3Com 9100 manual Port-Mirroring, Verifying the Load, Sharing, Configuration

60CHAPTER 3: ACCESSING THE SWITCH

	It is recommended that you configure the same duplex and speed
	settings for all ports in a load-sharing group.
	Do not disable a port that is part of a load-sharing group. Disabling the
	port prevents it from forwarding traffic, but still allows the link to
	initialize. As a result, a partner switch does receive a valid indication that
	the port is not in a forwarding state, and the partner switch will continue
	to forward packets.
Verifying the Load	The screen output resulting from the show ports configuration
Sharing	command indicates the ports are involved in load sharing and the master
Configuration	logical port identity.
Switch 9100	Port-mirroring configures the switch to copy all traffic associated with
Port-Mirroring	one or more ports to a monitor port on the switch. The monitor port can
	be connected to a network analyzer or RMON probe for packet analysis.
	The switch uses a traffic filter that copies a group of traffic to the monitor
	port.
	The traffic filter can be defined based on one of the following criteria:
	■ MAC source address/destination address — All data sent to or
	received from a particular source or destination MAC address is copied
	to the monitor port.

For MAC mirroring to work correctly, the MAC address must already be present in the forwarding database (FDB). For more information on the FDB, refer to Chapter 5.

■Physical port — All data that traverses the port, regardless of VLAN configuration, is copied to the monitor port.

■VLAN — All data to and from a particular VLAN, regardless of the physical port configuration, is copied to the monitor port.

■Virtual port — All data specific to a VLAN on a specific port is copied to the monitor port.

Up to eight mirroring filters and one monitor port can be configured on the switch. Once a port is specified as a monitor port, it cannot be used for any other function.

Frames that contain errors are not mirrored.