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Cisco Bug: CSCup18799 - ISR 4451-X Silent Reload due to Power Supply Signal Noise

Last Modified

Mar 23, 2020

Products (1)

  • Cisco 4000 Series Integrated Services Routers

Known Affected Releases


Description (partial)

ISR4451-X router may reload silently. Last reset reason will be recorded as "PowerOn".

Example output from 'show version':

ISR4451 uptime is 14 minutes
Uptime for this control processor is 17 minutes
System returned to ROM by reload
System restarted at 06:04:27 CDT Wed Jul 2 2014
System image file is "bootflash:/isr4400-universalk9.03.10.02.S.153-3.S2-ext.SPA.bin";;
Last reload reason: PowerOn

This applies  to ISR4451-X  and ISR 4431 platforms. It does not apply to PowerOn reloads on other IOS or IOS-XE platforms.

This issue is suspected to be triggered by AC noise on the circuit(s) supplying the router. 

The problem may be more likely to occur when the router is connected to one or more uninterruptible power supply (UPS) and/or power distribution unit (PDU) devices. However, it has also been seen when the router was powered directly from 'wall power'.

Related Community Discussions

ISR4451-X でサイレントリロードが発生する
2015年3月23日(改訂版) TAC SR Collection 主な問題 ソフトウェア、またはハードウェア障害などにより予期しない再起動が発生する場合、一般的にIOS-XEルータでは crashinfo や core ファイルがファイルシステム上に生成されますが、ISR4451-X ではそれらのファイルが生成されずに予期しない再起動が発生することがあります。この症状が発生後は show version の出力内容が以下のように電源 off/on を行ったかのようなものになります。 | Router# show version Cisco IOS XE Software, Version 03.10.01.S - Extended Support Release  (中略) ISR4400 uptime is 1 minute Uptime for this control processor is 4 minutes System returned to ROM by reload System image file is "bootflash:packages.conf" Last ...
Latest activity: Feb 15, 2015
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