This article discusses the following syslog message:

Vsensor 4:PE1 HMC VDD 0.9V Beyond Margin

The following alarm appear on the a PTX1000 device:

root@Router> show chassis alarms no-forwarding

2 alarms currently active

Alarm time        Class Description

2024-02-05 01:45:30 PST Major FPC 0 Major Errors

2024-02-05 01:45:29 PST Major Vsensor 4:PE1 HMC VDD 0.9V Beyond Margin

Messages in syslog/log:

Feb 5 01:45:29.164 Router craftd[20946]: Receive FX craftd set alarm message: color: 1 class: 100 object: 150 slot: 0 silent: 0 short_reason=Vsensor 4 Beyond Ma long_reason=Vsensor 4:PE1 HMC VDD 0.9V Beyond Margin id=37748886 reason=33554432

Feb 5 01:45:29.164 Router craftd[20946]: Major alarm set, Vsensor 4:PE1 HMC VDD 0.9V Beyond Margin

Feb 5 01:45:29.169 Router fpc0 ISSUING ifd-down for et-0/0/59 (450) on pfe-1 

Feb 5 01:45:29.164 Router alarmd[20945]: Alarm set: Volt Sensor id=37748886, color=RED, class=CHASSIS, reason=Vsensor 4:PE1 HMC VDD 0.9V Beyond Margin

Feb 5 01:45:29.172 Router fpc0 pechip_set_pfe_disabled:976: PECHIP[1]: PFE Marked Disabled !!! 

Feb 5 01:45:29.172 Router fpc0 pechip_set_pfe_disabled:983: PECHIP[1]: Deregisterd TOE PIO Vectors !!! 

Feb 5 01:45:29.172 Router fpc0 JPRDS_FDB:ERR:jprds_fdb_set_pfe_disabled(),8876: pfe 1 marked disabled  

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

Check the output of "show chassis environment fpc":

root@Router> show chassis environment no-forwarding

Class Item              Status   Measurement

Power Power Supply 0         OK     27 degrees C / 80 degrees F

   Power Supply 1         OK     26 degrees C / 78 degrees F

   Power Supply 2         OK     26 degrees C / 78 degrees F

   Power Supply 3         OK     28 degrees C / 82 degrees F

Temp FPC 0 Intake Temp Sensor    OK     25 degrees C / 77 degrees F

   FPC 0 PFE1-HMC0-DIE      OK     0 degrees C / 32 degrees F ------> Here temp is 0 for all PFE1-HMC

   FPC 0 PFE1-HMC0-TOP      OK     0 degrees C / 32 degrees F

   FPC 0 PFE1-HMC0-BOT      OK     0 degrees C / 32 degrees F

   FPC 0 PFE1-HMC1-DIE      OK     0 degrees C / 32 degrees F

   FPC 0 PFE1-HMC1-TOP      OK     0 degrees C / 32 degrees F

   FPC 0 PFE1-HMC1-BOT      OK     0 degrees C / 32 degrees F

   FPC 0 PFE1-HMC2-DIE      OK     0 degrees C / 32 degrees F

   FPC 0 PFE1-HMC2-TOP      OK     0 degrees C / 32 degrees F

   FPC 0 PFE1-HMC2-BOT      OK     0 degrees C / 32 degrees F

2- Once this alarm is raised, the system will initiate the fabric healing process to recover from the fabric chip. Power cycle the router in the case of the PTX1000.

3- If the alarm exists after the power cycle of the router, it is an indication of an issue with one of the power components on the board. The issue could be with a power component called MOS-FET (transistor). This needs an RMA of the chassis.