The Parallel Redundancy Protocol for Industrial IP Networks (original) (raw)

Redundancy enhancements for Industrial Ethernet ring protocols

Emerging Technologies and …, 2010

Ethernet ring redundancy is becoming a commodity in Industrial Ethernet environments. There are many ring redundancy protocols in existence, both standardized and proprietary. They all share the common disadvantage, that they can sustain only one fault in the network structure. A second fault results in parts of the network being unavailable. In this paper, we propose a mechanism which enhances well-known ring redundancy protocols with the capability of tolerating more than a single fault. This is achieved by installing secondary network paths and adding health monitoring to the ring clients. Protocol operation has been tested through simulation and prototypical implementation and is intended to be part of a future major software release of Hirschmann switches. A main advantage of this new protocol is the straightforward network design approach that enables to specifically protect vulnerable ring segments, based on availability calculations.

Selecting a Standard Redundancy Method for Highly Available Industrial Networks

2006 IEEE International Workshop on Factory Communication Systems, 2006

Availability of Industrial Ethernet networks can be increased by providing redundant links and nodes. Although many specifications of Industrial Ethernet have been submitted to the International Electrotechnical Committee (IEC), they do not disclose methods to implement network redundancy. A working group of the IEC will, as part of the fieldbus maintenance team, issue guidelines for implementing redundancy in switched networks. Since the redundancy is dictated by the plant and less by the network, several solutions are studied. While less time critical processes can be satisfied by a standby solution with alternate links, hard real time systems require a full duplication and parallel operation of redundancy. Both methods can be combined to increase further availability. Network safety or security is not considered here.

IEC 62439 PRP: Bumpless recovery for highly available, hard real-time industrial networks

2007 IEEE Conference on Emerging Technologies & Factory Automation (EFTA 2007), 2007

Availability of automation networks can be increased by providing redundant links and nodes. Although many specifications of industrial Ethernet have been submitted to the International Electrotechnical Committee (IEC), they do not disclose methods to implement network redundancy. The IEC SC65C worked out a standard for implementing redundancy in switched Ethernet networks applicable to a variety of industrial networks, with different

Automatic device configuration for Ethernet ring redundancy protocols

… & Factory Automation, …, 2009

In modern communication systems based on Ethernet technology, the use of physical ring structures and ring redundancy protocols has been common for some time in the past. A challenge remains the configuration of such a redundancy protocol on each device with the networks stretching out over large areas, like in offshore wind power stations, where each windmill houses at least one Ethernet switch. The distance between windmills can be several kilometers and configuration of the redundancy protocol on each device is an elaborate process. In this paper, a mechanism is proposed which automatizes the configuration of ring redundancy protocols and eliminates the need to configure each device separately. The actual protocol implementation is intended to be part of the next major software release of Hirschmann Industrial Ethernet Switches.

Performance Analysis of Media Redundancy Protocol (MRP)

IEEE Transactions on Industrial Informatics, 2000

The International Electrotechnical Commission (IEC) recently standardized several Industrial Ethernet solutions that introduce the fieldbus concepts within Ethernet based networks. In addition, the IEC 62439 standardized a set of redundancy management protocols, including the Media Redundancy Protocol (MRP). In this way, IEC standards provide a variety of Ethernet-based solutions for satisfying both temporal and redundancy management requirements of Industrial Area Networks (IANs).

Virtual Router Redundancy Protocol

1998

Virtual Router Redundancy Protocol Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.

An Evaluation of the Virtual Router Redundancy Protocol Extension with Load Balancing

2005

Virtual router redundancy protocol (VRRP) is designed to eliminate the single point of failure in the static default routing environment in LAN. The original VRRP protocol does not support load balancing for both incoming and outgoing traffic. This paper describes EVRRP, i.e. enhanced VRRP. EVRRP supports an efficient multiple-node cluster and symmetric load balancing among routers. Each router periodically exchanges information to determine the status of the master and backups. The master router distributes and redirects the traffic to one of the backup routers by ICMP redirect message. Backup routers accept the traffic from the master and one of the backup routers takes over the master traffic using a gratuitous ARP message when the master fails. The improved election protocol speeds up the original VRRP election protocol and shortens the failover time by adding a new state in the previous VRRP state diagram and a new protocol type. An extensive evaluation of the EVRRP protocol is described in the paper.

Advancements, trends and real-time considerations in industrial Ethernet protocols

2003

This paper discusses recent advancements in Industrial Ethernet protocols and more specifically it focuses on the real-time characteristics of the OLE for Process Control (OPC) systems compared to the pure real-time but less spread protocol RTPS (Real Time Publish Subscribe). Finally it proposes a merging of the two specifications in order to enhance the performance of OPC, aiming to support real-time communications.