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Planning Considerations for Fibre Channel Topologies
3
Public Versus Private
Devices
McDATA Products in a SAN Environment - Planning Manual
3-6
Sphereon
4300 and 4500 Fabric Switches
and private arbitrated loop devices as follows:
•
Public device - A loop device that can transmit a fabric login
(FLOGI) command to the switch, receive acknowledgement from
the switch's login server, register with the switch's name server,
and communicate with fabric-attached devices is a public device.
Sphereon
for the Fibre Channel architectural limit of 127 devices per Fibre
Channel port, when configured as an FL_Port. Each FL_Port is
assigned one arbitrated loop physical address (AL_PA), leaving
126 AL_PAs per port available for device connections. Up to 32
public devices can be connected to each of the FL_Ports (12 ports
for the Sphereon 4300 Switch, 24 ports for the Sphereon 4500
Switch). As shown in
connected to a Sphereon 4500 Switch and can communicate with
fabric-attached device D
Public Device Connectivity
Figure 3-3
Public devices support normal fabric operational requirements,
such as fabric busy and reject conditions, frame multiplexing, and
frame delivery order.
4300 and 4500 Fabric Switches
Figure
3-3, server S
.
1
support connection of public
provide loop connectivity
is a public loop device
2
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