Comment 0 for bug 1270724

1. create net-gateway and gateway-connection. segmentation-type is vlan.

neutron net-gateway-create --device id=c4369a1c-3fb2-4f45-8ac7-17d15b20508e,interface_name=eth0 NetworkgatewayName
neutron net-gateway-connect NetworkgatewayName L2-1 --segmentation-type vlan
openstack@devstack:~/devstack$ neutron net-gateway-show NetworkgatewayName
+-----------+--------------------------------------------------------------------------------------------------------+
| Field | Value |
+-----------+--------------------------------------------------------------------------------------------------------+
| default | False |
| devices | {"interface_name": "eth0", "id": "c4369a1c-3fb2-4f45-8ac7-17d15b20508e"} |
| id | ab76582b-ea57-4184-82ce-68ad013aed5e |
| name | NetworkgatewayName |
| ports | {"port_id": "2e8d5d83-d2a2-4570-815a-fe61d2257568", "segmentation_type": "vlan", "segmentation_id": 0} |
| tenant_id | ec2918c3e7514158987c8f04c64d7521 |
+-----------+--------------------------------------------------------------------------------------------------------+

2. add network to gateway by net-gateway-connect. segmentation-type is flat.

openstack@devstack:~/devstack$ neutron net-gateway-connect NetworkgatewayName L2-2 --segmentation-type flat
Request Failed: internal server error while processing your request.

I think Neutron should not return 500.