This is article expains how to deal with the alarm "Host X PCI Device not responding 0x14e4:0xb046"

You will observe the below alarm on the device.

root@R1_Router> show chassis alarms

2 alarms currently active

Alarm time Class Description

2025-07-17 02:09:56 UTC Major FPC 0 Major Errors

2025-07-17 02:06:50 UTC Major Host 0 PCI Device not responding 0x14e4:0xb046

On certain VMhost platforms, major chassis alarms "Major Host 0 PCI Device not responding 0x14e4:0xb046" are seen after a software upgrade from releases prior to 21.4 (19.4 for example) to 21.4 onwards. 

Services will be partially impacted post reboot if igb (1GB) interface is used instead of i40e interfaces (10GE) for RE to PFE (Packet Forwarding Engine) traffic.

On PTX10002-60C/QFX10002-60C, after the system is rebooted, the "FPC 0 Major Errors" alarm might be seen due to a rare timing issue. 

The issue could cause the host path traffic to get dropped. It is a rare issue and does not always happen during reboot. Please try to perform "request vmhost reboot" for recovery.

Triggers

This issue might be seen if the following conditions are met:

* VMhost platforms. 

* VMhost reboot.

* The system is rebooted.

* VMhost software upgrade from releases prior to 21.4 to release 21.4 onwards.

* On PTX10002-60C/QFX10002-60C platform.