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BMD00220, October 2010 377
CHAPTER 29
Port Mirroring
The BLADEOS port mirroring feature allows you to mirror (copy) the packets of a target port, and
forward them to a monitoring port. Port mirroring functions for all layer 2 and layer 3 traffic on a
port. This feature can be used as a troubleshooting tool or to enhance the security of your network.
For example, an IDS server or other traffic sniffer device or analyzer can be connected to the
monitoring port in order to detect intruders attacking the network.
The G8124 supports a “many to one” mirroring model. As shown in Figure 44, selected traffic for
ports 1 and 2 is being monitored by port 3. In the example, both ingress traffic and egress traffic on
port 2 are copied and forwarded to the monitor. However, port 1 mirroring is configured so that only
ingress traffic is copied and forwarded to the monitor. A device attached to port 3 can analyze the
resulting mirrored traffic.
Figure 44 Mirroring Ports
Monitor Port
Specified traffic is copied
and forwarded to Monitor Port
Mirrored Ports
Ingress
Traffic
Both
Connected to
sniffer device
1 2
3
4