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Jakovljevic 2012 01-17-ieee-802.1-deterministic-ethernet&unified-networking
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IEEE Workshop 17.1.2012 - Presentation on Deterministic Ethernet & Unfied Networking
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Jakovljevic 2012 01-17-ieee-802.1-deterministic-ethernet&unified-networking
1.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Ensuring Reliable Networks Deterministic Ethernet & Unified Networking Mirko Jakovljevic mirko.jakovljevic@tttech.com Never bet against Ethernet …
2.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 2 Ensuring Reliable NetworksAbout TTTech • Experts in time-triggered networks and architectures for aerospace and automotive applications • Premium development member - FlexRay and AUTOSAR • TTP and networking platforms for e.g. Boeing 787 • Experts in deterministic Ethernet (chip IP & switch design) • AFDX (ARINC664) • Deterministic time-sensitive streams with rate-constrained Ethernet communication • TTEthernet (SAE AS6802 Time-Triggered Ethernet) • Deterministic time-critical streams with synchronous Ethernet communication • Part of the core team working on Ethernet QoS Layer 2 standards at SAE (Society of Automotive Engineers)
3.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 3 Ensuring Reliable NetworksAbout TTTech ISO 26262 Automotive IEC 61508 Industrial EN 13849 Off-Highway DO 254/178 Aerospace IEC 60601 IEC 62304 Medical Market specific safety certification Boeing 787 NASA Orion Audi A8 Airbus A380 Bombardier CSeries Embraer Legacy 450 / 500 Distributed Platforms from TTTech
4.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 4 Ensuring Reliable Networks Rising Expectations on Networks and System Integration Modern society relies on integration of systems • Internet of things, M2M, smart systems, integrated architectures, … • Many integrated functions • Drive to reduce systems costs and flexibly share common resources (cloud computing) • Virtualization trends: many functions sharing common resources, increasingly „flat“ architectures • Minimize trade-offs and costs in integration of different functions • „The network is a distributed computer“ … • … or even better „the network is a fault-tolerant hard real-time computer“ • …or both PhysicalProcess PhysicalProcess
5.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 5 Ensuring Reliable Networks Rising Expectations on Networks and System Integration Networks gain importance in more integrated world • Network is core technology and glue logic for different functions with different QoS requirements • Beyond messaging, latency and jitter, the network capabilities impact: • Architecture and application design methodology • System complexity of „distributed computer“ and distributed applications • Integrated system lifecycle costs • Network capabilities impact the system robustness
6.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 6 Ensuring Reliable NetworksEthernet Everywhere … • Ethernet is an omni-present technology with strong cross-industry support today and guaranteed growth in the future • Evolving, but mature technology with exceptional evolutionary capabilities Real-time Ethernet networks today: • Special profiles or modifications / fragmentation of markets • Different networks for different applications
7.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 7 Ensuring Reliable Networks Requirements – Integrated Systems Our customers value both Ethernet and deterministic real- time communication: Determinism & Robust Performance • Predictable network behavior under different workload and faults – low latency and jitter (!) • Latency control for (rate-limiting traffic): • Fast control loops and predictable comunication performance • Jitter control for (scheduled traffic): • Further latency minimization (fixed latency) for time-critical streams • Integration of different traffic classes, synchronous & asynchonronous • Efficent virtualization of computing and networking resources
8.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 8 Ensuring Reliable Networks Requirements – Integrated Systems Determinism & Robust Performance • Fault-tolerant synchronization (fault hypothesis!) • Defined behavior, startup and recovery timing under different conditions • Robust separation of different distributed functions • Zero fail-over • Formal verification of mechanisms/algorithms
9.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 9 Ensuring Reliable Networks Requirements – Integrated Systems We start with the following assumptions: • There will be faults • There will be malicious faults • There will be rogue devices / non-compliant devices • There will be integrity issues • There will be propagation of faults and complex failure scenarios Meaning …. • Normal „as designed“ behavior is only a smaller portion of possible system states … • Impact on systems – consequences? • What happens if we add a new end station or function into the system? (scalability of safety, time-criticality …)
10.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 10 Ensuring Reliable Networks Ethernet as Real-Time, Deterministic & Unified Network How to make Ethernet not only convergence-enhanced, but completely unified networking technology? How to make Ethernet robust and viable for integration of different applications? (unified networking) • Support for standard LAN, low-jitter and low-latency applications sharing one Ethernet network • Time-, safety-, and mission-critical systems – stronger support at network levels • Communication capability for both embedded and IT applications, even in a shared network
11.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 11 Ensuring Reliable NetworksDeterministic Unified Ethernet Complementary hard RT communication capability • By adding scheduled hard RT streams we can reduce latency of critical streams, have lossless/congestion-free coommunication, while keeping all time-sensitive and best-effort traffic QoSinsharedEthernetnetworks
12.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 12 Ensuring Reliable Networks Capabilities: „Synchronous“ Communication System time available on switches and end stations • Scheduled traffic can have fixed latency and µs-jitter • Switch knows when the message is forwarded By controlling jitter we also minimize latency for critical streams • A large portion of latency in time-sensitive rate-limited communication is the jitter!
13.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 13 Ensuring Reliable Networks Deterministic Unified Ethernet Capabilities „Virtual links“ are forwarded through 100BASE-TX, 1000BASE-CX, 1000BASE-SX or other Ethernet physical layer connections „Synchronous“ and Asynchronous Traffic
14.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 14 Ensuring Reliable Networks Capabilities: Robust Partitioning for Deterministic Unified Ethernet Mechanisms: • Switch knows the traffic schedule for synchronous (TT) traffic • Switch knows about properties of time-sensitive traffic and possible time-violations e.g. for AFDX / ARINC664 (e.g. rate constrained – BAG, periodicity) or 802.1Qav • Switch knows when the best effort (asynchronous) traffic can be scheduled to prevent violation of temporal constraints for RC and TT Synchronous (TT) Time-Sensitive Traffic (RC) Asynchronous (Priority-Driven and/or Lossless) Traffic Scheduling Logic (Switch) Output Port Configuration for TT Traffic Configuration for RC Traffic Ethernet switch can predict future collisions, plan for their resolution, and protect time-critical and time-sensitive traffic!
15.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 15 Ensuring Reliable NetworksWhat is it good for? Native synchronous communication in packet-switched Ethernet networks • Strictly deterministic, hard RT, lossless communication • Congestion management per default • Latency for critical streams is defined and fixed, unaffected by other asynchronous traffic • Jitter control makes the difference! • Dynamic bandwidth release if packet not sent
16.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 16 Ensuring Reliable NetworksWhat is it good for? Impact on embedded system virtualization • Jitter control makes the difference! • Few powerful control units can handle Nx10 distributed functions • Higher processing power and bandwidth utilization • Less critical functions do not affect time-critical functions • e.g. MP3 player or video download will not influence operation of critical control system Important: Reliance on robust & continuous system time
17.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Page 17 Ensuring Reliable NetworksSummary Ethernet can handle any type of communiciation today Deterministic Unified Ethernet is possible today in safety- critical applications: • Example: Integration of SAE AS6802 „Time-Triggered Ethernet“ (synchronous communication, time-critical), ARINC 664/AFDX (rate constrained, time-sensitive), and best effort communication • The system uses fault-tolerant system synchronization trusted to work in avionics, space and defense systems IEEE 802.1 provides great platform and experience to create deterministic unified Ethernet networks capable of: • Time-critical, time-sensitive, best effort communication … • … for IT, embedded and critical infrastructure applciations • … and fully integrated with IEEE 802 suite of Ethernet standards
18.
Copyright © TTTech
Computertechnik AG. All rights reserved.www.tttech.com Ensuring Reliable Networks www.tttech.com Mirko Jakovljevic mirko.jakovljevic@tttech.com
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