H3C Technologies H3C S6300 Series Switches - Manual (Page 180)

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• The source device is not directly connected to the data monitoring device.
• The source device copies mirrored packets to the destination device, which forwards them to the
data monitoring device.
• The mirroring source and the mirroring destination reside on different devices and are in different
mirroring groups.
A remote source group is a mirroring group that contains the mirroring sources. A remote destination
group is a mirroring group that contains the mirroring destination. Intermediate devices are the devices
between the source device and the destination device.
In Layer 2 remote port mirroring, the mirroring source and the mirroring destination are located on
different devices on a same Layer 2 network.
Layer 2 remote port mirroring operates as follows:
1. The source device copies packets received on the source port to the egress port.
2. The egress port forwards the packets to the intermediate devices.
3. The intermediate devices flood the packets in the remote probe VLAN to transmit the packets to the
destination device.
4. Upon receiving the mirrored packets, the destination device determines whether the ID of the
mirrored packets is the same as the remote probe VLAN ID. If the two VLAN IDs match, the
destination device forwards the mirrored packets to the data monitoring device through the
monitor port.
Figure 57 Layer 2 remote port mirroring implementation
To ensure Layer 2 forwarding of the mirrored packets, assign the ports that connect intermediate devices
to the source and destination devices to the remote probe VLAN.
To monitor both the received and sent packets of a port in a mirroring group, you must disable MAC
address learning for the remote probe VLAN on the source, intermediate, and destination devices. For
more information about MAC address learning, see Layer 2—LAN Switching Configuration Guide.
Destination
device
Source
device
Intermediate
device
XGE1/0/1 Remote
probe VLAN
Data monitoring
device
Host
Remote
probe VLAN
XGE1/0/2 XGE1/0/1 XGE1/0/2 XGE1/0/1
XGE1/0/2
XGE1/0/1
Mirroring process in the device
XGE1/0/2
Source port
Monitor port
Original packets
Common port Mirrored packets
Egress port