3Com WX4400 3CRWX440095A, WXR100 3CRWXR10095A manual Port Mirroring, Requirements, Configuring Port

Port Mirroring 637

Port Mirroring	Port mirroring is a troubleshooting feature that copies (mirrors) traffic
	sent or received by a WX port (the source port) to another WX port (the
	observer). You can attach a protocol analyzer to the observer port to
	examine the source port’s traffic. Both traffic directions (send and receive)
	are mirrored.
	Port mirroring enables you to snoop traffic on wired ports. To snoop
	wireless traffic, see “Remotely Monitoring Traffic” on page 638.
Configuration	„ The switch can have one port mirroring pair (one source port and one
Requirements	observer port) at a time.
	„ The source port can be a network port, MAP access port, or wired
	authentication port.
	„ The observer port must be a network port, and cannot be a member
	of any VLAN or port group.
Configuring Port	To configure port mirroring, use the following command to specify the
Mirroring	source and observer ports:
	set port mirror source-portobserver observer-port

Displaying the Port

Mirroring

Configuration

Clearing the Port

Mirroring

Configuration

For example, to set port 2 to monitor port 1’s traffic, use the following command:

WX1200# set port 1 observer 2

Attach a protocol analyzer to the observer port; in this example, port 2.

To display the port mirroring configuration on a switch, use the following command:

WX1200# display port mirror

Port 1 is mirrored to port 2

To clear the port mirroring configuration from a switch, use the following command:

clear port mirror