See second bullet on page 19-307, Chapter 19, "Configuring ERSPAN: Guidelines and Limitations".
- "ERSPAN is not supported for management ports."
As to why it is not supported? Well, that is a question for the NX-OS developers...but as appears to be the case for so many questions posed here on the Cisco Community forum, I suspect it will continue to go unanswered... :( I think only money opens their ears...
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