Cisco Systems 3750E Monitor session sessionnumber, Destination interface interface-id, 30-13

Chapter 30 Configuring SPAN and RSPAN

Configuring SPAN and RSPAN

	Command	Purpose
Step 4
	monitor session session_number	Specify the SPAN session and the destination port (monitoring port).
	destination {interface interface-id[, -]	For session_number, specify the session number entered in step 3.
	[encapsulation replicate]}
		Note For local SPAN, you must use the same session number for
		the 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).
		Note You can use monitor session session_number destination
		command multiple times to configure multiple destination
		ports.
Step 5
	end	Return to privileged EXEC mode.
Step 6
	show monitor [session session_number]	Verify the configuration.
	show running-config
Step 7
	copy running-config startup-config	(Optional) Save the configuration in the configuration file.

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-idglobal 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-E and 3560-E Switch Software Configuration Guide
OL-9775-02		30-13