This object records which combination of network roles (for example, functions like edge or core roles bundled together) has been assigned to a given interface, and that role combination determines which QoS or access policies can be applied to it. An administrator sets this so that policy assignment tools know which policy types are even valid to apply on that interface, since policies are matched against declared roles rather than applied blindly. For example, setting this object to a role combination that includes "uplink" would make uplink-specific policies selectable for that interface where they otherwise wouldn't be.