In the neutron v2 api, it is allowed to filter result of list specifying some provider extension parameters.

• provider:network_type
• provider:physical_network
• provider:segmentation_id

ref: https://docs.openstack.org/api-ref/network/v2/index.html#list-networks

However, gophercloud does not support them, though Create/Update with provider extension parameters are allowed.

ref: https://github.com/gophercloud/gophercloud/blob/main/openstack/networking/v2/extensions/provider/requests.go