3Com 4210G Series Configuration Manual page 481

[Sysname] traffic behavior 1
[Sysname-behavior-1] mirror-to interface GigabitEthernet 1/0/2
[Sysname-behavior-1] quit
# Create QoS policy 1 and associate traffic behavior 1 with class 1 in the QoS policy.
[Sysname] qos policy 1
[Sysname-policy-1] classifier 1 behavior 1
[Sysname-policy-1] quit
# Apply the QoS policy to the incoming traffic of GigabitEthernet 1/0/1.
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] qos apply policy 1 inbound
After the configurations, you can monitor all packets sent from Host A on the data monitoring device.
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