HP AM866A Brocade Troubleshooting and Diagnostics Guide v6.1.0 (53-1000853-01, - Page 32

Fabric OS Command Reference

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3 Port initialization and FCP auto discovery process Figure 1 shows the process behind port initialization. Understanding this process can help you determine where a problem resides. For example, if your switch cannot form an E_Port, you understand that the process never got to that point or does not recognize the switch as an E_Port. Possible solutions would be to look at licensing and port configuration. Verify that the correct licensing is installed or that the port is not configured as a loop port, a G_Port, or the port speed is not set. FIGURE 1 Simple port initialization process The FCP auto discovery process enables private storage devices that accept the process login (PRLI) to communicate in a fabric. If device probing is enabled, the embedded port logs in (PLOGI) and attempts a PRLI into the device to retrieve information to enter into the name server. This enables private devices that do not perform a fabric login (FLOGI), but accept PRLI, to be entered in the name server and receive full fabric citizenship. Private hosts require the QuickLoop feature which is not available in Fabric OS v4.0.0 and later. A fabric-capable device will register information with the Name Server during a FLOGI. These devices will typically register information with the name server before querying for a device list. The embedded port will still PLOGI and attempt PRLI with these devices. To display the contents of a switch's Name Server, use the nsShow or nsAllShow command. For more information about these name server commands, refer to Fabric OS Command Reference. 18 Fabric OS Troubleshooting and Diagnostics Guide 53-1000853-01

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18
Fabric OS Troubleshooting and Diagnostics Guide
53-1000853-01
Port initialization and FCP auto discovery process
3
Figure 1
shows the process behind port initialization. Understanding this process can help you
determine where a problem resides. For example, if your switch cannot form an E_Port, you
understand that the process never got to that point or does not recognize the switch as an E_Port.
Possible solutions would be to look at licensing and port configuration. Verify that the correct
licensing is installed or that the port is not configured as a loop port, a G_Port, or the port speed is
not set.
FIGURE 1
Simple port initialization process
The FCP auto discovery process enables private storage devices that accept the process login
(PRLI) to communicate in a fabric.
If device probing is enabled, the embedded port logs in (PLOGI) and attempts a PRLI into the device
to retrieve information to enter into the name server. This enables private devices that do not
perform a fabric login (FLOGI), but accept PRLI, to be entered in the name server and receive full
fabric citizenship. Private hosts require the QuickLoop feature which is not available in Fabric OS
v4.0.0 and later.
A fabric-capable device will register information with the Name Server during a FLOGI. These
devices will typically register information with the name server before querying for a device list. The
embedded port will still PLOGI and attempt PRLI with these devices.
To display the contents of a switch’s Name Server, use the
nsShow
or
nsAllShow
command. For
more information about these name server commands, refer to
Fabric OS Command Reference
.