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NOTE:
On port mirroring devices, all ports except source, destination, reflector, and egress ports are called
common ports.
Port mirroring classification and implementation
Port mirroring includes local port mirroring and remote port mirroring.
• Local port mirroring—The mirroring sources and the mirroring destination are on the same
device.
• Remote port mirroring—The mirroring sources and the mirroring destination are on different
devices.
Local port mirroring
In local port mirroring, the following conditions exist:
• The source device is directly connected to a data monitoring device.
• The source device acts as the destination device to forward mirrored packets to the data
monitoring device.
A local mirroring group is a mirroring group that contains the mirroring source and the mirroring
destination on the same device.
Figure 58 Local port mirroring implementation
As shown in Figure 58, the source port Ten-GigabitEthernet 1/0/1 and the monitor port
Ten-GigabitEthernet 1/0/2 reside on the same device. Packets received on Ten-GigabitEthernet
1/0/1 are copied to Ten-GigabitEthernet 1/0/2. Ten-GigabitEthernet 1/0/2 then forwards the packets
to the data monitoring device for analysis.
Remote port mirroring
In remote port mirroring, the following conditions exist:
• The source device is not directly connected to a data monitoring device.
• The source device copies mirrored packets to the destination device, which forwards them to
the data monitoring device.
• The mirroring sources and the mirroring destination reside on different devices and are in
different mirroring groups.
A remote source group or remote destination group is a mirroring group that contains the mirroring
sources or the mirroring destination, respectively. Intermediate devices are the devices between the
source devices and the destination device.
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