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[MX/PTX] Major 'FPC x Voltage Tolerance Exceeded' alarm

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Article ID: KB36061 KB Last Updated: 22 Aug 2020Version: 1.0
Summary:

This document explains the meaning of the "FPC x Voltage Tolerance Exceeded " alarm and also suggests steps to overcome the issue.

Symptoms:

Active Alarm:

user@host> show chassis alarms
1 alarm currently active
Alarm time               Class  Description
2020-04-17 09:01:08 UTC  Major  FPC 2 Voltage Tolerance Exceeded

Log Messages:

Apr 17 09:01:08 2020  craftd[15077]:  Major alarm set, FPC 2 Voltage Tolerance Exceeded
Apr 17 09:01:08 2020  alarmd[16732]: Alarm set: CB color=RED, class=CHASSIS, reason=FPC 2 Voltage Tolerance Exceeded

Detailed Logs:

Apr 17 09:01:08 2020  craftd[15077]:  Major alarm set, FPC 2 Voltage Tolerance Exceeded
Apr 17 09:01:08 2020  alarmd[16732]: Alarm set: CB color=RED, class=CHASSIS, reason=FPC 2 Voltage Tolerance Exceeded
Apr 17 09:01:22 2020  edge3-la1-re0 craftd[15077]: Major alarm cleared, FPC 2 Voltage Tolerance Exceeded
Apr 17 09:18:22 2020  alarmd[16732]: Alarm set: CB color=RED, class=CHASSIS, reason=FPC 2 Voltage Tolerance Exceeded
Apr 17 09:18:22 2020  craftd[15077]: Receive FX craftd set alarm message: color: 1 class: 100 object: 143 slot: 2 silent: 0 short_reason=FPC 2 Voltage Failu long_reason=FPC 2 Voltage Tolerance Exceeded id=1946157711 reason=1946157056

Apr 17 09:18:22 2020  craftd[15077]:  Major alarm set, FPC 2 Voltage Tolerance Exceeded
Apr 17 09:18:38 2020  alarmd[16732]: Alarm cleared: CB color=RED, class=CHASSIS, reason=FPC 2 Voltage Tolerance Exceeded
Apr 17 09:18:38 2020  craftd[15077]: Major alarm cleared, FPC 2 Voltage Tolerance Exceeded

The log messages above indicate an exceeded voltage detection on FPC 2. This major alarm gets triggered when FPC 2 gets an out-of-range reading from the voltage sensor. Also, it indicates voltage failure logs for the specific FRU.

Cause:
  1. A transient issue with FPC
  2. FPC hardware issue
Solution:

Check FPC Type:

user@host >show chassis hardware

Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                XXXXX             JNP10008 [MX10008]
Midplane         REV 12   750-071974   XXXXXXXX          Midplane 8
Routing Engine 0          BUILTIN      BUILTIN           RE X10
Routing Engine 1          BUILTIN      BUILTIN           RE X10
CB 0             REV 15   750-079562   XXXXXXXX          Control Board
CB 1             REV 15   750-079562   XXXXXXXX          Control Board
FPC 0            REV 15   750-084779   XXXXXXXX          JNP10K-LC2101

For FPC type "JNP10K-LC2101" if this alarm is triggered, it does not necessarily indicate an issue with the hardware. The out-of-range sensor value causes by reading the voltage sensor while the sensor is not ready. The alarm is cleared when the software is able to get a correct reading from the sensor later on. In this case, the alarm usually sets and clears on its own and does not require reboot of the FPC. If there is a match to this FPC type, it is most likely the issue is not with the actual hardware. The alarm will self clear on its own. In corner cases when it does not, then you might need to consider the possibility of a hardware fault.

Check FPC state:

user@host> show chassis fpc
Temp  CPU Utilization (%)   CPU Utilization (%) Memory    Utilization (%)
Slot State            (C)  Total  Interrupt      1min   5min   15min DRAM (MB) Heap     Buffer
0  Empty
1  Online            52     19          0       16     16     16 3136       18         26
2  Offline         ---Bad Voltage---

Restart the FPC:

user@host> request chassis fpc (offline | online | restart) slot slot-number

Here,

user@host> request chassis fpc offline slot 2
user@host> request chassis fpc online slot 2

OR

user@host> request chassis fpc restart slot 2

If this solves the issue, you can ignore the next steps. If the issue still exists, continue on with the following steps.

Collect Host Logs:

Collect LCMD logs:

Apr 17 09:01:06 lcmd[31935]: ALARM [ SET -> Time: Apr 17 09:01:06, Name: FRU FPC 2, Short Reason: FPC 2 Voltage Failure , Long Reason: FPC 2 Voltage Tolerance Exceeded ]
Apr 17 09:01:11 lcmd[31935]: Health Debounce 1 [Fru: FPC 2 ID: 1202350500 Desc: VDDQ, voltage]
Apr 17 09:01:17 lcmd[31935]: Health Debounce 2 [Fru: FPC 2 ID: 1202350500 Desc: VDDQ, voltage]
Apr 17 09:01:22 lcmd[31935]: ALARM [ CLEAR -> Time: Apr 17 09:01:06, Name: FRU FPC 2, Short Reason: FPC 2 Voltage Failure , Long Reason: FPC 2 Voltage Tolerance Exceeded ]
 
Apr 17 09:18:21 lcmd[31935]: ALARM [ SET -> Time: Apr 17 09:18:21, Name: FRU FPC 2, Short Reason: FPC 2 Volta Failure , Long Reason: FPC 2 Voltage Tolerance Exceeded ]
Apr 17 09:18:27 lcmd[31935]: Health Debounce 1 [Fru: FPC 2 ID: 1202350500 Desc: VDDQ, voltage]
Apr 17 09:18:31 lcmd[31935]: Health Debounce 2 [Fru: FPC 2 ID: 1202350500 Desc: VDDQ, voltage]
Apr 17 09:18:36 lcmd[31935]: ALARM [ CLEAR -> Time: Apr 17 09:18:21, Name: FRU FPC 2, Short Reason: FPC 2 Voltage Failure , Long Reason: FPC 2 Voltage Tolerance Exceeded ]

These logs confirm voltage failure on FPC 2.

If the issue still persists post restart of FPC, this could be a possible issue with FPC or the slot. Please contact JTAC for detailed analysis and replacement if needed.

Collect the logs below for JTAC:

  • show log messages
  • show logs chassisd
  • VM Host Logs ( procedure above )
  • LCMD logs ( procedure above)
  • show chassis fpc detail
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