Disabling Thermal Shutdown - Cisco Catalyst 9400 System Management Configuration Manual

Disabling Thermal Shutdown

Event
Chassis fan tray
experiences partial failure.
Chassis fan tray
experiences complete
failure.
Disabling Thermal Shutdown
Starting with the Cisco IOS XE Gibraltar 16.11.1 release, the option to manually disable the system thermal
shutdown has been introduced. This prevents the triggerring of the supervisor engine's action to turn off the
power supplies of the chassis even when the temperatures exceed the critical and shutdown temperatures. The
thermal shutdown disable feature allows you to bypass the system thermal shutdown process even when the
system has already reached the shutdown state.
Use the thermal shutdown disable command to configure the thermal shutdown disable option. Upon saving
the updated configuration to the start-up config, the system boots with the thermal shutdown disabled after
the next power-cycle or system reload.
Use the no thermal shutdown disable command to re-enable the system thermal shutdown feature.
The thermal shutdown disable feature does not fully support High Availibility. The following are two
unsupported cases:
• When thermal shutdown is disabled only on the active supervisor engine and if you boot the second
• When thermal shutdown is disabled on both supervisor engines and the system reaches a shutdown state,
The following table lists the possible combinations of the supervisor engine states and the thermal shutdown
disable configuration support for each of these states:
Table 23:
Active Supervisor
Shutdown State
Normal State
System Management Configuration Guide, Cisco IOS XE Bengaluru 17.4.x (Catalyst 9400 Switches)
226
Alarm Type
Minor
Major
supervisor engine when the system reaches a shutdown state, the system will still shut down.
if you re-enable the thermal shutdown feature, then the system will not shut down. The configuration
changes need to be saved to the start-up config and the switch needs to be reloaded for the changegs to
take effect.
Environmental Monitoring and Power Management
Supervisor LED Color
Orange
Red
Standby Supervisor
Shutdown State
Shutdown State
Description and Action
Syslog message displays
when the alarm is issued.
Syslog message displays
when the alarm is issued.
Support for Thermal Shutdown
Disable Configuration
• Not supported during boot-up
time.
• Supported during run time.
• Not supported during boot-up
time.
• Supported during run time.