FC Addressing

World Wide Name WWN is a fixed, unique, 64-bit addresses assigned to each port by each manufacturer. There are 2 dynamic addresses that may be assigned when this port connects to a FC network. If it is connects to an arbitrated loop, it is assigned a dynamic 8-bit address, refered to as its arbitrated loop physical address (AL_PA). If it connects to a fabric, it will be assigned a dynamic 24-bit address, refered to as its native address identifier (S_ID). When a port is connected to both arbitrated loop and a fabric, it si assigned a 24-bit adddress, with the lower 8-bits as the AL_PA.