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Cisco Bug: CSCuw41346 - ESP packets discarded during re-key with static NAT on ASR1k

Last Modified

Feb 25, 2018

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.3(3)S4

Description (partial)

Symptom:
Traffic loss through IPSEC tunnels (at the time of Phase-2 rekey). After the re-key, the NatIN2out drop counter is seen to increment on the router performing the ESP NAT:

BGL.I.06-ASR1000-1#sh plat hardware qfp active statistics drop 
-------------------------------------------------------------------------
Global Drop Stats                         Packets                  Octets  
-------------------------------------------------------------------------
NatIn2out                                       5                     670  <<<<<<<<<  NatIN2out drops

Conditions:
NAT is implemented in such a way that the Tunnel end points are not aware of it, therefore, NAT-T does not come into picture and the VPN endpoints do not encapsulate ESP into UDP\4500.
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