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CHAPTER
20-1
Catalyst 2940 Switch Software Configuration Guide
78-15507-02
20
Configuring SPAN
This chapter describes how to configure Switched Port Analyzer (SPAN) on your Catalyst 2940 switch.
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
This chapter consists of these sections:
• Understanding SPAN, page 20-1
• Configuring SPAN, page 20-6
• Displaying SPAN Status, page 20-10
Understanding SPAN
You can analyze network traffic passing through ports by using SPAN to send a copy of the traffic to
another port on the switch that has been connected to a SwitchProbe device or other Remote Monitoring
(RMON) probe or security device. SPAN mirrors received or sent (or both) traffic on one or more source
ports to a destination port for analysis.
For example, in Figure 20-1, all traffic on port 4 (the source port) is mirrored to port 8 (the destination
port). A network analyzer on port 8 receives all network traffic from port 4 without being physically
attached to port 4.