CHAPTER
25-1
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
78-11380-10
25
Configuring SPAN and RSPAN
This chapter describes how to configure Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN)
on your Catalyst 2950 or Catalyst 2955 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 and RSPAN, page 25-1
• Configuring SPAN, page 25-7
• Configuring RSPAN, page 25-12
• Displaying SPAN and RSPAN Status, page 25-17
Understanding SPAN and RSPAN
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 25-1, 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.
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