Creating A Span Session And Enabling Ingress Traffic - Cisco Catalyst 2950 Software Configuration Manual

Chapter 24 Configuring SPAN and RSPAN
Command
Step 4 monitor session session_number
destination interface interface-id
[encapsulation {dot1q}]
Step 5
end
Step 6 show monitor [session session_number]
Step 7 copy running-config startup-config
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 8.
Switch(config)# no monitor session 1
Switch(config)# monitor session 1 source interface fastethernet0/1
Switch(config)# monitor session 1 destination interface fastethernet0/8
encapsulation dot1q
Switch(config)# end

Creating a SPAN Session and Enabling Ingress Traffic

Beginning in privileged EXEC mode, follow these steps to create a SPAN session, to specify the source
and destination ports, and to enable ingress traffic on the destination port for a network security device
(such as a Cisco IDS Sensor Appliance):
Command
Step 1 configure terminal
Step 2 no monitor session {session_number | all |
local | remote}
78-11380-12
Purpose
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.
(Optional) Specify the encapsulation header for outgoing packets. If
not specified, packets are sent in native form.
dot1q—Use IEEE 802.1Q encapsulation.
•
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Clear any existing SPAN configuration for the session.
For session_number, specify 1.
Specify all to remove all SPAN sessions, local to remove all local
sessions, or remote to remove all remote SPAN sessions.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Configuring SPAN
24-9