We recommend that you change the air filter every three months. However, examine the air filter once a month
(or more often in dusty environments) and replace it if it appears to be excessively dirty or damaged. To
comply with Telecordia GR-63-Core standard air filter requirements for NEBS deployments, the air filter
must be replaced, not cleaned
Note
Troubleshooting the Switching Module
Each switching module has one STATUS LED that provides information about the module and one numbered
PORT LINK LED for each port on the module. Refer to Cisco Catalyst 9400 Series Switching Module LEDs,
on page 134 to determine the status of the LEDs.
Useful Cisco IOS Commands - Switching Modules
The show module command provides information that is useful in solving problems with ports on individual
modules.
Some problems can be solved by resetting the switching module. Power cycle the chassis - this resets, restarts,
and power cycles the switching module.
Troubleshooting Supervisor Modules
This section only addresses problems with hardware. Problems with features or configuration are not covered
here. Refer for your software configuration guide and release notes for information on configuring features
or identifying known problems.
Supervisor Module LEDs
• Check the LEDs on your supervisor and compare them to the described LED behaviors. See Cisco
Catalyst 9400 Series Supervisor Module LEDs, on page 135
• The Supervisor Module STATUS LED turns either amber or red under the following conditions:
• Power supply failure (not the same as removal of power supply)
• Power supply fan failure
• Removal or failure of fan tray
• Mismatched power supplies in the chassis
Standby Supervisor Engine Problems
• Switch# show module
If the standby supervisor module is not online or status indicates “other” or “faulty” in the output of the
show module command or an amber status LED, create a console connection to the standby supervisor
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
111
Troubleshooting
Troubleshooting the Switching Module
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