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Cisco Bug: CSCuj05643 - FNF alignment errors lead to high CPU

Last Modified

Apr 17, 2019

Products (100)

  • Cisco IOS
  • Cisco 861W Integrated Services Router
  • Cisco AS5400XM Universal Gateway
  • Cisco 1803 Integrated Services Router
  • Cisco 1812 Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 881SRSTW Integrated Services Router
  • Cisco 2951 Integrated Services Router
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Known Affected Releases

15.1(4)M 15.1(4)M3.2 15.2(4)M4.3

Description (partial)

Symptom: High CPU on ISR due to FNF alignment errors.
Conditions: This sympton is observed when FNF is configured. In order to recreate the defect, traffic needs to be flowing through a WAN link (PPP in the case of the defect) such that the packet data is on an unaligned boundary. If Ethernet is in play, then the issue will not occur.
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