Cisco Systems 3750E Specifying VLANs to Filter, Monitor session sessionnumber filter vlan, 30-15

Chapter 30 Configuring SPAN and RSPAN

Configuring SPAN and RSPAN

	Command	Purpose
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 and ingress options are ignored with the no form of the command.

This example shows how to remove any existing configuration on SPAN session 2, configure SPAN session 2 to monitor received traffic on Gigabit Ethernet source port 1, and send it to destination Gigabit Ethernet port 2 with the same egress encapsulation type as the source port, and to enable ingress forwarding with IEEE 802.1Q encapsulation and VLAN 6 as the default ingress VLAN.

Switch(config)# no monitor session 2

Switch(config)# monitor session 2 source gigabitethernet1/0/1 rx

Switch(config)# monitor session 2 destination interface gigabitethernet1/0/2 encapsulation replicate ingress dot1q vlan 6

Switch(config)# end

Specifying VLANs to Filter

Beginning in privileged EXEC mode, follow these steps to limit SPAN 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.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		30-15