How to monitor network traffic through Cisco Nexus switches

Configure Cisco Nexus Switch

Open a session on the switch
Enter configure mode
configure terminal
Enter the configuration mode for the specified Ethernet interface you want to mirror to
interface eth <port>
Set the interface to monitor
switchport monitor
Exit back to configuration mode
exit
Configure the monitor
monitor session <session number here>
Configure the destination port
destination interface ethernet <port>
Configure the source port(s) or VLAN(s)
source interface ethernet|vlan <port|vlan-id> both
Exit back to configuration mode
exit

Ensure you save your configuration once you have verified it is configured correctly