Operation Manual – MirroringH3C S3100 Series Ethernet Switches Chapter 1 Mirroring Configuration1-21.1.2 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. Therefore, administrators can monitor the traffic on remote devicesconveniently.To implement remote port mirroring, a special VLAN, called remote-probe VLAN, isneeded. All mirrored packets are sent from the reflector port of the source switch to themonitor port (destination port) of the destination switch through the remote-probe VLAN,so as to implement the monitoring of packets received on and sent from the sourceswitch on the destination switch. Figure 1-2 illustrates the implementation of remoteport mirroring.Figure 1-2 Remote port mirroring applicationThe switches involved in the remote port mirroring implementation play the followingthree roles.z Source switch: The monitored port resident switch. It copies traffic to the reflectorport, which then transmits the traffic to an intermediate switch or destination switchthrough the remote-probe VLAN.z Intermediate switch: 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 directlyconnect to each other.z Destination switch: The remote mirroring destination port resident switch. Itforwards mirrored traffic flows it received from the remote-probe VLAN to themonitoring device through the destination port.Table 1-1 describes how the ports on various switches are involved in the mirroringoperation.
