Operation Manual – MirroringH3C S5100-SI/EI Series Ethernet Switches Chapter 1 Mirroring Configuration1-21.1.1 Local Port MirroringIn local port mirroring, packets passing through one or more source ports of a deviceare copied to the destination port on the same device for packet analysis andmonitoring. In this case, the source ports and the destination port must be located onthe same device.1.1.2 Remote Port MirroringRemote port mirroring does not require the source and destination ports to be on thesame device. The source and destination ports can be located on multiple devicesacross the network. This allows an administrator to monitor traffic on remote devicesconveniently.To implement remote port mirroring, a special VLAN, called remote-probe VLAN, isused. All mirrored packets are sent from the reflector port of the source switch to themonitor port on the destination switch through the remote-probe VLAN. Figure 1-2illustrates the implementation of remote port mirroring.Figure 1-2 Remote port mirroring applicationThe switches involved in remote port mirroring function as follows:z Source switchThe source switch is the device where the monitored port is located. It copies trafficpassing through the monitored port to the reflector port. The reflector port thentransmits the traffic to an intermediate switch (if any) or destination switch through theremote-probe VLAN.z Intermediate switchIntermediate switches are switches between the source switch and destination switchon the network. An intermediate switch forwards mirrored traffic flows to the nextintermediate switch or the destination switch through the remote-probe VLAN. Nointermediate switch is present if the source and destination switches directly connect toeach other.z Destination switch
