| This submode is used to create, then describe the membership of |
| devices for the named VNS. Within this submode, properties of |
| the VNS can be configured. Interface-rules are configured and |
| managed, which configure the membership of devices. |
| |
| The controller provides a VNS named 'default' to collect devices |
| which are not associated with any VNS. |
| |
| Part of the configuration associated with a VNS includes the |
| association of a particular address-space. When not speficially |
| configured, the 'default' address-space is associated with the |
| VNS. |
| |
| Each address-space also has an associated default VNS. IF the |
| address space is called 'yellow', then the default VNS for this |
| address space is called 'yellow-default' |