Plant-wide Benefits of EtherNet/IP Seminar

Plant-wide Benefits of EtherNet/IP Seminar
Fundamentals of Network Resiliency and Redundant Path Topology for EtherNet/IP Plant-wide Benefits of EtherNet/IP Seminar

What you will learn Design recommendations developed by Rockwell Automation and Cisco Systems to help customers improve the availability of their EtherNet/IP network Importance of loop avoidance with redundant path topologies Education on resiliency technology Industry and technology standards

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

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 EtherNet/IP network infrastructure Single Industrial Network Technology Robust Physical Layer Segmentation Resiliency Protocols and Redundant Topologies Time Synchronization Prioritization - Quality of Service (QoS) Multicast Management Convergence-Ready Solutions Security - Defense-in-Depth Scalable Secure Remote Access Designing a resilient network infrastructure with low latency and jitter increases the availability and integrity of control and information data. Latency, or delay, represents the time elapsed from when one device transmits data until another device receives it. Jitter represents the variation of delay. Converging multidiscipline control and information traffic into a common industrial network requires reducing latency and jitter. To reduce network latency and jitter, CPwE recommends segmenting and prioritizing network traffic. Segmentation reduces the impact of broadcast and multicast traffic.

Layer 3 Distribution Switch
Logical Framework Converged Plant-wide Ethernet Reference Architectures Layer 3 Distribution Switch Catalyst 3750 StackWise Switch Stack Cell/Area Zones Levels 0–2 Layer 2 Access Switch Level 2 HMI HMI Rockwell Automation Stratix 5700/8000 Layer 2 Access Switch Safety I/O Safety Controller Phone Controller Camera MCC I/O Soft Starter Instrumentation Level 0 Drive Reducing network latency and jitter starts with the Cell/Area Zone. When designing the Cell/Area Zone, users should create smaller Layer 2 Cell/Area Zone network segments organized by function or geographic area. Restrict data flow out of the Cell/Area Zone unless Plant-wide operations explicitly require it. Each Cell/Area Zone should be implemented with a dedicated VLAN and IP subnet. VLANs segment network traffic and help restrict broadcast and multicast traffic as well as simplify security policy management. As a best practice, use the layer 3 distribution switches to route information between Cell/Area Zone VLANs and Plant-wide operations in the Industrial Zone. Avoiding large layer 2 networks helps simplify network management. Recommendations and best practices for the Cell/Area Zone include: Shape and manage traffic by implementing smaller Cell/Area Zones with a separate VLAN and IP subnet per Cell/Area Zone. Use managed layer 2 access switches to segment traffic with VLANs, prioritize traffic with QoS, implement security policies with port security and access control lists (ACL), and provide diagnostics. Implement a resilient topology. Lower network latency and jitter by using Gigabit Ethernet ports for trunks and uplinks, VLANs to reduce broadcast traffic, Internet Group Management Protocol (IGMP) to reduce multicast traffic, QoS to prioritize traffic and redundant star topology for natural segmentation. Servo Drive Media & Connectors Level 1 Controller Cell/Area Zone #1 Redundant Star Topology Flex Links Resiliency Cell/Area Zone #2 Ring Topology Resilient Ethernet Protocol (REP) Cell/Area Zone #3 Bus/Star Topology The Cell/Area zone is a Layer 2 network for a functional area (plant-wide or site-wide) Key network considerations include: Structure and hierarchy using smaller Layer 2 building blocks Logical segmentation for traffic management and policy enforcement (e.g. QoS, Security) to accommodate time-sensitive applications

Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance
Switch-level Topologies Redundant Star Flex Links HMI Cisco Catalyst 2955 Cell/Area Zone Cisco Catalyst 3750 StackWise Switch Stack Controllers, Drives, and Distributed I/O Controller Ring Resilient Ethernet Protocol (REP) HMI Cell/Area Zone Controllers Controllers, Drives, and Distributed I/O Cisco Catalyst 3750 StackWise Switch Stack Star/Bus Linear Cell/Area Zone Controllers, Drives, and Distributed I/O HMI Controllers Cisco Catalyst 3750 StackWise Switch Stack Device-level Topologies Switch-level and Controllers, Drives, and Distributed I/O Cell/Area Zone

Star Flex Links Ring Resilient Ethernet Protocol (REP) Star/Bus Linear Cisco Catalyst 3750 StackWise Switch Stack Cisco Catalyst 3750 StackWise Switch Stack Cisco Catalyst 3750 StackWise Switch Stack Cisco Catalyst 2955 HMI HMI Controller Controllers HMI Controllers HMI Controllers, Drives, and Distributed I/O Cell/Area Zone Controllers, Drives, and Distributed I/O Controllers, Drives, and Distributed I/O Cell/Area Zone Cell/Area Zone Cell/Area Zone Redundant Star Ring Linear 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 Best OK Worst Network topology choice impacts the availability and integrity of Industrial Network control and information data. This slide depicts the bus/star (linear), ring and redundant star topologies described within the Converged Plantwide Ethernet Architectures . Topology choice is driven by application requirements. As I noted earlier, you need to understand requirements for: Performance & throughput Latency and jitter tolerance Tolerance to downtime and mean-time-to-repair (MTTR) Future upgrade and expansion requirements. From right to left, this slide depicts increases to network resiliency, modularity, flexibility and implementation complexity and increased costs Redundant Star topology is recommended by Rockwell Automation and Cisco due to it’s modular, tiered and building block approach. Redundant Star is prominent within Enterprise Networks but not today within Industrial networks Ring is prominent within Industrial networks due to the geographic dispersion of industrial automation and control system IIACS) applications, but Redundant Star is starting to emerge within IACS With redundant paths with Ring and Redundant Star topologies, how do we avoid loops?

Programmable Automation Controller
Resiliency Protocols and Redundant Topologies: Layer 2 – Loop Avoidance Rockwell Automation Stratix 5700/8000 Managed Industrial Layer 2 Access Switch Rockwell Automation ControlLogix 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

Forwarding Blocking A Layer 2 resiliency protocol maintains redundant paths while avoiding switching (bridging) loop

Link Failure Blocking Network convergence (healing, recovery, etc.) must occur before the Industrial Automation and Control System (IACS) application is impacted

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 EtherNet/IP devices on the affected portion of the network may stop operating and may affect the industrial automation application.

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 # ControlLogix MSG instruction timeout values I/O and Producer/Consumer - Implicit, CIP Class 1 Connection timeout - 4 x RPI, with a minimum of 100 ms Safety I/O - Implicit, CIP Class 1 Connection timeout - 4 x RPI by default

Blocking Don’t forget about potential loops on the switch itself

Resiliency Protocols and Redundant Path Topologies: Switching Options
Industrial versus COTS - Panel & DIN Rail Mounting vs. Table & Rack (e.g. 1RU) Managed versus Unmanaged Advantages Disadvantages Managed Switches Unmanaged Switches ODVA Embedded Switch Technology Loop prevention Security services Diagnostic information Segmentation services (VLANs) Prioritization services (QoS) Network resiliency Multicast management services 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 Inexpensive Simple to set up To reduce network latency and jitter, CPwE Architectures recommends segmenting and prioritizing network traffic. Segmentation reduces the impact of broadcast and multicast traffic. Segmentation also establishes domains of trusts, with simplifies management of security policies. Managed industrial Ethernet switches provide: Loop prevention Segmentation and prioritization to reduce latency and jitter for a converged control and information network Security features to protect manufacturing assets from internal and external security threats. Diagnostics to reduce MTTR and increase OEE. Resiliency options to maintain availability and integrity of control and information data. Cable simplification with reduced cost Ring loop prevention & Network resiliency Prioritization services (QoS) Time Sync Services (IEEE 1588 PTP Transparent Clock) Diagnostic information Multicast management services Limited management capabilities May require minimal configuration

Resiliency Protocols and Redundant Path Topologies: Topology Options
Topology / Resiliency Protocol Stratix 5700/8000/8300 Stratix 6000 Embedded 2-Port Switch Stratix 2000 Redundant Star – Switch-level (MSTP, EtherChannel, Flex Links) X Ring – Switch-level (MSTP, REP) Ring – Device-level (Device Level Ring Protocol - DLR) Star – Switch-level (None) Linear Switch-level and Device-level Topologies Controllers, Drives, and Distributed I/O Cell/Area Zone

Network Resiliency Protocols Layer 2
Device-level Topology Ring Embedded switch technology EtherNet/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 (rPVST+) - Cisco Technology Ring Only Resilient Ethernet Protocol (REP) – Cisco Technology Redundant Star Only EtherChannel Link Aggregation Control Protocol (LACP) - IEEE Flex Links – Cisco Technology Ethernet: IEEE 802.3 Fast Ethernet: IEEE 802.3u and 100BASE-TX Gigabit Ethernet: IEEE 802.3z and 802.3ab IEEE D Spanning Tree Protocol IEEE 802.1w rapid reconfiguration of spanning tree IEEE s multiple VLAN instances of spanning tree IEEE ad Link Aggregation Control Protocol (LACP) IEEE p CoS prioritization IEEE 802.1Q VLAN IEEE x user authentication

Hardware StackWise, Catalyst 3750x, stack management – Cisco Technology Hardware Device Resiliency Protocols Hot Standby Router Protocol (HSRP) – Cisco Technology Virtual Router Redundancy Protocol (VRRP) – IETF RFC 3768 Gateway Load Balancing Protocol (GLBP) – Cisco Technology (also a routing protocol) Routing protocols such as Open Shortest Path First (OSPF) and Enhanced Interior Gateway Routing Protocol (EIGRP) are resilient by nature

Catalyst 3750x Switch Stack Distribution switches typically provide first hop (default gateway) redundancy StackWise (3750X), stack management Hot Standby Router Protocol (HSRP) Virtual Router Redundancy Protocol (VRRP) Gateway Load Balancing Protocol (GLBP) Catalyst 3560 HSRP Active HSRP Standby

Network Resiliency Protocols Selection is Application Driven
Mixed Vendor Ring Redundant Star Network Convergence > 250 ms Convergence ms Convergence ms Layer 3 Layer 2 STP (802.1D) X RSTP (802.1w) MSTP (802.1s) rPVST+ REP EtherChannel (LACP 802.3ad) Flex Links DLR (IEC & ODVA) StackWise HSRP GLBP VRRP (IETF RFC 3768) This table is not all inclusive …. but it does provide some general guidelines …. again, choice of topology and resiliency protocol is application dependent as noted earlier Application Driven IACS Information Data … e.g. SCADA/HMI IACS Control Data … e.g. sensors, actuators, I/O, controller interlocking Topology – geographic dispersion Location within the hierarchal architecture Layer 2 vs. Layer 3 Legacy Connectivity & Migration – need for standard protocol Mixed Vendor Performance Network Convergence Latency & Jitter Tolerance Rockwell Automaton and Cisco recommend the use of fiber SFPs, small form-factor pluggables, to achieve the best convergence times More pertinent Redundant Star and Ring resiliency protocols are covered over the next few slides, starting with Redundant Star

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

Embedded Switch Technology Device-level Topologies
Linear Device-level Topology Port 1 Port 2 Ring Device-level Topology 2-port Embedded Switch

Layer 2 - Data Link Switching – Embedded Switch Technology
Note that the ControlLogix and CompactLogix L4x platforms can support multiple network interface cards (NICs) to segment network traffic. However, the CompactLogix 5370 platform is not capable of this method of network segmentation. The two ports of the CompactLogix 5370 PAC are part of an embedded switch, not a dual NIC. ENxTR ENxT’s CompactLogix 5370 ControlLogix ControlLogix Two port embedded switches allow data to pass through They are managed switches and mark QoS as well as calculate PTP Segmenting the network via multiple single port ENxT cards is only possible on the ControlLogix platform = ≠ PHY PHY = ≠

Embedded Switch Technology Device-level Topologies
802.3 operation Autonegotiation, with 10/100Mbps, Full/Half duplex Forced setting of speed/duplex 802.3 full duplex flow control Cut-through operation, with store & forward on contention QoS Multiple queues Prioritization via DSCP and 802.1Q/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 (E2E) Transparent Clock (TC)

Device Level Ring (DLR) Protocol Device-level Ring Topology
Layer 2 protocol Meaning that it’s transparent to higher level protocols Single-ring topology Fast fault detection and ring recovery Ring Supervisor Supervises the ring, one or more Normally a scanner or a dedicated supervisor Ring Node, Beacon-based Member of the ring Normally an adapter Usually a hardware assisted solution Ring Node, Announce-based Software implementation based on an commercial switch

The DLR defines a set of protocol messages and states Protocol messages: Beacon Neighbor_Check_Request Neighbor_Check_Response Link Status/Neighbor_Status Locate_Fault Announce Sign_On Node states: IDLE_STATE FAULT_STATE NORMAL_STATE Ring states: RING_FAULT_STATE RING_NORMAL_STATE

CompactLogix Controller Forwarding Active Ring Beacon Supervisor Beacon Stratix 5700 IE Switch Blocking Announce Announce ETAP ArmorPoint I/O PowerFlex POINT I/O POINT I/O Some IACS applications, such as safety and motion require network convergence times faster than what switch oriented resiliency protocols can provide IACS Device resiliency protocols, such as the Device Level Ring, DLR, provide network convergence in the 1-3 ms range for simple automation device networks Device Level Ring is a Layer 2 protocol that provides link-level, physical redundancy This is 2-port embedded switch technology managed by the ODVA, which Cisco and Rockwell Automation are principle members of 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 Once ring is restored, supervisor hears beacon on both ports, and transitions to normal ring mode, blocking one port

CompactLogix Controller Active Ring Supervisor Stratix 5700 IE Switch Link Failure ETAP Link Status Link Status ArmorPoint I/O PowerFlex POINT I/O POINT I/O 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

CompactLogix Controller Forwarding Forwarding Active Ring Supervisor Stratix 5700 IE Switch Link Failure ETAP ArmorPoint I/O PowerFlex POINT I/O POINT I/O After failure detection, ring supervisor unblocks blocked port Network configuration is now a linear topology Fault location is readily available via diagnostics

CompactLogix Controller Forwarding Active Ring Beacon Supervisor Stratix 5700 IE Switch Beacon Blocking Announce Announce ETAP ArmorPoint I/O PowerFlex Some IACS applications, such as safety and motion require network convergence times faster than what switch oriented resiliency protocols can provide IACS Device resiliency protocols, such as the Device Level Ring, DLR, provide network convergence in the 1-3 ms range for simple automation device networks Device Level Ring is a Layer 2 protocol that provides link-level, physical redundancy This is 2-port embedded switch technology managed by the ODVA, which Cisco and Rockwell Automation are principle members of POINT I/O POINT I/O Once ring is restored, supervisor hears beacon on both ports, and transitions to normal ring mode, blocking one port

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 Precision Time Protocol, Multicast Management) Ring is a single fault tolerant network Designed for 1-3 ms convergence for simple EtherNet/IP device networks

Resilient Ethernet Protocol (REP) Switch-level Ring Topology
REP segments apply to various Layer 2 Topologies A A Segment 2 C B B F Forwarding Segment 1 Blocking H Segment 1 D I C E K J E G D Segment 3 F

REP Segment Edge Port Edge Port A B C D E f1 f2 f1 f2 f1 f2 f1 f2 f1 f2 interface f2 rep segment 10 interface f1 rep segment 10 interface f2 interface f1 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

Edge Port f2 Blocks Traffic Edge Port A B C D E f1 f2 f1 f2 f1 f2 f1 f2 f1 f2 f2 Unblocks f2 Blocks Traffic f2 Blocks Traffic Link Failure A B C D E f1 f2 f1 f2 f1 f2 f1 f2 f1 f2 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

Forwarding C Blocking B A B A Forwarding 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

Rockwell Automation Stratix 5700/8000/8300 Cisco Catalyst 3000, 3750X, 4500, 4900M, and 4948

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 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 for both unicast and multicast traffic in fiber implementations Will not drop standard I/O connection Cisco innovation, included with Stratix 5700, and Stratix 8300 F B A Segment 1 C D E A Segment 2 C B H Segment 1 D I K J E G F Segment 3

Ring Resiliency Protocols – Summary Switch-level & Device-level Topologies
Rapid Spanning Tree Protocol (RSTP) <1 sec recovery time Resilient Ethernet Protocol (REP) Ring Topology <80 ms recovery time Device Level Ring (DLR) Beacon Protocol 1-3 ms recovery time REP, RSTP DLR

Representative Configurations Resiliency Protocols and Redundant Path Topologies
Production - VLANs IP Camera - VLAN Catalyst 3750 StackWise Switch Stack Industrial Zone Level 3 HMI Cell/Area Zones VLAN 103 Levels 0–2 Layer 2 Access Link Camera Layer 2 Interswitch Link/802.1Q Trunk Stratix 5700/8000/8300 REP CIP Class 1 & 3 VLAN 43 Safety Controller HMI I/O Controller I/O VFD Drive VFD Drive Controller Controller I/O Camera VLAN 103 VLAN 43 I/O Safety I/O I/O Servo Drive HMI Instrumentation VLAN 104

Representative Configurations Resiliency Protocols and Redundant Path Topologies
Production - VLANs IP Camera - VLAN Catalyst 4500s Industrial Zone HSRP Level 3 HMI Cell/Area Zones VLAN 103 Levels 0–2 Layer 2 Access Link Camera Layer 2 Interswitch Link/802.1Q Trunk Stratix 5700/8000/8300 REP CIP Class 1 & 3 VLAN 43 Safety Controller HMI I/O Controller I/O VFD Drive VFD Drive Controller Controller I/O Camera VLAN 103 VLAN 43 Safety I/O I/O I/O Servo Drive HMI Instrumentation VLAN 104

Spanning Tree Protocol Switch-level Redundant Star Topology
Only IEEE standard protocol for network resiliency - IEEE 802.1D Built into Stratix 5700/8000/8300 Provides: Loop-free network Redundancy in case of failure Ring and Redundant Star Topology Operates in a plug-and-play fashion STP, RSTP, MSTP & rPVST+ Differences Unmanaged switches don’t support STP Coordinate with IT before implementing Distribution Switch Catalyst 3750 Switch Stack F B F B A redundant connection kills a bridged network Layer 2 packets do not have a time-to-live (TTL) A single packet can take the whole bandwidth Though, we want to keep parallel links for redundancy The rapid Spanning Tree protocol is a layer 2 algorithm adopted into IEEE 802.1D in 1998 and enhanced a few times; this protocol provides the following: Loop-free network Keeps the redundancy in case of failure Operates in a plug-and-play fashion Stratix 8000 Access Switches F - Forwarding B - Blocking

EtherChannel Switch-level Redundant Star Topology
Link Aggregation Control Protocol (LACP) port aggregation – IEEE ad Redundant Star Topology Built into Stratix 5700/8000/8300 A way of combining several physical links between switches into one logical connection to aggregate bandwidth via load balancing (2 to 8 ports) Provides resiliency between connected switches if a connection is broken Unmanaged switches don’t support this concept Coordinate with IT before implementing Distribution Switch Catalyst 3750 Switch Stack F F F F EtherChannel – terminology for port aggregation … combining multiple physical switch ports into one logical connection … providing increased bandwidth through load balancing as well as physical connection redundancy Layer 2 protocol with two versions … Cisco …. Port Aggregation Protocol (PAgP) IEEE …. Link Aggregation Control Protocol (LACP) Rockwell Automation & Cisco recommends LACP to provide the greatest interoperability Notice the representative configuration on the right, the physical connections are identical to that of Spanning Tree, but the switch configuration is different EtherChannel is configured on both the Stratix 8000 Access Switches and the 3750 switch stack This feature allows grouping several physical Ethernet links to create one logical Ethernet link for the purpose of providing fault-tolerance and high-speed links between switches, routers and servers. An EtherChannel can be created from between two and eight active Fast Ethernet, or Gigabit Ethernet ports. Fault-tolerance is a key aspect of EtherChannel. Should a link fail, the EtherChannel technology will automatically redistribute traffic across the remaining links. This automatic recovery takes less than one second and is transparent to network applications and the end user. This makes it very resilient. STP can be used with an EtherChannel. STP treats all the links as a single connection. Without the use of an EtherChannel, STP would effectively shutdown any redundant links between switches until one connection goes down. This is where an EtherChannel is most desirable, it allows full use of all available links between two devices. Stratix 8000 Access Switches F - Forwarding

Flex Links Protocol Switch-level Redundant Star Topology
Cisco Technology Redundant Star Topology Built into Stratix 5700/8000/8300 Active/Standby Port Scheme Provides alternate path in case of failures, avoiding loops No bandwidth aggregation Applied to the Stratix Access Switch Recommend using equal speed ports Provides fast fail over for multicast traffic Unmanaged switches don’t support this concept Coordinate with IT before implementing Distribution Switch Catalyst 3750 Switch Stack A S A S Layer 2 protocol that provides link-level, physical redundancy This is a Cisco innovation and is being applied by Cisco and Rockwell Automaton to Redundant Star topologies for automation applications Pair of Layer 2 interfaces, switchports, configured to act as backup to each other Notice the representative configuration on the right, the physical connections are identical to previous two - Spanning Tree and EtherChannel, but the switch configuration is different Flex Links is configured on the Stratix 8000 Access Switches, not the 3750 switch stack Rockwell Automation and Cisco recommend Flex Links for Redundant Star automation applications due to it’s quicker network convergence time Now that we’ve covered a few of the Redundant Star resiliency protocol, lets discuss several Ring resiliency protocol Stratix 8000 Access Switches A - Active S- Standby

Redundant Path Topology and Resiliency Protocol Summary
Topology / Resiliency Protocol Stratix 5700/8000/8300 Stratix 6000 Embedded 2-Port Switch Stratix 2000 Redundant Star – Switch-level (MSTP, EtherChannel, Flex Links) X Ring – Switch-level (MSTP, REP) Ring – Device-level (Device Level Ring Protocol - DLR) Star – Switch-level (None) Linear Use Fiber SFPs for Interswitch Links – Ring and Redundant Star Switch-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, ControlLogix Redundancy and CIP Motion

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 EtherNet/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

EtherNet/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 EtherNet/IP products require conformance testing Standard – IEEE 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 Device-level and switch-level topologies; copper - fiber - wireless Portability and routability – seamless plant-wide / site-wide information sharing No data mapping – simplifies design, speeds deployment and reduces risk

Additional Material Website: Media Planning and Installation Manual
Media Planning and Installation Manual Network Infrastructure for EtherNet/IP: Introduction and Considerations Device Level Ring The CIP Advantage

Additional Material Networks Website: http://www.ab.com/networks/
EtherNet/IP Website: Media Website: Embedded Switch Technology Website: Publications: ENET-AP005-EN-P Embedded Switch Technology Manual ENET-UM001G-EN-P EtherNet/IP Modules in Logix5000 Control Systems …. provides connection and packet rate specs for modules ENET-WP0022 Top 10 Recommendations for plant-wide EtherNet/IP Deployments ENET-RM002A-EN-P Ethernet Design Considerations Reference Manual ENET-AT004A-EN-E Segmentation Methods within the Cell/Area Zone ENET-RM003A-EN-P Embedded Switch Technology Reference Architectures ENET-WP030A-EN-E Choosing the correct Time Synchronization Protocol Network and Security Services Website:

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 EtherNet/IP Solutions Available Online /products-technologies/network-technology/architectures.page? People and Process Optimization: This Series is part of an overall collaboration between Cisco and Rockwell Automation to facilitate convergence between Industrial and Enterprise Networks. The intent of the Education Series is to provide a common reference and understanding on terminology between IT professionals and Control Engineers to facilitate dialogue. Education to facilitate Industrial and IT convergence and help enable successful architecture deployment and efficient operations allowing critical resources to focus on increasing innovation and productivity. Rockwell Automation and Cisco encourages that IT and Control Engineers watch these video on demands (VoDs) together. Remember, it’s all about facilitating dialogue

Additional Material Websites Design Guides Application Guides
Reference Architectures Design Guides Converged Plant-wide Ethernet (CPwE) Application Guides Fiber Optic Infrastructure Application Guide Education Series Webcasts Whitepapers Top 10 Recommendations for Plant-wide EtherNet/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 Automation and Control System Networks - ENET-WP031A-EN-E

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

Plant-wide Benefits of EtherNet/IP Seminar
Fundamentals of Network Resiliency and Redundant Path Topology for EtherNet/IP Plant-wide Benefits of EtherNet/IP Seminar

Plant-wide Benefits of EtherNet/IP Seminar

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