Specifications

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Industrial Ethernet Solutions
Industrial Ethernet Switches >
Introduction to Managed Ethernet Switches
3
A VLAN is a group of devices that can be located anywhere on a
network, but which communicate as if they are on the same physical
segment. VLANs can be used to segment your network without being
restricted by physical connections—a limitation imposed by traditional
network design. Besides, since all automation systems incorporate
sensitive devices that must be protected from unauthorized access,
it is very important to have some type of authentication system set
up that only allows authorized users to access the system. If devices
belong to different VLANs, they cannot communicate with each other,
providing extra security and protection from unwanted invasion or
traffic. The IEEE 802.1Q standard and GVRP protocol can exchange the
same interoperable parameters to keep consistent VLAN settings over
the entire network.
VLAN Eases Network Planning
Quality of Service (QoS) provides a traffic prioritization capability to
ensure that important data is delievered consistently and predictably.
Moxa’s managed Ethernet switches can inspect IEEE 802.1p/1Q layer
2 CoS tags, and even layer 3 TOS information, to provide a consistent
classification of the entire network. The QoS capability of the managed
Ethernet switches improve your industrial network’s performance and
determinism for mission-critical applications.
QoS Increases Determinism
Low Priority
Collected Data
Top Priority
High Priority
Control Message
Management
Message
VLAN1
VLAN2
VLAN3
Department 1 Department 2 Department 3
Unlimited bandwidth should not be given to any single device on
a network, particularly in light of what could happen if the device
malfunctions. The most well-known problem is the broadcast
storms caused by setting up the wrong topology, or by devices
that malfunction. Moxa’s managed Ethernet switches not only
prevent broadcast storms, but in addition, the ingress/egress rate
of unicast/multicast/broadcast packets can also be configured to
give administrators full control of limited bandwidth to prevent
unpredictable faults.
Bandwidth Management Prevents Unpredictable Network Status
Traffic filtered or dropped inside
Moxa’s managed Ethernet switches
Normal Traffic
Overloaded
Traffic
Failed
Network Device
Low
Priority
Top
Priority
High
Priority
Moxa’s managed Ethernet switches (not including the EDS-400A) support
IEEE 802.1D-1998 GMRP (GARP Multicast Registration Protocol) and IGMP
snooping, which provide the ability to prune multicast traffic so that it travels
only to those end destinations that require this kind of traffic. The overall
effect is to reduce the amount of traffic on the Ethernet LAN.
IGMP Snooping and GMRP for Filtering Multicast Traffi c
RMON (Remote Network Monitoring) is an Internet Engineering Task
Force (IETF) standard monitoring specification that allows various network
agents and console systems to exchange network monitoring data. RMON
provides you with comprehensive network fault diagnosis, planning, and
performance-tuning information, and helps you manage your network in
a more proactive manner. If configured correctly, RMON probes deliver
information before problems occur. This means that you can take action
before the problems affect users.
RMON for Effi cient Network Monitoring and Proactive Capability
Group 1
Multicast Stream
Group 2
Multicast Stream
IGMP Group 2 IGMP Group 2
IGMP Group 1
IGMP Group 1