Cisco Systems 3750E manual Show monitor session sessionnumber, 30-22

Chapter 30 Configuring SPAN and RSPAN

Configuring SPAN and RSPAN

Specifying VLANs to Filter

Beginning in privileged EXEC mode, follow these steps to configure the RSPAN source session to limit RSPAN source traffic to specific VLANs:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	no monitor session {session_number all	Remove any existing SPAN configuration for the session.
	local remote}	For session_number, the range is 1 to 66.
		Specify all to remove all SPAN sessions, local to remove all local
		sessions, or remote to remove all remote SPAN sessions.
Step 3
	monitor session session_number source	Specify the characteristics of the source port (monitored port) and
	interface interface-id	SPAN session.
		For session_number, the range is 1 to 66.
		For interface-id, specify the source port to monitor. The interface
		specified must already be configured as a trunk port.
Step 4 monitor session session_number filter vlan		Limit the SPAN source traffic to specific VLANs.
	vlan-id [, -]	For session_number, enter the session number specified in step 3.
		For vlan-id, the range is 1 to 4094.
		(Optional) Use a comma (,) to specify a series of VLANs or use a
		hyphen (-) to specify a range of VLANs. Enter a space before and after
		the comma; enter a space before and after the hyphen.
Step 5
	monitor session session_number	Specify the RSPAN session and the destination remote VLAN
	destination remote vlan vlan-id	(RSPAN VLAN).
		For session_number, enter the session number specified in step 3.
		For vlan-id, specify the RSPAN VLAN to carry the monitored traffic
		to the destination port.
Step 6
	end	Return to privileged EXEC mode.
Step 7
	show monitor [session session_number]	Verify the configuration.
	show running-config
Step 8
	copy running-config startup-config	(Optional) Save the configuration in the configuration file.

To monitor all VLANs on the trunk port, use the no monitor session session_number filter vlan global configuration command.

This example shows how to remove any existing configuration on RSPAN session 2, configure RSPAN session 2 to monitor traffic received on trunk port 2, and send traffic for only VLANs 1 through 5 and 9 to destination RSPAN VLAN 902.

Switch(config)# no monitor session 2

Switch(config)# monitor session 2 source interface gigabitethernet1/0/2 rx

Switch(config)# monitor session 2 filter vlan 1 - 5 , 9

Switch(config)# monitor session 2 destination remote vlan 902

Switch(config)# end

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
30-22	OL-9775-02