The type of an externally accessible port on a Provider Bridge. A customer-edge port is a C-VLAN component Port on a Provider Edge Bridge that is connected to customer owned equipment and receives and transmits frames for a single customer. Designating a port as a Customer Edge Port implies Provider Edge Bridge functionality and, specifically, the existence of a C-VLAN component associated with that port. This C-VLAN component is uniquely identified within the Bridge by the port number of the associated Customer Edge Port. A customer-network port is an S-VLAN component Port on a Provider Bridge or within a Provider Edge Bridge that receives and transmits frame for a single customer. A provider-network port is an S-VLAN component Port on a Provider Bridge that can transmit and receive frames for multiple customers.