Brocade Communications Systems Fabric OS v7.1.0, Troubleshooting Manual

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Fabric OS Troubleshooting and Diagnostics Guide 25
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Link issues
3
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 LEDs purpose and
explains the current behavior as well as provides suggested resolutions.
Symptom Port LEDs are steady.
Probable cause and recommended action
The color of the port LED is important in this instance. 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 LEDs purpose and explains the current behavior as well as
provides suggested resolutions.
Symptom No light from the port LEDs.
Probable cause and recommended action
If there is no light coming from the port LED, then no signal is being detected. Check your cable and
SFP to determine the physical fault.
Connection problems
Determine if the problem is the target or the host, then continue to divide the suspected
problem-path in half until you can pinpoint the problem. One of the most common solutions is
zoning. Verify that the host and target are in the same zone. For more information on zoning, refer
to
Chapter 9, “Zoning” .
Checking the physical connection
•
Check the cables running to and from the host and storage to the switch.
This path includes the patch panel. Verify that none of the cables are damaged, including
indentations or bent cable.
•
Check the SFP on the HBAs and switches.
Verify that they are known to be in good working condition. You can do this by swapping the
current SFP with a known good working SFP.
•
Clean the optics.
There are many kits on the market for cleaning fiber optics. You want to find a product that
does not leave residue either from a lint-free wipe or from the solvent.