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Cisco Bug: CSCvt49488 - In Monsub fastpath packets are captured twice in vpp pcap

Last Modified

Oct 07, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.17.M0.private 21.18.0.74774 21.19.0 21.19.n1

Description (partial)

Symptom:
In Monitor Subscriber, Fastpath packets are captured incorrectly in the VPP PCAP file under certain conditions.  Downlink packets are being capture twice with GTPU header, and uplink packets are not being captured with GTPU headers.  This affects the first few packets of a TCP connection until packets are fully processed by the Fastpath without intervention by the SMGR slow path.

Conditions:
Monitor Subscriber is running to capture traffic on the UP.
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