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CHAPTER
21-1
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
21
Configuring SPAN and RSPAN
This chapter describes how to configure Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN)
on your 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 21-1
• Configuring SPAN, page 21-8
• Configuring RSPAN, page 21-14
• Displaying SPAN and RSPAN Status, page 21-20
Understanding SPAN and RSPAN
You can analyze network traffic passing through ports or VLANs 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. SPAN mirrors received or sent (or both) traffic on a source port and received
traffic on one or more source ports or source VLANs, to a destination port for analysis.
For example, in Figure 21-1, all traffic on port 5 (the source port) is mirrored to port 10 (the destination
port). A network analyzer on port 10 receives all network traffic from port 5 without being physically
attached to port 5.