12-7
When configuring the monitor port, use the following guidelines:
z
The port can belong to only the current mirroring group.
z
To ensure operation of your device, do not assign the monitor port to a mirroring VLAN.
z
Disable these functions on the port: STP, MSTP, and RSTP.
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
port mirroring groups
display mirroring-group
{
groupid
|
all
|
local
|
remote-destination
|
remote-source
}
Available in any
view
Port Mirroring Configuration Examples
Local Port Mirroring Configuration Example
Network requirements
The departments of a company connect to each other through Ethernet switches:
z
Research and Development (R&D) department is connected to Switch C through GigabitEthernet
1/0/1.
z
Marketing department is connected to Switch C through GigabitEthernet 1/0/2.
z
Data monitoring device is connected to Switch C through GigabitEthernet 1/0/3
As shown in
Figure 12-3
, the administrator wants to monitor the packets received on and sent from the
R&D department and the marketing department through the data monitoring device.
Use the local port mirroring function to meet the requirement. Perform the following configurations on
Switch C.
z
Configure GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 as mirroring source ports.
z
Configure GigabitEthernet 1/0/3 as the mirroring destination port.
