This object is the master on/off switch for Layer 2 Protocol Tunneling (L2PT) on the switch, a feature that lets protocols like STP or GVRP pass transparently through the provider's network between customer sites. An administrator sets it to enabled to activate tunneling switch-wide, or disabled to turn the feature off entirely regardless of any individual port settings. For example, setting this object to disabled(2) would stop the switch from tunneling any Layer 2 protocol frames even if individual ports are still configured as UNI ports.