isa logical device interface with the associated protocol. In Fibre Channel (FC), the FC ports
have a special designation that expresses the functionality and is identified by an underscore. The node loop port supports the arbitrated loop, FC-AL, with its functions and protocols. An NL_Port connects an Arbitrated Loop to other NL ports and FL_Ports, supports creation, detection, and message flow to and from the connected system. NL_Ports are end ports in virtual point-to-point connections of a fabric. For example, the NL_Port to F_Port to N_Port uses an FC switch.