HP StorageWorks MSA 2/8 HP StorageWorks Fabric OS Procedures V3.1.x/4.1.x User - Page 144

Updating Switches to the Core PID Addressing About Fibre Channel Addressing There are two addressing mechanisms used in Fibre Channel: ■ Port Identifier (PID) - The PID is analogous to specifying the physical switch and port to which a device is attached in a network; it is not analogous to an IP address. PIDs are assigned by a Fibre Channel switch when a device logs into the fabric. A example PID might look like the following: 011F00. There are numerous situations in which a device's PID may change. ■ World Wide Name (WWN) - The WWN is analogous to an Ethernet MAC address. WWNs are assigned by the factory when a device is manufactured, and do not change. An example WWN might look like the following: 10:00:00:60:69:51:0e:8b. The method that HP Fibre Channel switches use to assign PIDs differs between the 16-port switches and the larger port count products. The smaller port-count format is: XX1YZZ Table 9: 16-Port Count Addressing Address Format XX "1" "Y" ZZ Represents XX1YZZ Refers to the Domain ID Refers to a constant (based on a conservative reading of the Fibre Channel standards) Refers to a hexadecimal number, which specifies a particular port on a switch. Refers to the AL_PA. The larger port-count format is XXYYZZ: Table 10: Larger Port Count Addressing Address Format XX "YY" ZZ Represents XXYYZZ Refers to the Domain ID. Represents a port (using the entire middle byte allows addressing up to 256 ports per switch) Refers to the AL_PA. 144 Fabric OS Procedures Version 3.1.x/4.1.x User Guide