Cisco Catalyst 3750-X Software Configuration Manual page 768

Configuring SPAN and RSPAN
Command
Step 4
monitor session session_number
destination {interface interface-id [, | -]
[encapsulation replicate]}
Step 5
end
show monitor [session session_number]
Step 6
show running-config
Step 7
copy running-config startup-config
To delete a SPAN session, use the no monitor session session_number global configuration command.
To remove a source or destination port or VLAN from the SPAN session, use the no monitor session
session_number source {interface interface-id | vlan vlan-id} global configuration command or the no
monitor session session_number destination interface interface-id global configuration command. For
destination interfaces, the encapsulation options are ignored with the no form of the command.
This example shows how to set up SPAN session 1 for monitoring source port traffic to a destination
port. First, any existing SPAN configuration for session 1 is deleted, and then bidirectional traffic is
mirrored from source Gigabit Ethernet port 1 to destination Gigabit Ethernet port 2, retaining the
encapsulation method.
Switch(config)# no monitor session 1
Switch(config)# monitor session 1 source interface gigabitethernet1/0/1
Switch(config)# monitor session 1 destination interface gigabitethernet1/0/2
encapsulation replicate
Switch(config)# end
This example shows how to remove port 1 as a SPAN source for SPAN session 1:
Switch(config)# no monitor session 1 source interface gigabitethernet1/0/1
Switch(config)# end
This example shows how to disable received traffic monitoring on port 1, which was configured for
bidirectional monitoring:
Switch(config)# no monitor session 1 source interface gigabitethernet1/0/1 rx
The monitoring of traffic received on port 1 is disabled, but traffic sent from this port continues to be
monitored.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
32-14
Purpose
Specify the SPAN session and the destination port (monitoring port).
For session_number, specify the session number entered in step 3.
For local SPAN, you must use the same session number for the
Note
source and destination interfaces.
For interface-id, specify the destination port. The destination interface
must be a physical port; it cannot be an EtherChannel, and it cannot be
a VLAN.
(Optional) [, | -] Specify a series or range of interfaces. Enter a space
before and after the comma; enter a space before and after the hyphen.
(Optional) Enter encapsulation replicate to specify that the destination
interface replicates the source interface encapsulation method. If not
selected, the default is to send packets in native form (untagged).
You can use monitor session session_number destination
Note
command multiple times to configure multiple destination ports.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save the configuration in the configuration file.
Chapter 32 Configuring SPAN and RSPAN
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