Traffic Mirroring; Mirroring Configuration - 3Com 4500 Configuration Manual

Switch
Intermediate
switch
Destination switch
Do not configure a default VLAN, a management VLAN, or a dynamic VLAN as the remote-probe
VLAN.
Configure all ports connecting the devices in the remote-probe VLAN as trunk ports, and ensure
the Layer 2 connectivity from the source switch to the destination switch over the remote-probe
VLAN.
Do not configure a Layer 3 interface for the remote-probe VLAN, run other protocol packets, or
carry other service packets on the remote-prove VLAN and do not use the remote-prove VLAN as
the voice VLAN and protocol VLAN; otherwise, remote port mirroring may be affected.

Traffic Mirroring

Traffic mirroring uses ACL to monitor traffic that matches certain criteria on a specific port. Unlike port
mirroring where all inbound/outbound traffic passing through a port is monitored, traffic mirroring
provides a finer monitoring granularity. For detailed configuration about traffic mirroring, refer to
QoS-QoS Profile Operation.

Mirroring Configuration

Complete the following tasks to configure mirroring:
Configuring Local Port Mirroring
Configuring Remote Port Mirroring
On a Switch 4500, only one destination port for local port mirroring and only one reflector port can be
configured, and the two types of ports cannot both exist.
Ports involved
Trunk port
Trunk port
Destination port
Task
Sends mirrored packets to the destination switch.
Two trunk ports are necessary for the intermediate
switch to connect the devices at the source switch
side and the destination switch side.
Receives remote mirrored packets.
Receives packets forwarded from the trunk port and
transmits the packets to the data detection device.
Optional
Optional
1-3
Function
Remarks