Fabric OS Troubleshooting and Diagnostics Guide 29
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Link failures
3
Checking for a loop initialization failure
1. Verify the port is an L_Port.
a. Enter the switchShow command.
b. Check the last field of the output to verify that the switch port indicates an L_Port. If a loop
device is connected to the switch, the switch port must be initialized as an L_Port.
c. Check to ensure that the state is online; otherwise, check for link failures.
Example of an online L_Port
Area Port Media Speed State Proto
=====================================
(output truncated)
66 66 -- N8 No_Module
67 67 id AN No_Sync
68 68 id N2 Online L-Port 13 public
2. Verify that loop initialization occurred if the port to which the loop device is attached does not
negotiate as an L_Port.
a. Enter the portLogShow or portLogDump command to display the port log for all ports on
the switch; or if you are looking for a specific port, enter the portLogDumpPort command.
b. Check argument number four for the loop initialization soft assigned (LISA) frame
0x11050100.
switch:admin> portlogdumpport 4
time task event port cmd args
-----------------------------------------------------------------
11:40:02.078 PORT Rx3 23 20 22000000,00000000,ffffffff,11050100
Received LISA frame
The LISA frame indicates that the loop initialization is complete.
3. Skip point-to-point initialization by using the portCfgLport Command.
The switch changes to point-to-point initialization after the LISA phase of the loop initialization.
This behavior sometimes causes trouble with old HBAs.
Checking for a point-to-point initialization failure
1. Enter the switchShow command to confirm that the port is active and has a module that is
synchronized.
If a fabric device or another switch is connected to the switch, the switch port must be online.
2. Enter the portLogShow or portLogDump commands.
3. Verify the event area for the port state entry is pstate. The command entry AC indicates that
the port has completed point-to-point initialization.
switch:admin> portlogdumpport 4
time task event port cmd args
-------------------------------------------------
11:38:21.726 INTR pstate 4 AC
4. Skip over the loop initialization phase.
