Preview Tool

Cisco Bug: CSCta99181 - Diagnostic failure and boot loop with "diagnostic level power-on"

Last Modified

Feb 04, 2017

Products (1)

  • Cisco 7300 Series Routers

Known Affected Releases


Description (partial)


7300 NPEG100 fails diagnostics and is stuck in a boot loop following a crash or power cycle:

System Power On Diagnostics
DRAM Size ....................1024 MB
Testing DRAM..................Passed
Level2 Cache .................Present
Testing Level2 Cache (512  KB)
Read Miss Fails to fill Cache - CPU Cache Invalidation mechanism fails
Exp: 6B1A4D0 Got: 0 at Address 46B1A4D0
46B1A4D0/0, 46B1A4D4/1, 46B1A4D8/2, 46B1A4DC/3, 46B1A4E0/A6B1A4E0,
46B1A4E4/A6B1A4E4, 46B1A4E8/A6B1A4E8, 46B1A4EC/A6B1A4EC, Failed

System Bootstrap, Version 12.2(14r)SZ1, RELEASE SOFTWARE (fc1)
TAC Support:
Copyright (c) 2003 by cisco Systems, Inc.
C7300 platform with 1048576 Kbytes of main memory


This has been seen on a 7300 NPEG100 running IOS versions 12.2(33)SB5 and 12.2(33)SB6.  Only seen when power on diagnostics are enabled:

"diagnostic level power-on"
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.