If you are returning a device or component to Juniper Networks for repair or replacement, you must locate the serial number of the device or component. You must provide the serial number to the Juniper Networks Technical Assistance Center (JTAC) when you contact them to obtain a Return Materials Authorization (RMA). See Contacting Customer Support to Obtain a Return Materials Authorization for a QFX Series Device or Component.
If the device is operational and you can access the command-line interface (CLI), you can list serial numbers for the device and for some components with a CLI command. If you do not have access to the CLI or if the serial number for the component does not appear in the command output, you can locate the serial number ID label on the device or component.
![]() | Note: If you want to find the serial number ID label on a component, you need to remove the component from the device chassis, for which you must have the required parts and tools available. |
Use the show chassis hardware CLI operational-mode command to list the device and component serial numbers:
user@device> show chassis hardwareHardware inventory: Item Version Part number Serial number Description Chassis JN000TEST5 QFX3500 Routing Engine 0 BUILTIN BUILTIN QFX Routing Engine FPC 0 REV 05 750-036931 EE0823 QFX 48x10G 4x40G Switch CPU BUILTIN BUILTIN FPC CPU PIC 0 BUILTIN BUILTIN 48x 10G-SFP+ MGMT BRD REV 08 750-036946 EE0731 QFX3500-MB Power Supply 0 Rev 04 740-032091 UI00690 QFX PS 650W AC Power Supply 1 Rev 04 740-032091 UI00679 QFX PS 650W AC Fan Tray 0 QFX Fan Tray Fan Tray 1 QFX Fan Tray Fan Tray 2 QFX Fan Tray
![]() | Note: You must remove the fan tray to read the fan tray serial number from the serial number ID label. The fan tray serial number cannot be viewed through the CLI. Fan Tray 2 refers to the fan modules located in the management board. |
The chassis serial number ID label is located on a sliding panel to the right of the fan tray on a QFX3500 device. See Figure 1.
Figure 1: Location of the Serial Number ID Label on a QFX3500 Device

The power supplies, fan trays, and management board installed in QFX3500 devices are field-replaceable units (FRUs). For each FRU, you must remove the FRU from the device chassis to see the FRU serial number ID label.