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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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ERSPAN is used for capturing in layer 3
The Cisco ERSPAN mirrors traffic on one or more “source” ports and delivers the mirrored traffic to one or more “destination” ports on another switch. The traffic is encapsulated in Generic Routing Encapsulation (GRE) and is, therefore, routable across a Layer 3 network between the “source” switch and the “destination” switch. ERSPAN supports source ports, source VLANs, and destination ports on different switches, which provide Remote Monitoring of multiple switches across your network.
Last up in the SPAN lineup is ERSPAN. The concept is similar to RSPAN, except because we're encapsulating frames in IP, we need to specify IP addresses and uniquely identify each monitoring session.