Dell Brocade G620 Brocade 8.0.1 Fabric OS Troubleshooting and Diagnostics Guid - Page 36

Link issues, nsShow, nsAllShow

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FIGURE 2 Simple port initialization process Connectivity 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 commences with port login (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. A fabric-capable device registers information with the Name Server during a FLOGI. These devices typically register information with the Name Server before querying for a device list. The embedded port will still conduct 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 the Fabric OS Command Reference. Link issues Symptom Probable cause and recommended action Port LEDs are flashing. Depending on the rate of the flash and the color of the port LED, this could mean several things. To determine what is happening on either your port status LED or power status LED, refer to that switch's model hardware reference manual. There is a table that describes the purpose of the LEDs and explains the current behavior as well as suggested resolutions. Brocade Fabric OS Troubleshooting and Diagnostics Guide 36 53-1004126-01

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FIGURE 2
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 commences with port login (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.
A fabric-capable device registers information with the Name Server during a FLOGI. These devices typically register information with the
Name Server before querying for a device list. The embedded port will still conduct 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 the
Fabric OS Command Reference
.
Link issues
Symptom
Port LEDs are flashing.
Probable cause and recommended action
Depending on the rate of the flash and the color of the port LED, this
could mean several things. To determine what is happening on either your
port status LED or power status LED, refer to that switch’s model
hardware reference manual. There is a table that describes the purpose of
the LEDs and explains the current behavior as well as suggested
resolutions.
Connectivity
Brocade Fabric OS Troubleshooting and Diagnostics Guide
36
53-1004126-01