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Cisco Bug: CSCvu93688 - N3500: Outside NAT packets punted to CPU

Last Modified

Oct 06, 2020

Products (65)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 93600CD-GX Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 3132Q-V Switch
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Known Affected Releases


Description (partial)

Outside NAT traffic is punted to the CPU of the NAT router, rate-limited and/or consumed.
This will result in one-way packet loss for NAT flows - (outside -> inside direction)

Nexus 3x00 Series - 9.3(4)
NAT configuration - Outside Static NAT, Static Twice NAT,  or combination of both

This defect is only impacting NAT routers  with ECMP for out-to-in translations 

*Intermittently reproducible with Dynamic Twice NAT (configured with inside source list thus outside configured static)

ECMP NAT is in general not supported on n9k.
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