HP StorageWorks MSA 2.8 SAN Switch - Manual (Page 144)

Updating Switches to the Core PID Addressing
144 Fabric OS Procedures Version 3.1.x/4.1.x User Guide
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
The larger port-count format is XXYYZZ:
Table 9: 16-Port Count Addressing
Address Format Represents
XX1YZZ
XX Refers to the Domain ID
“1” Refers to a constant (based on a conservative reading
of the Fibre Channel standards)
“Y” Refers to a hexadecimal number, which specifies a
particular port on a switch.
ZZ Refers to the AL_PA.
Table 10: Larger Port Count Addressing
Address Format Represents
XXYYZZ
XX Refers to the Domain ID.
“YY” Represents a port (using the entire middle byte allows
addressing up to 256 ports per switch)
ZZ Refers to the AL_PA.