3Com 5500-EI PWR Install Manual page 715

The administrator wants to monitor the packets received on and sent from the R&D
department and the marketing department through the data detection device.
Use the local port mirroring function to meet the requirement. Perform the following
configurations on Switch C.
Configure Ethernet 1/0/1 and Ethernet 1/0/2 as mirroring source ports.
Configure Ethernet 1/0/3 as the mirroring destination port.
Network diagram
Figure 1-3 Network diagram for local port mirroring
Configuration procedure
Configure Switch C:
# Create a local mirroring group.
<Sysname> system-view
[Sysname] mirroring-group 1 local
# Configure the source ports and destination port for the local mirroring group.
[Sysname] mirroring-group 1 mirroring-port Ethernet 1/0/1 Ethernet 1/0/2 both
[Sysname] mirroring-group 1 monitor-port Ethernet 1/0/3
# Display configuration information about local mirroring group 1.
[Sysname] display mirroring-group 1
mirroring-group 1:
type: local
status: active
mirroring port:
Ethernet1/0/1
Ethernet1/0/2
monitor port: Ethernet1/0/3
After the configurations, you can monitor all packets received on and sent from the R&D
department and the marketing department on the data detection device.
both
both
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