Reliability in White Rabbit Network
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1 Reliability in White Rabbit Network Maciej Lipiński Hardware and Timing Section / Institute of Electronic Systems CERN / Warsaw University of Technology February 8 & 9, 2013 Wilga Symposium Warsaw Maciej Lipiński White Rabbit 1/21
2 Outline 1 Reliability in WRN 2 Redundancy 3 Determinizm 4 Standardization 5 Status and Plans Maciej Lipiński White Rabbit 2/21
3 White Rabbit: Time + Data Whtie Rabbit provides: High accuracy/precision synchronization Deterministic, reliable and low-latency Control Data delivery Maciej Lipiński White Rabbit 3/21
4 Reliability in a White Rabbit Network Maciej Lipiński White Rabbit 4/21
5 Control Data Two types of data: Control Data (High Priority, HP) Standard Data (Best Effort) Failure of Control Data delivery: medium imperfection network element failure exceeded latency Maciej Lipiński White Rabbit 5/21
6 Data Redundancy Forward Error Correction (FEC) additional transparent layer: One Control Message encoded into N Ethernet frames, Recovery of Control Message from any M (M<N) frames Maciej Lipiński White Rabbit 6/21
7 Data Redundancy Forward Error Correction (FEC) additional transparent layer: One Control Message encoded into N Ethernet frames, Recovery of Control Message from any M (M<N) frames FEC can prevent data loss due to: Maciej Lipiński White Rabbit 6/21
8 Data Redundancy Forward Error Correction (FEC) additional transparent layer: One Control Message encoded into N Ethernet frames, Recovery of Control Message from any M (M<N) frames FEC can prevent data loss due to: bit error Maciej Lipiński White Rabbit 6/21
9 Data Redundancy Forward Error Correction (FEC) additional transparent layer: One Control Message encoded into N Ethernet frames, Recovery of Control Message from any M (M<N) frames FEC can prevent data loss due to: bit error network reconfiguration Maciej Lipiński White Rabbit 6/21
10 Topology Redundancy Standard Ethernet solution: Spanning Tree Protocol (STP) Maciej Lipiński White Rabbit 7/21
11 Topology Redundancy Standard Ethernet solution: Spanning Tree Protocol (STP) Reconfiguration time: 1s (best: milliseconds) Maciej Lipiński White Rabbit 7/21
12 Topology Redundancy Standard Ethernet solution: Spanning Tree Protocol (STP) Reconfiguration time: 1s (best: milliseconds) 1s = frames lost Maciej Lipiński White Rabbit 7/21
13 Topology Redundancy Standard Ethernet solution: Spanning Tree Protocol (STP) Reconfiguration time: 1s (best: milliseconds) 1s = frames lost Extensive research Maciej Lipiński White Rabbit 7/21
14 Topology Redundancy Standard Ethernet solution: Spanning Tree Protocol (STP) Reconfiguration time: 1s (best: milliseconds) 1s = frames lost Extensive research Solution: take advantage of FEC speed up STP >erstp Maciej Lipiński White Rabbit 7/21
15 Reliable Data Distribution erstp+fec=seamless redundancy <=> max 2 frames 500 bytes message (288 byte FEC) max re-conf 2.3us Requires: hardware support protocol modification Maciej Lipiński White Rabbit 8/21
16 Reliable Data Distribution Two solutions considered: enhanced Rapid Spanning Tree Protocol (erstp) enhanced Link Aggregation Control Protocol (elacp) Common gateware: universal and decoupled HDL unit Specific software: daemon+protocol Maciej Lipiński White Rabbit 9/21
17 Topology Resolution Unit (TRU) universal unit for topology resolution protocol port switch-over between redundant ports (erstp) traffic distribution between redundant ports (elacp) fully pipelined (3 cycles to answer, each cycle new request) Maciej Lipiński White Rabbit 10/21
18 Determinism and low latency Maciej Lipiński White Rabbit 11/21
19 Determinism and low latency Key switch modules require: Deterministic behavior Ultra low latency for Control Data Maciej Lipiński White Rabbit 12/21
20 Routing Table Unit Fully deterministic and non-dropping for Control Data Fast Match Engine PTP/broadcast/Link-limited/configurable MACs traffic configurable hardware support for Control Data response in max (N+5) cycles interface with TRU Maciej Lipiński White Rabbit 13/21
21 Switching Core optimization (wire speed) separation resources for Control Data improvement output queues scheduling (decoupled) implementation of time-triggered output scheduling interface with TRU Maciej Lipiński White Rabbit 14/21
22 Reliability in a White Rabbit Network Maciej Lipiński White Rabbit 15/21
23 White Rabbit and Standards We want to be as standards as possible (erstp) We want to standardize (WRPTP) Many possibilities: ITU-T IEEE AVB gen2 Standardization Group John Eidson ITU-T people Companies Maciej Lipiński White Rabbit 16/21
24 ISPCS2012 IEEE Conference in San Francisco All about PTP Implementations Innovations Standard issues Consists of PlugFest Paper Presentation Special Session Maciej Lipiński White Rabbit 17/21
25 ISPCS2012 PlugFest Individual tests PTP network tests Bug-fixes Paper Presentations Special Session Maciej Lipiński White Rabbit 18/21
26 ISPCS2012 PlugFest Individual tests PTP network tests Bug-fixes Paper Presentations WR Session 2 papers 1 poster Special Session Maciej Lipiński White Rabbit 18/21
27 Reliability in WRN Redundancy Determinizm Standardization Status and Plans ISPCS2012 PlugFest Paper Presentations Individual tests WR Session PTP network tests 2 papers Bug-fixes 1 poster Maciej Lipin ski White Rabbit Special Session 18/21
28 Reliability in WRN Redundancy Determinizm Standardization Status and Plans ISPCS2012 PlugFest Paper Presentations Special Session Individual tests WR Session WR Proposal PTP network tests 2 papers Warm reception Bug-fixes 1 poster Strong support Maciej Lipin ski White Rabbit 18/21
29 Standardization Plans WRPTP erstp strongly supported by many 2-3 April IEEE meeting to start working on PTP revision Project Authorization Request interest from many companies consultancy similar to newest developments of IEEE (e.g. AVGgen2) Maciej Lipiński White Rabbit 19/21
30 Status Deterministic Packet Delivery Cut-through Separate resources Output queuing Optimization Topology redundancy Extensive study Hardware(eRSTP) Software(eRSTP) Data Resilience FEC Encoder - more work FEC Decoder Maciej Lipiński White Rabbit 20/21
31 Questions and answers Maciej Lipiński White Rabbit 21/21
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