Local Port Mirroring; Remote Port Mirroring - H3C S5100-SI Series Operation Manual

Operation Manual – Mirroring
H3C S5100-SI/EI Series Ethernet Switches

1.1.1 Local Port Mirroring

In local port mirroring, packets passing through one or more source ports of a device
are copied to the destination port on the same device for packet analysis and
monitoring. In this case, the source ports and the destination port must be located on
the same device.

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. This allows an administrator to monitor traffic on remote devices
conveniently.
To implement remote port mirroring, a special VLAN, called remote-probe VLAN, is
used. All mirrored packets are sent from the reflector port of the source switch to the
monitor port on the destination switch through the remote-probe VLAN.
illustrates the implementation of remote port mirroring.
Figure 1-2 Remote port mirroring application
The switches involved in remote port mirroring function as follows:
Source switch
The source switch is the device where the monitored port is located. It copies traffic
passing through the monitored port to the reflector port. The reflector port then
transmits the traffic to an intermediate switch (if any) or destination switch through the
remote-probe VLAN.
Intermediate switch
Intermediate switches are 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.
Destination switch
Chapter 1 Mirroring Configuration
1-2
Figure 1-2