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How to locate the serial number for a QFX3500 chassis

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Article ID: KB31563 KB Last Updated: 05 Apr 2021Version: 2.0
Summary:

For the QFX3500 platform, there may be a difference between the chassis serial number and the Flexible PIC Concentrator (FPC) serial number. The FPC serial number will be used to form a Virtual Chassis (VC)/Virtual Chassis Fabric (VCF).

In this case, after VC/VCF is formed, 'show chassis hardware' will display only FPC serial number, not the chassis serial number.

Symptoms:

There are two SN format for QFX3500:

  1. Chassis SN with PXXXX and FPC SN with BBAKXXXX. This is mostly for older units ( REV 11 or earlier)
  2. Chassis SN with PXXXX and FPC SN with PXXXX-C. This is mostly for newer units. ( REV 15 or later)

The command, ‘show chassis hardware’ will display both the chassis AND the FPC serial numbers for standalone QFX3500.

root> show chassis hardware
Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                P0204             QFX3500
Pseudo CB 0
Routing Engine 0          BUILTIN      BUILTIN           QFX Routing Engine
FPC 0            REV 09   750-036931   BBAK8704          QFX3500-48S4Q
  CPU                     BUILTIN      BUILTIN           FPC CPU
  PIC 0                   BUILTIN      BUILTIN           48x 10G-SFP+
  PIC 1                   BUILTIN      BUILTIN           4x 40G-QSFP+
    Xcvr 0       REV 01   740-032986   QA460315          QSFP+-40G-SR4
    Xcvr 1       REV 01   740-032986   QA460318          QSFP+-40G-SR4
  MGMT BRD       REV 05   750-036946   BBAK8652          QFX3500-MGMT-RJ45-AFI
Power Supply 0
Power Supply 1
Fan Tray 0                                               QFX3500 Fan Tray, Front to Back Airflow
Fan Tray 1                                               QFX3500 Fan Tray, Front to Back Airflow
Fan Tray 2                                               QFX3500 Fan Tray, Front to Back Airflow
 
{master:0}
root>
{master:0}

'show virtual-chassis' will display only the FPC serial number for standalone devices . This serial number will be used to form a VC/VCF in pre-provisioned mode.

root> show virtual-chassis
 
Virtual Chassis ID: 6986.2afe.b198
Virtual Chassis Mode: Enabled
                                                Mstr           Mixed Route Neighbor List
Member ID  Status   Serial No    Model          prio  Role      Mode  Mode ID  Interface
0 (FPC 0)  Prsnt    BBAK8704     qfx3500s       128   Master*      N  VC
virtual-chassis {
      preprovisioned;
      no-split-detection;
      member 0 {
           role routing-engine;
           serial-number BBAK8704;
      member 1 {
           role routing-engine;
           serila-number P2020;



root@boa-te-3500v> show virtual-chassis status


Preprovisioned Virtual Chassis
Virtual Chassis ID: 25f2.bb72.5ddb
Virtual Chassis Mode: Enabled
                                                Mstr           Mixed Route Neighbor List
Member ID  Status   Serial No    Model          prio  Role      Mode  Mode ID  Interface
0 (FPC 0)  Prsnt    BBAK8704     qfx3500s       129   Master*      N  VC   1  vcp-255/1/0  
                                                                           1  vcp-255/1/1
                                                                           1  vcp-255/1/2
                                                                           1  vcp-255/1/3
1 (FPC 1)  Prsnt    P2020-C      qfx3500s       129   Backup       N  VC   0  vcp-255/1/1
                               0  vcp-255/1/0
                                                                           0  vcp-255/1/2
                                                                           0  vcp-255/1/3

If the device has a different SN for the chassis, and the FPC is not primary in VC/VCF, 'show virtual-chassis status' and 'show chassis hardware' will display only the FPC serial number, not the chassis. serial number.

Solution:

The following method can be used to retrieve chassis SN of individual FPC.

  1. Gather complete 'show chassis hardware extensive' from the primary RE of the VC/VCF system.
  2. Locate the hex value of chassis SN. (Address 0x74-0x78)
  3. Convert the hex value to ASCII. (can use online tools such as: http://www.rapidtables.com/convert/number/hex-to-ascii.htm)

Example (Aunit from JTAC lab (Chassis SN:P0822 / FPC SN: BBAK1186):

 FPC 1            REV 11   750-036931   BBAK1186          QFX3500-48S4Q
 Jedec Code:   0x7fb0            EEPROM Version:    0x02
 P/N:          750-036931        S/N:               S/N BBAK1186
 Assembly ID:  0x09a5            Assembly Version:  02.11
 Date:         05-21-2011        Assembly Flags:    0x00
 Version:      REV 11            CLEI Code:         CMMFX00BRA
 ID: QFX3500-48S4Q               FRU Model Number:  QFX3500-48S4Q
 Board Information Record:
  Address 0x00: ad 01 01 04 84 18 88 d5 2c 24 ff ff ff ff ff ff
 I2C Hex Data:
  Address 0x00: 7f b0 02 ff 09 a5 02 0b 52 45 56 20 31 31 00 00
  Address 0x10: 00 00 00 00 37 35 30 2d 30 33 36 39 33 31 00 00
  Address 0x20: 53 2f 4e 20 42 42 41 4b 31 31 38 36 00 15 05 07
  Address 0x30: db ff ff ff ad 01 01 04 84 18 88 d5 2c 24 ff ff
  Address 0x40: ff ff ff ff 01 43 4d 4d 46 58 30 30 42 52 41 51
  Address 0x50: 46 58 33 35 30 30 2d 34 38 53 34 51 00 00 00 00
  Address 0x60: 00 00 00 00 00 00 42 00 00 ff ff ff ff ff ff ff
  Address 0x70: ff ff ff 11 50 30 38 32 32 00 00 00 00 00 00 00

 

  • Address 0x74-0x78 is "50 30 38 32 32"
  • Convert to ASCII is "P0822"

 

The 'show chassis hardware' command should be executed from primary only. If issued from other members, it will be incomplete.

Modification History:
2021-03-25: Updated the article terminology to align with Juniper's Inclusion & Diversity initiatives.
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