Chapter 26 Configuring Span And Rspan; Understanding How Span And Rspan Work; Span Session - Cisco WS-C2948G-GE-TX Configuration Manual

Configuring SPAN and RSPAN
This chapter describes how to configure the Switched Port Analyzer (SPAN) and Remote SPAN
(RSPAN) on the Catalyst enterprise LAN switches.
Note For complete syntax and usage information for the commands that are used in this chapter, refer to the
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Command
Reference.
This chapter consists of these sections:
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•
•
•
Note To configure SPAN or RSPAN from a Network Management System (NMS), refer to the NMS
documentation (and see the

Understanding How SPAN and RSPAN Work

The following sections describe the concepts and terminology that are associated with SPAN and
RSPAN configuration.

SPAN Session

A SPAN session is an association of a destination port with a set of source ports, configured with
parameters that specify the monitored network traffic. You can configure multiple SPAN sessions in a
switched network. SPAN sessions do not interfere with the normal operation of the switches. You can
enable or disable SPAN sessions with command-line interface (CLI) or SNMP commands. When
enabled, a SPAN session might become active or inactive based on various events or actions that would
be indicated by a syslog message. The "Status" field in the show span and show rspan commands
displays the operational status of a SPAN or RSPAN session.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Understanding How SPAN and RSPAN Work, page 26-1
SPAN and RSPAN Session Limits, page 26-4
Configuring SPAN, page 26-4
Configuring RSPAN, page 26-8
"Using CiscoWorks2000" section on page
C H A P T E R
24-17).
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