Modular Switches

On modular switches, each I/O module and MSM/MM has its own temperature sensor, normal temperature range and minimum and maximum temperature threshold, and status. See the show temperature command for information about each module.
  • If the temperature on any I/O module or MSM is out of its normal range, an error message is logged. The Status column in show temperature shows Warning.

  • If the temperature on any I/O module or MSM was out of normal range, then returns back to its normal range, a Notice message is logged. The Status column in show temperature shows Normal.

  • If the temperature on any I/O module is above its maximum allowed, or below its minimum allowed, that I/O module is powered down and marked Failed in show slot, and Error in show temperature.

  • If the temperature on any MSM is above its maximum allowed, or below its minimum allowed, that MSM is marked FAIL (OverHeat) in show switch, Failed in show slot, and Error in show temperature. If that MSM was the primary, the other MSM becomes primary. MSMs out of allowed temperature range are not powered down (by hardware design), nor are they rebooted.

  • Beyond the mechanisms above, you can use the UPM feature to take any further desired actions when an I/O module or MSM overheats.