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Catalyst 2950 Desktop Switch Software Configuration Guide
78-11380-03
Chapter 10 Configuring the Switch Ports
Configuring SPAN
Creating a SPAN Session and Specifying Ports to Monitor
Beginning in privileged EXEC mode, follow these steps to create a SPAN session and specify the source
(monitored) and destination (monitoring) ports:
To remove the entire SPAN session, use the no monitor session session_number global configuration
command. To remove a source or destination port from the SPAN session, use the no monitor session
session_number source interface interface-id global configuration command or the no monitor session
session_number destination interface interface-id global configuration command.
This example shows how to set up a SPAN session, session 1, for monitoring source port traffic to a
destination port. First, any existing SPAN configuration for session 1 is cleared, and then bidirectional
traffic is mirrored from source port 1 to destination port 2.
Switch(config)# no monitor session 1
Switch(config)# monitor session 1 source interface gigabitethernet0/1
Switch(config)# monitor session 1 destination interface gigabitethernet0/2
Switch(config)# end
Switch# show monitor session 1
Session 1
---------
Source Ports:
RX Only: None
TX Only: None
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
monitor session session_number source
interface interface-id [, | -][both | rx | tx]
Specify the SPAN session and the source port (monitored port).
For session_number,specify1.
For interface-id, specify the source port to monitor. Valid interfaces
include physical interfaces and port-channel logical interfaces
(port-channel port-channel-number).
(Optional) [, | -] —Specify a series or range of interfaces. This option
is valid when monitoring only received traffic. Enter a space after the
comma; enter a space before and after the hyphen.
(Optional) Specify the direction of traffic to monitor. If you do not
specify a traffic direction, the source interface sends both transmitted
andreceivedtraffic.
• both—Monitor both received and transmitted traffic.
• rx—Monitor received traffic.
• tx—Monitor transmitted traffic.
Step 3
monitor session session_number
destination interface interface-id
Specify the SPAN session and the destination port (monitoring port).
For session_number,specify1.
For interface-id, specify the destination port. Validinterfaces include
physical interfaces.
Step 4
end Return to privileged EXEC mode.
Step 5
show monitor [session session_number] Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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