Description

This article describes the PSU not-supported / unrecognized alarm, which may encounter on EX4300 devices.

Symptoms

Below is the sample example of PSU unsupported alarm seen on EX4300 devices:

root@S1> show chassis alarms no-forwarding

3 alarms currently active
Alarm time               Class  Description
2024-02-16 08:21:14 UTC  Major  FPC 1 PSU 0 Unrecognized for the platform
2024-02-16 08:17:09 UTC  Major  FPC 0 PSU 0 Unrecognized for the platform

Solution

EX4300 switches except EX4300-48MP and EX4300-48MP-S, switches support 350 W, 715 W, and 1100 W AC power supplies. EX4300-48MP and EX4300-48MP-S switches support 715 W, 1100 W, and 1400 W AC power supplies.

 

This can be verified in the output of "show chassis hardware" command and below is the sample output.

 

root@SKOGN1ZEBPUB01> show chassis hardware detail no-forwarding

Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                XXXXXXXXXXXX      Virtual Chassis
Routing Engine 0 REV 40   650-044936   XXXXXXXXXXXX      EX4300-24T
Routing Engine 1 REV 40   650-044936   XXXXXXXXXXXX      EX4300-24T
FPC 0            REV 40   650-044936   XXXXXXXXXXXX      EX4300-24T
  CPU                     BUILTIN      BUILTIN           FPC CPU
  PIC 0          REV 40   BUILTIN      BUILTIN           24x 10/100/1000 Base-T
  PIC 1          REV 40   BUILTIN      BUILTIN           4x 40GE QSFP+
    Xcvr 0       REV 01   740-038624   XXXXXXXXXXXXXX    QSFP+-40G-CU3M
    Xcvr 1       REV 01   740-038624   XXXXXXXXXXXXXX    QSFP+-40G-CU3M
  Power Supply 0 REV 03   740-074873   XXXXXXXXXXX       JPSU-1400W-AC-AFO
  Power Supply 1 REV 04   740-046873   XXXXXXXXXXX       JPSU-350-AC-AFO-A
  Fan Tray 0                                             Fan Module, Airflow Out (AFO)
  Fan Tray 1                                             Fan Module, Airflow Out (AFO)
FPC 1            REV 40   650-044936   XXXXXXXXXXXX      EX4300-24T
  CPU                     BUILTIN      BUILTIN           FPC CPU
  PIC 0          REV 40   BUILTIN      BUILTIN           24x 10/100/1000 Base-T
  PIC 1          REV 40   BUILTIN      BUILTIN           4x 40GE QSFP+
    Xcvr 0       REV 01   740-038624   XXXXXXXXXXXXXX    QSFP+-40G-CU3M
    Xcvr 1       REV 01   740-038624   XXXXXXXXXXXXXX    QSFP+-40G-CU3M
  Power Supply 0 REV 03   740-074873   XXXXXXXXXXX       JPSU-1400W-AC-AFO
  Power Supply 1 REV 04   740-046873   XXXXXXXXXXX       JPSU-350-AC-AFO-A
  Fan Tray 0                                             Fan Module, Airflow Out (AFO)
  Fan Tray 1                                             Fan Module, Airflow Out (AFO)

 

The alarm that we are seeing is for PSU0 for both FPCs, this is because the model EX4300-24T supports on 350 W, 715 W, and 1100 W AC power supplies, hence PSU 0 with 1400W is not supported on EX4300-24T.

 

Under such conditions, replacing the 1400W PSU with any 350 / 715 / 1100 W AC power supplies will clear the chassis alarms.

 

Please refer below article for more information: https://www.juniper.net/documentation/us/en/hardware/ex4300/topics/topic-map/ex4300-power-system.html#power-supply-ex4300-ac

Modification History

2024-02-25 : Article Created
2024-03-09: Article validated.

Related Information

https://www.juniper.net/documentation/us/en/hardware/ex4300/topics/topic-map/ex4300-power-system.html#power-supply-ex4300-ac