FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Environment Planning Manual (620-000124-500, April 2005)

3
Planning Considerations for Fibre Channel Topologies
3-7
Planning Considerations for Fibre Channel Topologies
• Private device - A loop device that cannot transmit an FLOGI
command to the switch nor communicate with fabric-attached
devices is a private device. As shown in Figure 3-4, device D
2
is a
private loop device connected to a Sphereon 4500 Switch and
cannot communicate with any fabric-attached device. However,
device D
2
can communicate with switch-attached server S
2
(using
private addressing mode).
Public and private devices are partitioned into two separate
address spaces defined in the Fibre Channel address. Private
address spaces are isolated from a switched fabric. The switch
does not support any other form of Fibre Channel address
conversion (spoofing) that would allow private device-to-fabric
device communication.
NOTE: A private device can connect to the switch (loop) while a public
device is connected and using an E_Port to communicate with a switched
fabric.
Figure 3-4 Private Device Connectivity