Comment 3 for bug 1655917

I cannot reproduce this with neutron/master::

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ubuntu@diag:~/devstack$ neutron net-show net1
+---------------------------+--------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------+
| admin_state_up | True |
| availability_zone_hints | |
| availability_zones | |
| created_at | 2017-01-12T14:12:57Z |
| description | |
| id | 0b60bfa7-08e6-4ce6-8a71-a51aa6065b4c |
| ipv4_address_scope | |
| ipv6_address_scope | |
| mtu | 1450 |
| name | net1 |
| port_security_enabled | True |
| project_id | db997839c32842fab5fe7f390e8015c8 |
| provider:network_type | vxlan |
| provider:physical_network | |
| provider:segmentation_id | 47 |
| revision_number | 3 |
| router:external | False |
| shared | False |
| status | ACTIVE |
| subnets | |
| tags | |
| tenant_id | db997839c32842fab5fe7f390e8015c8 |
| updated_at | 2017-01-12T14:12:57Z |
+---------------------------+--------------------------------------+
ubuntu@diag:~/devstack$ neutron net-update net1 --router:external=True
Updated network: net1
ubuntu@diag:~/devstack$ neutron net-show net1
+---------------------------+--------------------------------------+
| Field | Value |
+---------------------------+--------------------------------------+
| admin_state_up | True |
| availability_zone_hints | |
| availability_zones | |
| created_at | 2017-01-12T14:12:57Z |
| description | |
| id | 0b60bfa7-08e6-4ce6-8a71-a51aa6065b4c |
| ipv4_address_scope | |
| ipv6_address_scope | |
| is_default | False |
| mtu | 1450 |
| name | net1 |
| port_security_enabled | True |
| project_id | db997839c32842fab5fe7f390e8015c8 |
| provider:network_type | vxlan |
| provider:physical_network | |
| provider:segmentation_id | 47 |
| revision_number | 4 |
| router:external | True |
| shared | False |
| status | ACTIVE |
| subnets | |
| tags | |
| tenant_id | db997839c32842fab5fe7f390e8015c8 |
| updated_at | 2017-01-12T14:13:21Z |
+---------------------------+--------------------------------------+
ubuntu@diag:~/devstack$

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I'll have to retry this with newton