3Com Switch 7750 Configuration Guide Guide

59
MIRRORING CONFIGURATION
Overview Mirroring refers to the process of copying packets that meet the specified rules to
a destination port. Generally, a destination port is connected to a data detect
device, which you can use to analyze the mirrored packets for monitoring and
troubleshooting the network.
Figure 164 Mirroring
Local Port Mirroring Port mirroring refers to the process of copying the packets received or sent by the
specified port to the specified local port.
Remote Port Mirroring -
RSPAN
Remote switched port analyzer (RSPAN) refers to remote port mirroring. It
eliminates the limitation that the source port and the destination port must be
located on the same switch. This feature makes it possible for the source port and
the destination port to be located on different devices in the network, and
facilitates the network administrator to manage remote switches.
The application of RSPAN is illustrated in the following figure:
Figure 165 RSPAN application
Destination port
Data detect device
PC
Netw or k
Destination port
Data detect device
PC
Netw or k
Source
Switch
Intermediate Switch
Destination
Switch
Reflector port
Source Port
Relay port
Destination port
Remote-probe VLAN