3Com 5500-EI PWR Install Manual page 709

Table 1-1 describes how the ports on various switches are involved in the mirroring
operation.
Table 1-1 Ports involved in the mirroring operation
Switch
Source 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.
Ports involved
Source port
Reflector port
Trunk port
Trunk port
Trunk port
Destination port
Port monitored. It copies packets to the
reflector port through local port mirroring.
There can be more than one source port.
Receives packets from the source port and
broadcasts the packets in the remote-probe
VLAN.
Sends mirrored packets to the intermediate
switch or the destination switch.
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.
1-3
Function