Description

This article discusses the following syslog message:

Vsensor 15:PF0 VDD Core 1.0V Beyond Margin

Symptoms

The following alarm appear on the a PTX1000 device:

root@router-name> show chassis alarms no-forwarding
1 alarms currently active
Alarm time               Class  Description
2021-06-22 11:47:50 UTC  Major  Vsensor 15:PF0 VDD Core 1.0V Beyond Margin


Messages in syslog/log:

Jun 22 11:47:50  router-name alarmd[16343]: %DAEMON-4: Alarm set: Volt Sensor color=RED, class=CHASSIS, reason=Vsensor 15:PF0 VDD Core 1.0V Beyond Margin
Jun 22 11:47:50  router-name craftd[16344]: %DAEMON-4: Receive FX craftd set alarm message: color: 1 class: 100 object: 150 slot: 15 silent: 0 short_reason= Vsensor 15 Beyond M long_reason=Vsensor 15:PF0 VDD Core 1.0V Beyond Margin id=33558422 reason=33554432
Jun 22 11:47:50  router-name craftd[16344]: %DAEMON-4:  Major alarm set, Vsensor 15:PF0 VDD Core 1.0V Beyond Margin

Solution

This alarm is an indication of PF chip utilizing more power than the specified amount.

  1. Check the output of "show chassis environment fpc":

       labroot@router-name> show chassis environment fpc    
       FPC 0 status:
       State                      Online
       Temperature                25 degrees C / 77 degrees F             
       Voltage:
        PE0 VDD Core 0.9V            924 mV
        PE0 HMC VDD 0.9V             908 mV
        PE0 HMC AVDD 1.2V           1199 mV
        PE1 VDD Core 0.9V            898 mV
        PE1 HMC VDD 0.9V             908 mV
        PE1 HMC AVDD 1.2V           1199 mV
        PE2 VDD Core 0.9V            899 mV
        PE2 HMC VDD 0.9V             908 mV
        PE2 HMC AVDD 1.2V           1199 mV
        HMC VDD 1.2V                1199 mV
        VDD 3.3V                    3299 mV
        PE0 AVDD 1.0V               1000 mV
        PE1 AVDD 1.0V                999 mV
        PE2 AVDD 1.0V               1000 mV
        PF0 AVDD 1.0V               1000 mV
        PF0 VDD Core 1.0V            949 mV <--This is the expected value, In problem state the value of voltage here would be any value greater than 1.0V
        CPE VDD 1.0V                1000 mV

  2. Once this alarm is raised, the system will initiate Fabric healing process to recover from Fabric chip.

  3. If the alarm appears again after the Fabric healing process is completed, contact your JTAC Representative for further assistance.