What is SPAN? SPAN (Switch Port Analyzer) is a network protocol that collects and forwards switch traffic to the SPAN port for analysis. SPAN is also referred to as Port Mirroring or Port Monitoring. It can be enabled on both physical ports and VLANs. Attributes of SPAN (Switch Port Analyzer) The attributes of the Switch Port Analyzer are: All ports related to a given session (whether source or destination) must belong to the same VLAN. If you don’t specify any interface in the port monitor command then all other ports belonging to the same VLAN as the interface will Read More …