Most network admins are familiar with span and rspan which makes it possible to troubleshoot traffic flowing through your switches.
The Nexus switches however, do not support rspan. This makes troubleshooting a switch a tad more difficult. Luckily they do support ERSPAN. ERSPAN stands for Encapsulated Remote Span. It makes span possible using a GRE tunnel to any routable address. This is even better that rspan!
What makes it even more usable is that the newest versions of wireshark natively support erspan. You can send all the span data to your own pc and analyze it from there.
To configure erspan you can use the following guide: