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How to configure SPAN and RSPAN in Cisco Catalyst switches
Switched Port Analyzer (SPAN) allows you to send a copy of traffic passing through ports to another port on the switch. SPAN is important to mirror received or transmitted (or both) traffic on one or more source ports to a destination port for analysis. While SPAN is mirroring ports in the same switch, RSPAN(Remote SPAN) is mirroring ports in one switch to a port in different switch.