Symptom
Traffic not seen on span destination if fex hif allowing vxlan vlan is the span source.
Conditions
span source is fex host interface (HIF)
FEX HIF is configured to allow a vlan which is extended over vxlan.
Workaround
Remove the vlan on Fex HIF from being extended over vxlan.
vlan
no vn-segment
Make span source to be a interface on N9k and not fex HIF
Further Problem Description