Operation Manual – Mirroring
H3C S3100 Series Ethernet Switches Chapter 1 Mirroring Configuration
1-2
1.1.2 Remote Port Mirroring
Remote port mirroring does not require the source and destination ports to be on the
same device. The source and destination ports can be located on multiple devices
across the network. Therefore, administrators can monitor the traffic on remote devices
conveniently.
To implement remote port mirroring, a special VLAN, called remote-probe VLAN, is
needed. All mirrored packets are sent from the reflector port of the source switch to the
monitor 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 source
switch on the destination switch.
Figure 1-2 illustrates the implementation of remote
port mirroring.
Figure 1-2 Remote port mirroring application
The switches involved in the remote port mirroring implementation play the following
three roles.
z Source switch: The monitored port resident switch. It copies traffic to the reflector
port, which then transmits the traffic to an intermediate switch or destination switch
through the remote-probe VLAN.
z Intermediate switch: Switches between the source switch and destination switch
on the network. An intermediate switch forwards mirrored traffic flows to the next
intermediate switch or the destination switch through the remote-probe VLAN. No
intermediate switch is present if the source and destination switches directly
connect to each other.
z Destination switch: The remote mirroring destination port resident switch. It
forwards mirrored traffic flows it received from the remote-probe VLAN to the
monitoring device through the destination port.
Table 1-1 describes how the ports on various switches are involved in the mirroring
operation.
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