896 CHAPTER 72: PORT MIRRORING CONFIGURATION
devices in a network. Currently, remote port mirroring can only be
implemented on Layer 2.
Implementing Port
Mirroring
Port mirroring is implemented through port mirroring groups, which fall into these
three categories: local port mirroring group, remote source port mirroring group,
and remote destination port mirroring group. Two port mirroring implementation
modes are introduced in the following section.
Local port mirroring
Local port mirroring is implemented by local port mirroring group.
In this mode, the source ports and the destination port are in the same local port
mirroring group. Packets passing through the source ports are duplicated and then
forwarded to the destination port.
Remote port mirroring
Remote port mirroring is achieved through the cooperation of remote source port
mirroring group and remote destination port mirroring group.
Figure 264 illustrates a remote port mirroring implementation.
Figure 264 A remote mirroring implementation
The devices in Figure 264 function as follows:
■ Source device
Source device contains source mirroring ports, and remote source port mirroring
groups are created on source devices. A source device duplicates the packets
passing the source ports on it and sends them to the outbound port. The packets
are then broadcast in the remote mirroring VLAN and are received by the
intermediate device or destination device.
■ Intermediate device
Intermediate devices are used to connect source devices and destination devices.
An intermediate device forwards the mirrored packets to the next intermediate
device or the destination device. If the source device is directly connected to the
destination device, no intermediate device is needed. In a remote mirroring VLAN,
the source devices and the destination device need to be able to communicate
with one another on Layer 2.
■ Destination device
Source
decive
Intermediate
device
Destination
device
Source
port
Destination
port
Outbound
port
Remote
mirroring
VLAN
Remote
mirroring
VLAN
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