Industrial Managed
Ethernet Switch – EH9711
User Manual
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network traffic can be analysed by a network analyser or a sniffer for network performance or security monitoring purposes.
Figure 2.111 shows the Mirror Port webpage. The descriptions of port mirroring options are summarized in Table 2.100.
Port mirroring or traffic mirroring enables users to monitor network traffic passing in, or out of, a set of ports. can then pass
this traffic to a destination port on the same router. Traffic mirroring copies traffic from one or more source ports and sends
the copied traffic to one or more destinations for analysis by a network analyser or other monitoring device. However, traffic
from one source port can be copied to only one destination port. Traffic mirroring does not affect the flow of traffic on the
source ports, and allows the mirrored traffic to be sent to a destination port. For example, you need to attach a traffic analyser
to the router if you want to capture Ethernet traffic that is sent by host A to host B. Traffic between host A and host B is also
seen on the destination port.
Figure 2.110 Traffic Mirroring Operation
When local traffic mirroring is enabled, the traffic analyser is attached directly to the port of the same router that is
configured to receive a copy of every packet that host A sends. This port is called a traffic mirroring port. The other sections
of this document describe how you can fine tune this feature.
The following types of traffic mirroring are supported:
●
Local traffic mirroring: This is the most basic form of traffic mirroring. The network analyzer orsniffer is directly
attached to the destination interface. In other words, all monitored ports are all located on the same router as the
destination port.
●
Layer 2 or Layer 3 traffic mirroring: Both Layer 2 and Layer 3 source ports can be mirrored.
Mirroring is a feature for switched port analyzer. The administrator can use the Mirroring to debug network problems. The
selected traffic can be mirrored or copied on a destination port where a network analyzer can be attached to analyze the network
traffic. Remote Mirroring is an extend function of Mirroring. It can extend the destination port in other switch so that the
administrator can analyze the network traffic on the other switches. If you want to get the tagged mirrored traffic, you have to
set VLAN egress tagging as "Tag All" on the reflector port. On the other hand, if you want to get untagged mirrored traffic,
you have to set VLAN egress tagging as "Untag ALL" on the reflector port.
