Description

This article describes the case where the output of "show chassis hardware" displays incomplete or half of the actual S/N of FPC 0 and the solution to resolve it.

Symptoms

Customer noticed a strange issue with a EX4400-48P switch. The output of show chassis hardware was displaying only half of the S/N of FPC0. The issue occurred after customer upgraded software to Junos 22.3R2-S2.10. 
Therefore when customer tries to add configuration for virtual chassis, it is giving below error.


Output of show chassis hardware :

Hardware inventory:

Item Version Part number Serial number Description
Chassis ZDXXXXX852 EX4400-48P          >>>> Correct chassis S/N 
Pseudo CB 0
Routing Engine 0 BUILTIN BUILTIN RE-EX4400-48P
FPC 0 114383 83 ZDXXXXX8 EX4400-48P         >>>> FPC 0 S/N is truncated

When customer adds virtual chassis information (customer tried with both S/N ZDXXXXX8 and ZDXXXXX852), both are returning an error since FPC0 and chassis S/N are not matching.

 

user@switch# show | compare 

[edit]

+ virtual-chassis {

+   preprovisioned;

+   no-split-detection;

+   member 0 {

+     role routing-engine;

+     serial-number ZDXXXXX8;

+   }

+ }


{master:0}[edit]

user@switch# commit 

[edit virtual-chassis]

 'member'

  Member's information missing from provisioning database

error: configuration check-out failed

Solution

CFTS performed the Junos upgrade as per the customer MOP in CFTS lab and the issue was not seen on the lab device. 
Rebooting the device does not resolve the issue.

We recommended customer to format install the device. After performing format install, the output of "show chassis hardware" displayed the correct serial number of FPC and customer was able to commit the virtual chassis configuration without any errors.

This issue seems to be transient and format install resolves the issue.

Modification History

2024-02-29 : Article Created
2024-03-08: Masked the S/N