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Cisco Bug: CSCub16372 - Very rarely, ISR-G2 IOS cannot boot up with certain ROMMON versions

Last Modified

Feb 08, 2017

Products (1)

  • Cisco 3900 Series Integrated Services Routers

Known Affected Releases

15.2(1)T3 15.2(3.16)M0.7

Description (partial)

Symptoms: In extremely rare cases, an ISR-G2 cannot boot up with certain ROMMON
versions with the error "Signature did not verify". So far, only one image is
found to have this problem: c3900-universalk9-mz.SPA.152-1.T3.bin.

Conditions: The issue will happen when all three conditions are met at the same

1. The platform is affected.
2. The ROMMON version running at the router is within the affected ROMMON 
version range.
3. The first calculated hash value is 0 during the IOS image building process.

Since it is extremely rare that the third condition will occur, so far only one
CCO image is found to have this problem.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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