Technical information

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Redundancy
Technical information
Ethernet network
Infrastructure
Redundancy
To develop high availability applications, “redundancy” in the networking
infrastructure is the answer. Developers can help avoid losing network segments by
implementing a single ring or a coupled ring architecture.
Single ring
The rst level of redundancy is achieved by implementing a single ring. ConneXium
switches allow the set up of backbone ring congurations.
ConneXium switches support three redundancy protocols: HIPER-Ring, MRP, and
RSTP.
The ring is constructed using HIPER-Ring ports. If an error is detected in one section
of the line, a ring structure of up to 50 switches transforms back to a line-type
conguration within 0.5 seconds.
With a Modicon Quantum or a Modicon M580 Ethernet RIO architecture, the
recovery loop can be optimized to less than 50 ms thanks to the RSTP protocol
implemented in the different devices.
Dual ring
The second level of redundancy is achieved by implementing a dual ring. The control
intelligence built into ConneXium switches allows the redundant coupling of
HIPER-Rings and network segments.
As for a single ring, the recovery time can be optimized to less than 50 ms for 16
switches or 32 RIO drop adapters thanks to the RSTP protocol.
Mesh topology using the rapid “Spanning Tree” protocol
A third level of redundancy can be achieved by implementing a mesh topology.
In simple terms,“Spaning Tree” is a protocol that provides a single path for the
signal, when multiple paths exist. If the active path is broken, the “Spanning Tree”
protocol enables one of the alternative paths.
ConneXium switches offer this possibility.
Security
ConneXium rewalls help improve security for industrial networks while meeting the
needs for cybersecurity.
Firewall rules can be dened to control access levels at the host, protocol, and port
levels.
Further rules can be dened for other purposes, such as protecting access to
Modbus/TCP function codes and register levels, or EtherNet/IP CIP objects and
service codes.
ConneXium rewalls can also offer layer 3 routing, network address translation
(NAT), and virtual private networks (VPN) for advanced security zoning of critical
industrial networks.
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