Create “mirror” and interface to be used as the “SPAN” port or port used for packet capture. In this case port 8 will be used to receive packet captures

mirror 1 port 8

Mark ports to be monitored by SPAN port. Traffic from these ports will copied to the SPAN port for capture. In this example, interface or Ethernet port 1 will duplicate its traffic to the “mirror” or span port 1.

interface 1

monitor all both mirror 1

Connect a laptop to interface 8 on the switch and use wire shark or your PCAP client of choice to analyze traffic.