Cisco 2950G 24 - Catalyst Switch Software Configuration Manual page 448

Configuring SPAN
Command
Step 3 monitor session session_number source
interface interface-id [, | -] [both | rx | tx]
Step 4
monitor session session_number
destination interface interface-id
[encapsulation {dot1q | isl}]
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 10.
Switch(config)# no monitor session 1
Switch(config)# monitor session 1 source interface fastEthernet0/1
Switch(config)# monitor session 1 destination interface fastEthernet0/10
encapsulation dot1q
Switch(config)# end
Catalyst 2950 Desktop Switch Software Configuration Guide
21-10
Purpose
Specify the SPAN session and the source port (monitored port).
For session_number, specify 1 or 2.
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. 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 sent and
received traffic. Only received (rx) traffic can be monitored on
additional source ports.
both—Monitor both received and sent traffic.
•
rx—Monitor received traffic.
•
tx—Monitor sent traffic.
•
Specify the SPAN session and the destination port (monitoring port).
For session_number, specify 1 or 2.
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.
• isl—Use ISL encapsulation.
dot1q—Use 802.1Q encapsulation.
•
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 21 Configuring SPAN and RSPAN
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