Fundamentals of Network Resiliency and Redundant Path Topology

Fundamentals of Network Resiliency and Redundant Path Topology for Ether. Net/IP Plant-wide Benefits of Ether. Net/IP Seminar PUBLIC INFORMATION Rev 5058 - Copyright © 2013 Rockwell Automation, Inc. All rights reserved.

Agenda Redundant Path Topology with Loop Avoidance – IEEE and IETF Resiliency Protocol Standards Device Level Ring (DLR) Protocol – Device-level Ring Topology Resilient Ethernet Protocol (REP) – Switch-level Ring Topology Additional Information PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 3

Networking Design Considerations Network Technology Convergence §Recommendations and guidance to help reduce Latency and Jitter, to help increase data Availability, Integrity and Confidentiality, and to help design and deploy a Scalable, Robust, Secure and Future. Ready Ether. Net/IP network infrastructure § Single Industrial Network Technology § Robust Physical Layer § Segmentation § Resiliency Protocols and Redundant Topologies § Time Synchronization § Prioritization - Quality of Service (Qo. S) § Multicast Management § Convergence-Ready Solutions PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 4

Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance Switch-level Topologies Redundant Star Cisco Catalyst 3750 Stack. Wise Switch Stack Flex Links Ring Cisco Catalyst 3750 Stack. Wise Switch Stack Resilient Ethernet Protocol (REP) Star/Bus Linear Cisco Catalyst 3750 Stack. Wise Switch Stack Cisco Catalyst 2955 HMI Controllers, Drives, and Distributed I/O Cell/Area Zone Controllers, Drives, and Distributed I/O Cell/Area Zone Device-level Topologies Switch-level and Device-level Topologies Controllers, Drives, and Distributed I/O Cell/Area Zone PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 6

Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance Redundant Star Cisco Catalyst 3750 Stack. Wise Switch Stack Flex Links Ring Star/Bus Linear Cisco Catalyst 3750 Stack. Wise Switch Stack Resilient Ethernet Protocol (REP) Cisco Catalyst 3750 Stack. Wise Switch Stack Cisco Catalyst 2955 HMI Controllers, Drives, and Distributed I/O Cell/Area Zone Controllers, Drives, and Distributed I/O Cell/Area Zone Redundant Star Ring Linear Best OK Worst Cabling Requirements Ease of Configuration Implementation Costs Bandwidth Redundancy and Convergence Disruption During Network Upgrade Readiness for Network Convergence Overall in Network TCO and Performance PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 7

Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance Rockwell Automation Stratix 5700/8000 Managed Industrial Layer 2 Access Switch Rockwell Automation Control. Logix Programmable Automation Controller § Redundant paths create a switching (bridging) loop § Without proper configuration, a loop will lead to a broadcast storm, flooding the network, which will consume available bandwidth, and take down a Layer 2 switched (bridged) network Layer 2 Ethernet frames do not have a time-to-live (TTL) § A Layer 2 frame can loop forever § PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 8

Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance Forwarding Blocking § A Layer 2 resiliency protocol maintains redundant paths while avoiding switching (bridging) loop PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 9

Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance Link Failure Blocking § Network convergence (healing, recovery, etc. ) must occur before the Industrial Automation and Control System (IACS) application is impacted PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 10

Resiliency Protocols and Redundant Path Topologies: Network Convergence § Network convergence (healing, recovery, etc. ) time – is a measure of how long it takes to detect a fault, find an alternate path, then start forwarding network traffic across that alternate path. MAC tables must be relearned § Multicast on uplinks must be relearned § § During the network convergence time, some portion of the traffic is dropped by the network because interconnectivity does not exist. § If the convergence time is longer than the Logix controller connection timeout, the IACS Ether. Net/IP devices on the affected portion of the network may stop operating and may affect the industrial automation application. PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 11

Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance Link Failure Forwarding § Network convergence must occur quickly enough to avoid a Logix Controller connection timeout: § Message (MSG) instruction - Explicit, CIP Class 3 Instruction timeout - 30 second default § KB #18945 - Control. Logix MSG instruction timeout values § § I/O and Producer/Consumer - Implicit, CIP Class 1 § § Safety I/O - Implicit, CIP Class 1 § PUBLIC INFORMATION Connection timeout - 4 x RPI, with a minimum of 100 ms Connection timeout - 4 x RPI by default Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 12

Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance Blocking § Don’t forget about potential loops on the switch itself PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 13

Resiliency Protocols and Redundant Path Topologies: Switching Options • Industrial versus COTS - Panel & DIN Rail Mounting vs. Table & Rack (e. g. 1 RU) • Managed versus Unmanaged Advantages Managed Switches § § § § Loop prevention Security services Diagnostic information Segmentation services (VLANs) Prioritization services (Qo. S) Network resiliency Multicast management services Unmanaged Switches § Inexpensive § Simple to set up ODVA Embedded Switch Technology § Cable simplification with reduced cost § Ring loop prevention & Network resiliency § Prioritization services (Qo. S) § Time Sync Services (IEEE 1588 PTP Transparent Clock) § Diagnostic information § Multicast management services PUBLIC INFORMATION Disadvantages § More expensive § Requires some level of support and configuration to start up § § No loop prevention No security services No diagnostic information No segmentation or prioritization services § Difficult to troubleshoot § No network resiliency support § Limited management capabilities § May require minimal configuration Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 14

Resiliency Protocols and Redundant Path Topologies: Topology Options Topology / Resiliency Protocol Redundant Star – Switchlevel Stratix 5700/8000/8300 Stratix 6000 X X Embedded 2 -Port Switch Stratix 2000 (MSTP, Ether. Channel, Flex Links) Ring – Switch-level (MSTP, REP) Ring – Device-level X (Device Level Ring Protocol - DLR) Star – Switch-level X (None) Linear X (None) X X Switch-level and Device-level Topologies X X X Controllers, Drives, and Distributed I/O Cell/Area Zone PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 15

Network Resiliency Protocols Layer 2 § Device-level Topology § Ring Embedded switch technology Ether. Net/IP IACS devices § Device Level Ring (DLR) Protocol – IEC & ODVA § § Switch-level Topology § Ring or Redundant Star § Spanning Tree Protocol (STP), Rapid STP (RSTP), Multiple instance STP (MSTP) – IEEE § Stratix 5700/8000/8300 – MSTP - default § Rapid Per VLAN Spanning Tree Plus (r. PVST+) - Cisco Technology § Ring Only § § Resilient Ethernet Protocol (REP) – Cisco Technology Redundant Star Only § Ether. Channel § Link Aggregation Control Protocol (LACP) - IEEE § PUBLIC INFORMATION Flex Links – Cisco Technology Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 16

Network Resiliency Protocols Layer 3 Catalyst 3750 x Switch Stack • Distribution switches typically provide first hop (default gateway) redundancy – Stack. Wise (3750 X), stack management – Hot Standby Router Protocol (HSRP) – Virtual Router Redundancy Protocol (VRRP) – Gateway Load Balancing Protocol (GLBP) PUBLIC INFORMATION Catalyst 3560 HSRP Active HSRP Standby Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 18

Network Resiliency Protocols Selection is Application Driven Resiliency Protocol Mixed Redunda Vend Ring nt or Star Network Convergen ce > 250 ms Network Convergenc e 60 - 100 ms Network Convergenc e 1 - 3 ms Layer 3 Layer 2 STP (802. 1 D) X X X RSTP (802. 1 w) X X X MSTP (802. 1 s) X X X r. PVST+ X X REP X Ether. Channel (LACP 802. 3 ad) X Flex Links DLR (IEC & ODVA) X X X X Stack. Wise X X HSRP X X GLBP X X X X VRRP (IETF RFC 3768) PUBLIC INFORMATION X X Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 19

Device-level Topology Customer Drivers § Linear Comfort level with traditional field bus topology § Eliminate cost of additional switches § Simplify network cabling § Applicable for certain applications that physically have a linear layout § Conveyor applications § Material handling application § § Ring § Making the linear topology into a ring provides single fault tolerance Network still functions if there is a (single) break § Better fault tolerance over normal star topology § § A resiliency protocol is needed in order to: Keep packets from circling the ring forever § Reconfigure to linear topology in event of a fault § Detect ring restoration and reconfigure to ring mode § PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 20

Embedded Switch Technology Device-level Topologies Port 1 Port 2 Linear Device-level Topology Ring Device-level Topology 2 -port Embedded Switch PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 21

Layer 2 - Data Link Switching – Embedded Switch Technology § Note that the Control. Logix and Compact. Logix L 4 x platforms can support multiple network interface cards (NICs) to segment network traffic. However, the Compact. Logix 5370 platform is not capable of this method of network segmentation. The two ports of the Compact. Logix 5370 PAC are part of an embedded switch, not a dual NIC. ENx. TR ENx. T’s Compact. Logix 5370 Control. Logix = = PUBLIC INFORMATION Control. Logix ≠ ≠ PHY Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 22

Embedded Switch Technology Device-level Topologies § 802. 3 operation Autonegotiation, with 10/100 Mbps, Full/Half duplex § Forced setting of speed/duplex § 802. 3 full duplex flow control § § Cut-through operation, with store & forward on contention § Qo. S Multiple queues § Prioritization via DSCP and 802. 1 Q/p § § Broadcast storm protection for host CPU § Filtering of incoming unicast and multicast to host CPU § Statistics and counters for the external ports § IEEE 1588, precision time protocol (PTP) § End to End (E 2 E) Transparent Clock (TC) PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 23

Device Level Ring (DLR) Protocol Device-level Ring Topology Compact. Logix Controller Forwarding Active Ring Supervisor Beacon Stratix 5700 IE Switch ETAP Announce Blocking Armor. Point I/O POINT I/O Beacon Announce Power. Flex Device-level Ring Topology with Device Level Ring Protocol § Supervisor blocks traffic on one port § Sends Beacon frames on both ports to detect break in the ring PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 26

Device Level Ring (DLR) Protocol Device-level Ring Topology Compact. Logix Controller Active Ring Supervisor Stratix 5700 IE Switch Link Failure Link Status ETAP Link Status Armor. Point I/O POINT I/O Power. Flex § All faults that are detectable at physical layer § Physical layer failure detected by protocol-aware node § Status message sent by ring node and received by ring supervisor PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 27

Device Level Ring (DLR) Protocol Device-level Ring Topology Compact. Logix Controller Stratix 5700 IE Switch Active Ring Supervisor Forwarding Link Failure ETAP Armor. Point I/O POINT I/O Forwarding POINT I/O Power. Flex § After failure detection, ring supervisor unblocks blocked port § Network configuration is now a linear topology § Fault location is readily available via diagnostics PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 28

Device Level Ring (DLR) Protocol Device-level Ring Topology Compact. Logix Controller Forwarding Active Ring Supervisor Beacon Stratix 5700 IE Switch ETAP Announce Blocking Armor. Point I/O POINT I/O Beacon Announce Power. Flex POINT I/O § Once ring is restored, supervisor hears beacon on both ports, and transitions to normal ring mode, blocking one port PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 29

Device Level Ring (DLR) Protocol Device-level Ring Topology § ODVA - open standard enabling suppliers to develop compatible products § Support for ring and linear topologies, fiber and copper implementations § Network traffic is managed to ensure timely delivery of critical data (Quality of Service, IEEE-1588 Precision Time Protocol, Multicast Management) § Ring is a single fault tolerant network § Designed for 1 -3 ms convergence for simple Ether. Net/IP device networks PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 30

Resilient Ethernet Protocol (REP) Switch-level Ring Topology REP segments apply to various Layer 2 Topo A A Segment 2 F B Forwarding B Segment 1 Blocking H Segment 1 D I E C C J K G E D F PUBLIC INFORMATION Segment 3 Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 31

Resilient Ethernet Protocol (REP) Switch-level Ring Topology Edge Port f 1 REP Segment B A f 2 interface f 2 rep segment 10 f 1 C f 2 f 1 D f 2 interface f 1 rep segment 10 interface f 2 rep segment 10 f 1 E f 2 f 1 Edge Port f 2 interface f 1 rep segment 10 § REP operates on chain of bridges called segments § A REP segment is a chain of ports § Terminated at the Edge Ports § A port is assigned to a unique segment § A segment can have up to two ports on a given bridge § Traffic flows towards the edge ports PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 32

Resilient Ethernet Protocol (REP) Switch-level Ring Topology f 2 Blocks Traffic Edge Port B A f 1 f 2 f 1 C f 2 f 1 D f 2 f 1 E f 2 f 1 f 2 Blocks Traffic f 2 f 2 Unblocks Link Failure B A Edge Port C f 2 f 1 D f 2 f 1 E f 2 f 1 f 2 § When all links are operational, a unique port blocks the traffic on the segment: the alternate port § If any failure occurs within the segment, the blocked port goes forwarding § Repaired link is blocked, unless preemption to preferred alternate port PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 33

Resilient Ethernet Protocol (REP) Switch-level Ring Topology Blocking A Forwarding C Forwarding B A C B Link Failure § Segments can be wrapped into a ring § Can be seen as a redundant link in that case § The REP segment is a simple building block that can be combined to form any kind of redundant network PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 34

Resilient Ethernet Protocol (REP) Switch-level Ring Topology § REP is a segment concept, REP segments apply to various Layer 2 Topologies § Support for flexible topologies - supports both closed and open rings in various topologies § Segment 1 C E D A Redundant networks can be built with REP segments § Only ring resiliency protocol applicable to both Industrial and IT applications § Ring recovery time is less than 80 ms D for both unicast and multicast traffic in fiber implementations E § F A B Segment 2 B C H Segment 1 I J K G Will not drop standard I/O connection § Cisco innovation, included with Stratix PUBLIC INFORMATION F Segment 3 Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 36

Ring Resiliency Protocols – Summary Switch-level & Device-level Topologies § Rapid Spanning Tree Protocol (RSTP) § <1 sec recovery time § Resilient Ethernet Protocol (REP) Ring Topology § REP, RSTP <80 ms recovery time § Device Level Ring (DLR) Beacon Protocol § 1 -3 ms recovery time PUBLIC INFORMATION DLR Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 37

Representative Configurations Resiliency Protocols and Redundant Path Topologies Production - VLANs IP Camera - VLAN Catalyst 3750 Stack. Wise Switch Stack Industrial Zone Level 3 Cell/Area Levels 0– 2 Zones HMI VLAN 103 Layer 2 Access Link Camera Layer 2 Interswitch Link/802. 1 Q Trunk Stratix 5700/8000/8300 REP CIP Class 1 & 3 Safety Controll er I/O VFD Drive VLAN 103 HMI PUBLIC INFORMATION I/ O Controll er I/O Safety I/O VLAN 43 Camera I/O VLAN 43 Controll er HMI VFD Drive Controll er I/O Servo Drive Instrumentati on 104 VLAN Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 38

Representative Configurations Resiliency Protocols and Redundant Path Topologies Production - VLANs IP Camera - VLAN Catalyst 4500 s HSR P HMI Cell/Area Levels 0– 2 Zones VLAN 103 Layer 2 Access Link Stratix 5700/8000/8300 REP CIP Class 1 & 3 Layer 2 Interswitch Link/802. 1 Q Trunk Safety Controll er I/O VFD Drive VLAN 103 Safety I/O HMI Camera VLAN 43 I/ O Controll er I/O PUBLIC INFORMATION Industrial Zone Level 3 Camera I/O VLAN 43 Controll er HMI VFD Drive Controll er I/O Servo Drive Instrumentati on 104 VLAN Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 39

Redundant Path Topology and Resiliency Protocol Summary Topology / Resiliency Protocol Redundant Star – Switchlevel Stratix 5700/8000/8300 Stratix 6000 X X Embedded 2 -Port Switch Stratix 2000 (MSTP, Ether. Channel, Flex Links) Ring – Switch-level (MSTP, REP) Ring – Device-level X (Device Level Ring Protocol - DLR) Star – Switch-level (None) X X X Linear X X § Use Fiber SFPs for Interswitch Links – Ring and Redundant Star Switch(None) level Topologies § MSTP for Redundant Star or Ring Switch-level Topologies, with CIP Explicit Messaging such as HMI, or 100 ms RPI CIP Implicit I/O Applications § Flex Links for Redundant Star Switch-level Topology with CIP Implicit I/O Applications § REP or DLR for Ring Topology with CIP Implicit I/O Applications § DLR for Ring Device-level Topology for applications such as: CIP Safety, PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 43

Design and Implementation Considerations § Choice of Redundant Path Topology and Resiliency Protocol is application dependent § § § Switch-level vs. Device-level topologies Ring vs. Redundant Star Topology Mixed switch vendor environment - Legacy Migration Geographic dispersion of Ether. Net/IP IACS devices Location within the hierarchal architecture - Layer 2 vs. Layer 3 Performance § Tolerance to: Network Convergence time, Packet loss, Latency & Jitter § Redundant Path topologies require a Resiliency Protocol § Switch-level Topologies § § Use Fiber SFPs for Interswitch Links Resilient Ethernet Protocol (REP) for Switch-level Ring Topology Resiliency Flex Links for Switch-level Redundant Star Topology Resiliency Device-level Topology § Device Level Ring (DLR) Protocol PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 44

Ether. Net/IP Advantage Summary § Single industrial network technology for: § Multi-discipline Network Convergence - Discrete, Continuous Process, Batch, Drive, Safety, Motion, Power, Time Synchronization, Supervisory Information, Asset Configuration/Diagnostics, and Energy Management § Established – 375+ vendors, over 7, 500, 000 nodes Risk reduction – broad availability of products, applications and vendor support § ODVA: Cisco Systems, Endress+Hauser, Rockwell Automation are principal members § Supported – all Ether. Net/IP products require conformance testing § § Standard – IEEE 802. 3 Ethernet and IETF TCP/IP Protocol Suite Enables convergence of IAT and IT – voice, video and data - common toolsets (assets for design, deployment and troubleshooting) and skills/training (human assets) § Standard IT technology - standard redundant path topologies with standard resiliency protocols § § Topology and media independence – flexibility and choice PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 45

Additional Material § Website: § http: //www. odva. org/ § Media Planning and Installation Manual § http: //www. odva. org/Portals/0/Library/Publications_Numbered/PUB 001 48 R 0_Ether. Net. IP_Media_Planning_and_Installation_Manual. pdf § Network Infrastructure for Ether. Net/IP: Introduction and Considerations § http: //www. odva. org/Portals/0/Library/Publications_Numbered/PUB 000 35 R 0_Infrastructure_Guide. pdf § Device Level Ring § http: //www. odva. org/Portals/0/Library/CIPConf_AGM 2009/2009_CIP_Networks _Conference_Technical_Track_Intro_to_DLR_PPT. pdf § The CIP Advantage § http: //www. odva. org/default. aspx? tabid=54 PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 46

Additional Material § Networks Website: http: //www. ab. com/networks/ § Ether. Net/IP Website: http: //ab. rockwellautomation. com/Networks-and. Communications/Ethernet-IP-Network § Media Website: http: //www. ab. com/networks/media/ethernet/ § Embedded Switch Technology Website: § http: //ab. rockwellautomation. com/Networks-and-Communications/Embedded. Switch-Technology § Publications: ENET-AP 005 -EN-P Embedded Switch Technology Manual ENET-UM 001 G-EN-P Ether. Net/IP Modules in Logix 5000 Control Systems …. provides connection and packet rate specs for modules § ENET-WP 0022 Top 10 Recommendations for plant-wide Ether. Net/IP Deployments § ENET-RM 002 A-EN-P Ethernet Design Considerations Reference Manual § ENET-AT 004 A-EN-E Segmentation Methods within the Cell/Area Zone § ENET-RM 003 A-EN-P Embedded Switch Technology Reference Architectures § ENET-WP 030 A-EN-E Choosing the correct Time Synchronization Protocol Copyright © 2013 Rockwell Automation, Inc. All rights reserved. PUBLIC INFORMATION § § 47

Additional Material § Education Series Webcasts § What every IT professional should know about Plant-Floor Networking § What every Plant-Floor Engineer should know about working with IT Industrial Ethernet: Introduction to Resiliency § Fundamentals of Secure Remote Access for Plant-Floor Applications and Data § Securing Architectures and Applications for Network Convergence § IT-Ready Ether. Net/IP Solutions § § Available Online § http: //www. rockwellautomation. com/rockwellautomation /products-technologies/network-technology/architectures. page? PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 48

Additional Material § Websites § Reference Architectures § Design Guides § Converged Plant-wide Ethernet (CPw. E) § Application Guides § Fiber Optic Infrastructure Application Guide § Education Series Webcasts § Whitepapers § § § Top 10 Recommendations for Plant-wide Ether. Net/IP Deployments Securing Manufacturing Computer and Controller Assets Production Software within Manufacturing Reference Architectures Achieving Secure Remote Access to plant-floor Applications and Data Design Considerations for Securing Industrial PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 49

§ A new ‘go-to’ resource for educational, technical and thought leadership information about industrial communications § Standard Internet Protocol (IP) for Industrial Applications § Coalition of like-minded companies www. industrial-ip. org PUBLIC INFORMATION Copyright © 2013 Rockwell Automation, Inc. All rights reserved. 50

Fundamentals of Network Resiliency and Redundant Path Topology for Ether. Net/IP Plant-wide Benefits of Ether. Net/IP Seminar PUBLIC INFORMATION Follow ROKAutomation on Facebook & Twitter. Connect with us on Linked. In. www. rockwellautomation. com PUBLIC INFORMATION Rev 5058 - Copyright © 2013 Rockwell Automation, Inc. All rights reserved.