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Cisco Bug: CSCvt97607 - 9736C-FX imposing two FCS headers on RX frames after link flap

Last Modified

Jul 21, 2020

Products (61)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 92160YC-X Switch
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Known Affected Releases

7.0(3)I7(7)

Description (partial)

Symptom:
A Cisco Nexus 9500 Series Switch with 9736C-FX line cards might experience a condition in which all ingress traffic on a port incorrectly has two FCS's appended to the end of the frame instead of one.  Both the outer and inner FCS calculations will be valid, so traffic will not be dropped unless the four extra bytes of FCS causes traffic to exceed MTU, or if a given protocol performs length validity checks on frames.

Conditions:
LC N9K-X9736C-FX with bootup diagnostic level set to complete (default setting)
Affected NXOS Versions 7.0(3)I7(7), 7.0(3)I7(8), 9.3(1), 9.3(2)
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
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