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However, the device will not accept the following values because the low
temperature threshold for the high speed (73° C) is higher than the high
temperature threshold (72° C) for the medium-high speed.
Table 22. Unacceptable settings for low temperature thresholds and high fan speed
Fan Speed
Low Temperature Threshold
High
73° C
Medium-high
57° C
The <high-threshold> temperature for the high fan speed (speed-4) is the shutdown
temperature. If a thermal plane's fan-controlled temperature reaches and stays at
the shutdown temperature for five minutes, the device will automatically shut down
to prevent damage.
Displaying temperature thresholds for thermal planes and fan speeds: To
check the current settings of the low and high temperature thresholds for thermal
planes and fan speeds, enter the show chassis command at any level of the CLI.
The following shows an example of the show chassis command output on the
B08S. The display is similar on the B16S. This display shows the currently
configured temperature thresholds for the management module(s) (Rule 1/3), all of
the interface modules (Rule 2/3), and the switch fabric modules (Rule 3/3).
# show chassis
...
Fan speed switching temperature thresholds:
Rule 1/3 (MGMT CARDS THERMAL PLANE):
Speed 1: NM<----->57 deg-C
Speed 2: 48<----->58 deg-C
Speed 3: 49<----->59 deg-C
Speed 4: 50<----->80 deg-C (shutdown)
Rule 2/3 (LINE CARDS THERMAL PLANE):
Speed 1: NM<----->57 deg-C
Speed 2: 48<----->58 deg-C
Speed 3: 49<----->59 deg-C
Speed 4: 50<----->80 deg-C (shutdown)
Rule 3/3 (SWITCH FABRIC CARDS THERMAL PLANE)***active***:
Speed 1: NM<----->57 deg-C
Speed 2: 48<----->58 deg-C
Speed 3: 49<----->59 deg-C
Speed 4: 50<----->80 deg-C (shutdown)
Syntax: show chassis
Shutdown warning messages
If any thermal plane exceeds the shutdown temperature level, the device will
display a shutdown warning message on the console every five seconds until either
the temperature level goes back down below the shutdown temperature level, or the
system shuts down the chassis to prevent further damage (shutdown occurs after
five minutes of exceeding the shutdown temperature level).
The shutdown warning messages indicate the thermal plane that triggered the
warning and the number of seconds before the device will shut down. The following
shows an example warning message:
!!! Temperature of SWITCH FABRIC CARDS THERMAL PLANE is over shutdown level, system
is going to be shutdown in 300 seconds !!!
High Temperature Threshold
82° C
72° C
Chapter 5. Managing the Chassis and Modules
67
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