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Cisco Bug: CSCvv36175 - N9K global cmd system dot1q-tunnel transit causes double dot1q tag on egress to server

Last Modified

Oct 04, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

9.3(4)

Description (partial)

Symptom:
With the global command "system dot1q-tunnel transit"
present in a vxlan enabled N9K switch the switch will not remove the incoming dot1q tag (VXLAN Encap) but add another, dot1q tag to the frame (VXLAN Decap) on the egress port (trunk) towards the end systems.

These frames then get subsequently dropped by the end systems which is causing loss of service on the end systems.

Conditions:
Switch needs to be in a vxlan fabric, global command 'system dotq-tunnel transit' has to be enabled.
No operational port for QinVNI on the switch
VPC VXLAN setup
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