Brocade Fabric OS Troubleshooting and Diagnostics Guide v6.2.0 (53-1001187-01, April 2009)

26 Fabric OS Troubleshooting and Diagnostics Guide

53-1001187-01

Link failures

Determining a successful negotiation

1. Enter the portCfgShow command to display the port speed settings of all the ports.

2. Enter the switchShow command to determine if the port has module light.

3. Determine whether or not the port completes speed negotiation by entering the portCfgSpeed

command. Then change the port speed to 1, 2, 4 or 8Gbps, depending on what speed can be

used by both devices. This should correct the negotiation by setting to one speed.

4. Enter the portLogShow or portLogDump command.

5. Check the events area of the output:

14:38:51.976 SPEE sn <Port#> NC 00000001,00000000,00000001

14:39:39.227 SPEE sn <Port#> NC 00000002,00000000,00000001

• sn indicates a speed negotiation.

• NC indicates negotiation complete.

If these fields do not appear, proceed to the step 6.

6. Correct the negotiation by entering the portCfgSpeed [slotnumber/]portnumber, speed_level

command if the fields in step 5 do not appear.

switch:admin> portcfgspeed

Usage: portCfgSpeed PortNumber Speed_Level

Speed_Level: 0 - Auto Negotiate

1 - 1Gbps

2 - 2Gbps

4 - 4Gbps

8 - 8Gbps

ax - Auto Negotiate + enhanced retries

Checking for a loop initialization failure

1. Verify the port is an L_Port.

a. Enter the switchShow command.

b. Check the comment 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 port state is online; otherwise, check for link failures.

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.

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.