1-3
z A local mirroring group takes effect only after you configure a monitor port and mirroring ports for it.
z To ensure the smooth operation of your device, do not enable STP, MSTP, or RSTP on the
monitor port.
z You are recommended to use a monitor port only for port mirroring. This is to ensure that the data
monitoring device receives and analyzes only the mirrored traffic rather than a mix of mirrored
traffic and normally forwarded traffic.
Displaying and Maintaining Port Mirroring
To do… Use the command… Remarks
Display the configuration of
mirroring group
display mirroring-group { group-id | local }
Available in any view
Port Mirroring Configuration Examples
Local Port Mirroring Configuration Example
Network requirements
On a network shown in Figure 1-2,
z Department 1 is connected to port GigabitEthernet 1/0/1 of Device C through Device A.
z Department 2 is connected to port GigabitEthernet 1/0/2 of Device C through Device B.
z The Server is connected to port GigabitEthernet 1/0/3 of Device C.
To monitor the bidirectional traffic of Department 1 and Department 2 on the Server, configure a local
mirroring group on Device C following this scheme:
z Configure port GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 as mirroring ports.
z Configure port GigabitEthernet 1/0/3 as the monitor port.
Figure 1-2 Network diagram for local port mirroring configuration
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