The alarm indicates the Multiple FRUs of corresponding zone in the chassis (in an MX2020 or MX2010) having issues with allocating power or having issue with Power supplies to FRUs for specific zone

There are a total of eighteen AC power supply modules (PSMs) located at the rear of the chassis in slots PSM0 through PSM8 (bottom), and slots PSM9 through PSM17 (top) (left to right).

Here is a breakdown of the AC power distribution:

• The AC PSMs in slots PSM0 through PSM8 provide power to the lower fan trays (0, 1, and upper 2), and MPCs in slot 0 through 9, CB-REs in slot 0 and 1, and SFBs in slot 0 through 7.

• The AC PSMs in slots PSM9 through PSM17 provide power to the upper fan trays upper (2, 3, and lower 0), and MPCs in slot 10 through 19, CB-REs in slot 0 and slot 1, and SFBs in slot 0 through 7.

The MX2000 line of routers supports a three-phase delta AC power system, a three-phase wye AC power system, or a single-phase AC power system.

The Below chassis alarm is observed when the Major alarm is raised

User@re0> show chassis alarms no-forwarding

1 alarms currently active

Alarm time               Class  Description

2023-10-25 04:37:20 BST  Major  Too many supplies missing in Upper zone

The MX2020 chassis has two power zones - Upper Zone & Lower Zone. Both zones should be independently capable of providing N+1 power redundancy.

Sample :

System:

 Upper Zone:

   Capacity:              5000 W (maximum 5000 W)

   Allocated power:       2835 W (2165 W remaining)

   Actual usage:          1381.38 W

 Lower Zone:

   Capacity:              17500 W (maximum 17500 W)

   Allocated power:       8896 W (8604 W remaining)

   Actual usage:          4040.31 W

 Total system capacity:  22500 W (maximum 22500 W)

 Total remaining power:  10769 W

Messages :

Oct 25 04:37:20.667 2023  alarmd[25723]: %DAEMON-4: Alarm set: Power Supply id=-2147483521, color=RED, class=CHASSIS, reason=Too many supplies missing in Upper zone

Oct 25 04:37:20.667 2023  craftd[11536]: %DAEMON-4:  Major alarm set, Too many supplies missing in Upper zone

Kindly collect the output for the below :

‘show chassis power detail’

Kindly Verify the Capacity and allocated Power for the affected zone should be on lower in problematic state

lab@> show chassis environment no-forwarding

Class Item                           Status     Measurement
Temp  PSM 0                          OK         28 degrees C / 82 degrees F
      PSM 1                          OK         28 degrees C / 82 degrees F
      PSM 2                          OK         28 degrees C / 82 degrees F
      PSM 3                          OK         30 degrees C / 86 degrees F
      PSM 4                          Check
      PSM 5                          Check
      PSM 6                          OK         33 degrees C / 91 degrees F
      PSM 7                          OK         28 degrees C / 82 degrees F
      PSM 8                          OK         28 degrees C / 82 degrees F
      PSM 9                          Check
      PSM 10                         Check
      PSM 11                         Check
      PSM 12                         Check
      PSM 13                         OK         38 degrees C / 100 degrees F
      PSM 14                         OK         35 degrees C / 95 degrees F
      PSM 15                         Check
      PSM 16                         Check
      PSM 17                         Check


Contact Support to perform a check for the status of power supplies of PSM and other FRUs for the specified zone reflecting the Major alarm

Initial Draft -29/12/2023