Rockwell Automation 1734-AENTR EtherNet/IP Network Configuration User Manual - Manual (Page 146)

146 Rockwell Automation Publication ENET-UM001L-EN-P - March 2014
Chapter 10 Troubleshoot an EtherNet/IP Communication Module with Diagnostic Web Pages
146 Rockwell Automation Publication ENET-UM001L-EN-P - March 2014
Chapter 10 Troubleshoot an EtherNet/IP Communication Module with Diagnostic Web Pages
Port Mirroring
Select a managed switch that supports port mirroring. With port mirroring, you
can direct frames being transmitted on one port to another port for analysis by a
traffic analyzer. Besides monitoring your Ethernet media counters, port
mirroring enables you to immediately spot anomalies in traffic flow. A traffic
analyzer can monitor the traffic on a given port and troubleshoot a problem.
Without port mirroring, you cannot see frames on other ports. With hubs this is
not an issue because all frames are transmitted out all ports. The effective support
and maintenance of Ethernet networks often depends on reliable traffic analysis.
These are some benefits of port mirroring:
• Monitoring explicit messages between controllers
• Monitoring implicit or I/O traffic