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Cisco Bug: CSCvs28556 - TCP-NAT translations in stuck state after longevity test.

Last Modified

May 10, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

9.3(2.9)

Description (partial)

Symptom:
Under scale scenario with continuous creation & deletion of TCP NAT translations over a long period where the number of NAT translations keep exceeding the max translations possible in hardware with atomic update configured ("hardware access-list update atomic" -  with make before break programming of NAT translation hardware TCAM entries) some NAT translations may be stuck in stale state in software DB and in hardware ACL TCAM.

Conditions:
Scale scenario with continuous creation & deletion of TCP NAT translations over a long period where the number of NAT translations to be setup keep exceeding the max translations possible with atomic update ("hardware access-list update atomic") configured  -> which is 50% of the (NAT TCAM region size - TCP NAT region size).
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