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

Fabric OS Troubleshooting and Diagnostics Guide 29
53-1001187-01
Device login issues
3
5. Run the portLoopbackTest on the marginal port. You will need an adapter to run the loopback
test for the SFP. Otherwise, run the test on the marginal port using the loopback mode lb=5.
Use the different modes shown in Table 5 to test the port. See the Fabric OS Command
Reference for additional information on this command.
6. Check the results of the loopback test and proceed as follows:
• If the loopback test failed, the port is bad. Replace the port blade or switch.
• If the loopback test did not fail, the SFP was bad.
7. Perform the following steps to rule out cabling issues:
a. Insert a new cable in the suspected marginal port.
b. Enter the portErrShow command to determine if a problem still exists.
• If the portErrShow output displays a normal number of generated errors, the issue is
solved.
• If the portErrShow output still displays a high number of generated errors, follow the
troubleshooting procedures for the Host or Storage device in the following section,
“Device login issues”.
Device login issues
A correct login is when the port type matches the device type that is plugged in. In the example
below, it shows that the device connected to Port 1 is a fabric point-to-point device and it is
correctly logged in an F_Port.
brcd5300:admin> switchshow
switchName:brcd5300
switchType:64.3
switchState:Online
switchMode:Native
switchRole:Subordinate
switchDomain:1
switchId:fffc01
switchWwn:10:00:00:05:1e:40:ff:c4
zoning:OFF
switchBeacon:OFF
FC Router:OFF
FC Router BB Fabric ID:1
Area Port Media Speed State Proto
=====================================
0 0 -- N8 No_Module
1 1 -- N8 No_Module
2 2 -- N8 No_Module
3 3 -- N8 No_Module
4 4 -- N8 No_Module
5 5 -- N8 No_Module
6 6 -- N8 No_Module
7 7 -- N8 No_Module
8 8 -- N8 No_Module
9 9 -- N8 No_Module
10 10 -- N8 No_Module
11 11 -- N8 No_Module
12 12 -- N8 No_Module