Industrial communication networks. High availability automation networks

2010 ◽  
Keyword(s):  
Communication Networks ◽  
High Availability

scholarly journals Resilient Capacity-Aware Routing

2021 ◽  
pp. 411-429
Author(s):  
Stefan Schmid ◽  
Nicolas Schnepf ◽  
Jiří Srba
Keyword(s):  
Communication Networks ◽  
Search Algorithm ◽  
Shortest Paths ◽  
Capacity Constraints ◽  
High Availability ◽  
Worst Case ◽  
Shortest Path Routing ◽  
Link Failures ◽  
Algorithmic Question ◽  
Improved Performance

AbstractTo ensure a high availability, communication networks provide resilient routing mechanisms that quickly change routes upon failures. However, a fundamental algorithmic question underlying such mechanisms is hardly understood: how to verify whether a given network reroutes flows along feasible paths, without violating capacity constraints, for up to k link failures? We chart the algorithmic complexity landscape of resilient routing under link failures, considering shortest path routing based on link weights as e.g. deployed in the ECMP protocol. We study two models: a pessimistic model where flows interfere in a worst-case manner along equal-cost shortest paths, and an optimistic model where flows are routed in a best-case manner, and we present a complete picture of the algorithmic complexities. We further propose a strategic search algorithm that checks only the critical failure scenarios while still providing correctness guarantees. Our experimental evaluation on a benchmark of Internet and datacenter topologies confirms an improved performance of our strategic search by several orders of magnitude.

scholarly journals Real-Time Performance and Security of IEC 61850 Process Bus Communications

2021 ◽  
Author(s):  
Stéphane Mocanu ◽  
Jean-Marc Thiriet
Keyword(s):  
Real Time ◽  
Communication Networks ◽  
Communication Protocol ◽  
High Availability ◽  
Hardware In The Loop ◽  
Power Network ◽  
Iec 61850 ◽  
Time Performance ◽  
Network Communications ◽  
Practical Feasibility

Modern power-network communications are based on the IEC 61850 series standards. In this paper, we investigate the real-time performance and the vulnerabilities and attack scenarios at the sensor level communication networks more precisely on Sampled Measured Value protocol. The approach jointly evaluates the communication protocol, network topology and impact on electrical protection functions. We test the practical feasibility of the attacks on an experimental workbench using real devices in a hardware-in-the-loop setup. The tests are conducted on the two high-availability automation networks currently used in IEC 61850 process bus communications: Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy (HSR)

scholarly journals Availability Evaluation and Maintenance Policy of Data Center Infrastructure

2020 ◽  
Author(s):  
Kádna Camboim ◽  
Carlos Melo ◽  
Jean Araujo ◽  
Fernanda Alencar
Keyword(s):  
Petri Nets ◽  
Communication Networks ◽  
Data Center ◽  
High Availability ◽  
Stochastic Petri Nets ◽  
Maintenance Policy ◽  
Service Levels ◽  
Tier 1 ◽  
Modeling Techniques ◽  
Reliability Block Diagrams

The convergence of communication networks and the demand for storage and processing capacities for large amounts of information, especially in recent years, has driven requests for everything-as-a-service and has been generating, on an increasing scale, demands for new data center constructions. However, to meet dependability attributes, the design of these infrastructures needs to consider, at least, the system’s availability to be achieved. In this paper, we evaluate the availability of a Tier 1 data center infrastructure, considering the use of blade systems. We use modeling techniques based on reliability block diagrams and stochastic Petri nets to simulate a maintenance policy encompassed at different service levels (SLA). The results show dependability metrics, focusing on the availability and maintenance of these networks. We highlight the most severe difficulties in achieving high availability when there is no component redundancy, and the intervals between maintenance are long.

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