CHAPTER
24-1
Catalyst 3550 Multilayer Switch Software Configuration Guide
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24
Configuring SPAN and RSPAN
This chapter describes how to configure Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN)
on your Catalyst 3550 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 24-1
• Configuring SPAN, page 24-8
• Configuring RSPAN, page 24-16
• Displaying SPAN and RSPAN Status, page 24-23
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 or security device. SPAN mirrors received or transmitted (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 24-1, 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.
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