Specifications

CHAPTER

11-1

System Management Software Configuration Guide for Cisco IE 2000U and Connected Grid Switches

Configuring SPAN and RSPAN

This chapter describes how to configure Switched Port Analyzer (SPAN) and Remote SPAN (RSPAN)

on the Cisco Industrial Ethernet 2000U Series (IE 2000U) and Connected Grid Switches, hereafter

referred to as switch.

Note For complete syntax and usage information for the commands used in this chapter, see the documents

listed in the “Related Documents” section on page 11-26.

• Information About SPAN and RSPAN, page 11-1

• Prerequisites, page 11-8

• Guidelines and Limitations, page 11-8

• Default Settings, page 11-10

• Configuring SPAN and RSPAN, page 11-11

• Verifying Configuration, page 11-25

• Configuration Example, page 11-25

• Related Documents, page 11-26

• Feature History, page 11-27

Information About SPAN and RSPAN

You can analyze network traffic passing through ports or VLANs by using SPAN or RSPAN to send a

copy of the traffic to another port on the switch or on another switch that has been connected to a network

analyzer or other monitoring or security device. SPAN copies (or mirrors) traffic received or sent (or

both) on source ports or source VLANs to a destination port for analysis. SPAN does not affect the

switching of network traffic on the source ports or VLANs. You must dedicate the destination port for

SPAN use. Except for traffic that is required for the SPAN or RSPAN session, destination ports do not

receive or forward traffic.

Only traffic that enters or leaves source ports or traffic that enters or leaves source VLANs can be

monitored by using SPAN; traffic routed to a source VLAN cannot be monitored. For example, if

incoming traffic is being monitored, traffic that gets routed from another VLAN to the source VLAN

cannot be monitored; however, traffic that is received on the source VLAN and routed to another VLAN

can be monitored.