Allied Telesis AT-8550 - Manual (Page 64)

Port Mirroring
3-10
Port Mirroring
Port-mirroring configures the switch to copy all traffic associated
with 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.
Note
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.
Note
Frames that contain errors are not mirrored.