Neutron extensions
Neutron extensions allow a plugin to extend the Neutron API to provide advanced functionality or expose a capability before it is incorporated into the official API.
Listing the Neutron API extensions
To list the extensions available in Neutron, use the Neutron ext-list command, as follows:
Usage: ext-list
The returned output includes a list of the available extensions, as shown in the following screenshot:

Figure A.1
Showing the details of an API extension
To show the details of an API extension, use the Neutron ext-show command, as follows:
Usage: ext-show EXTENSION_ALIAS
Here, the keyword EXTENSION_ALIAS represents the alias of the extension provided in the ext-list output. The returned output includes the alias, description, name, namespace, and updated date of the specified extension.
To find more information on creating Neutron API extensions, visit the Neutron development Wikipedia page at the following location: