85
NOTE:
The reflector port is used to enable local mirroring to support multiple monitor ports.
Port mirroring classification and implementation
According to the locations of the mirroring source and the mirroring destination, port mirroring falls into
local port mirroring and remote port mirroring.
Local port mirroring
In local port mirroring, the mirroring source and the mirroring destination are on the same device. A
mirroring group that contains the mirroring source and the mirroring destination on the device is called
a “local mirroring group”.
Figure 32 Local port mirroring implementation
As shown in Figure 32, the source port Ethernet 1/0/1 and monitor port Ethernet 1/0/2 reside on the
same device. Packets of Ethernet 1/0/1 are copied to Ethernet 1/0/2, which then forwards the packets
to the data monitoring device for analysis.
Remote port mirroring
In remote port mirroring, the mirroring source and the mirroring destination reside on different devices
and in different mirroring groups. The mirroring group that contains the mirroring source or the mirroring
destination is called a “remote source/destination group”. The devices between the source devices and
destination device are intermediate devices.
Remote port mirroring falls into Layer 2 and Layer 3 remote port mirroring.
• Layer 2 remote port mirroring: In Layer 2 remote port mirroring, the mirroring source and the
mirroring destination are located on different devices on the same Layer 2 network.
• Layer 3 remote port mirroring: In Layer 3 remote port mirroring, the mirroring source and the
mirroring destination are separated by IP networks.
1. Layer 2 remote port mirroring
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