Cisco Catalyst 2950 Software Manual page 263

Chapter 10 Configuring the Switch Ports
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:
Command
Step 1
configure terminal
Step 2
monitor session session_number source
interface interface-id [, | -] [both | rx | tx]
Step 3 monitor session session_number
destination interface interface-id
Step 4
end
Step 5
show monitor [session session_number]
Step 6 copy running-config startup-config
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:
78-11380-03
RX Only: None
TX Only: None
Purpose
Enter global configuration mode.
Specify the SPAN session and the source port (monitored port).
For session_number, specify 1.
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
and received traffic.
both—Monitor both received and transmitted traffic.
•
rx—Monitor received traffic.
•
tx—Monitor transmitted traffic.
•
Specify the SPAN session and the destination port (monitoring port).
For session_number, specify 1.
For interface-id, specify the destination port. Valid interfaces include
physical interfaces.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 2950 Desktop Switch Software Configuration Guide
Configuring SPAN
10-23