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Cisco Bug: CSCuo93903 - N7k:Packets of specific sizes are getting dropped on F3 Interface

Last Modified

Nov 27, 2020

Products (8)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 6-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(10)S42 6.2(6a)

Description (partial)

Packets with IP payload between 1497 to 1500 are dropped on the F3 interface with default MTU of 1500 on ports with Dot1q tag. This behavior can also be seen with a non-default MTU.

Switch running 6.2.6a or later.
Drops seen on F3 module on port with dot1q Tags (input errors/giants).
ISSU was done from 6.2.6 to 6.2.6a or later to 6.2.10.
VDC interface re-allocation can trigger this misprogramming.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
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