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McDATA 4416 Fibre Channel Switch Module Installation Guide
4-4
Logged-In LED Indications
Excessive Port Errors
The switch can monitor a set of port errors and generates alarms based on
user-defined sample windows and thresholds. These port errors include the
following:
•CRC errors
• Decode errors
• ISL connection count
•Login errors
• Logout errors
• Loss-of-signal errors
Port threshold alarm monitoring is disabled by default. Refer to the McDATA
Switch Module Management Guide for information about managing port
threshold alarms.
If the count for any of these errors exceeds the rising trigger for three
consecutive sample windows, the switch generates an alarm and disables the
affected port, changing its operational state to “down”. Port errors can be
caused by the following:
• Triggers are too low or the sample window is too small
• Faulty Fibre Channel port cable
• Faulty SFP
• Faulty port
• Fault device or HBA
Review the event browser to determine if excessive port errors are
responsible for disabling the port. Look for a message that mentions one of
the monitored error types indicating that the port has been disabled, then do
the following:
1. Examine the alarm configuration for the associated error using the Show
Config Threshold command or the McDATA Embedded Web Server
application. Refer to the McDATA 4416 Command Line Interface Guide for
information about this command. Are the thresholds and sample window
correct?
•Yes - Continue
• No - Correct the alarm configuration. If the condition remains,
continue.
2. Reset the port, then perform an external port loopback test to validate the
port and the SFP. Refer to the McDATA Switch Module Management Guide
for information about testing ports. Does the port pass the test?
•Yes - Continue
• No - Replace the SFP and repeat the test. If the port does not pass the
test, contact your authorized maintenance provider. Otherwise
continue.