                      |
| availability_zones        |                                      |
| created_at                | 2017-01-12T15:25:27Z                 |
| description               |                                      |
| id                        | abfabc8a-7127-4bd3-83e8-205cd7f1d676 |
| ipv4_address_scope        |                                      |
| ipv6_address_scope        |                                      |
| is_default                | False                                |
| mtu                       | 1450                                 |
| name                      | Test2                                |
| port_security_enabled     | True                                 |
| project_id                | 27ef7aeb8bca47dc823f294fa2a3ec2e     |
| provider:network_type     | vxlan                                |
| provider:physical_network |                                      |
| provider:segmentation_id  | 75                                   |
| qos_policy_id             |                                      |
| revision_number           | 4                                    |
| router:external           | True                                 |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   |                                      |
| tags                      |                                      |
| tenant_id                 | 27ef7aeb8bca47dc823f294fa2a3ec2e     |
| updated_at                | 2017-01-12T15:25:49Z                 |
+---------------------------+--------------------------------------+
[outofmemory@localhost devstack]$