Geneva, Switzerland, 13 July 2013

Ethernet Protection and Packet Synchronization

http://www.itu.int/en/ITU-T/Workshops-and-Seminars/ethernet/201307/Pages/default.aspx

Joint IEEE-SA and ITU Workshop on

Geneva, Switzerland, 13 July 2013

Moderator SummaryEthernet Protection Summary

Ghani Abbas, Ericsson – ITU-T SG15 vice chair

Steve Haddock – IEEE 802.1 Interworking chair

Glenn Parsons, Ericsson – IEEE 802.1 vice chair

Joint IEEE-SA and ITU Workshop on Ethernet

Geneva, Switzerland, 2 13 July 2013 3

Summary ….. 1/2

IEEE 802.1AX LAG is being revised to provide node and link redundancy, address dual-homed interconnects, and congruent per-service traffic distribution. Expected Standards 1H2014New Project p802.1CB started to identify and replicate frames and eliminate these frames in seamless protection schemeNew project p802.1 Qca -Path Control and Reservation (PCR) started. It leverages SPB for explicit Path establishment as well as reservation and redundancy

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G.Supplement 52 for G.8032 was approved. It provides scenarios for:

- Ethernet services support- Ring interconnections- Network applications and use cases

New work G.mdsp provides protection interworking for UNI/NNI network scenarios using ITU approved protection schemes (OTN and Ethernet)MECP is under study. It addresses protection

of single rooted-multipoint (RMP) Ethernet connections in Ethernet transport networks.

Summary …..2/2

Geneva, Switzerland, 13 July 2013

Moderator SummaryPacket Synchronization

Jean-Loup Farrant – ITU-T SG15 Q13 rapporteur

Michael Johas Teener – IEEE 802.1 TSN chair

Joint IEEE-SA and ITU Workshop on Ethernet

Geneva, Switzerland, 13 July 20136

G.8265.1(PTPprofileFrequency)

G.8275.1(PTPprofile1Time/phase)

Basics

Clock

Methods

Profiles

Frequency: G.826x Time/Phase:G.827x

G.8265.m(PTP Profile frequency m)

G.8261.1(NetwkPDV_frequency)

G.8271.1(Network limits_time/phaseNetwork

requirements

SyncE Jitter-Wander: (Included in G.8261)

G.8261 G.8271

G.8272PRTC

G.8273

G.8275 (architecture-time)

G.8262 (SyncE)

G.8264 (SyncE-architecture-SSM)

G.8265 (architecture-Frequency)

G.8275.2(PTPprofile2Time/phase )

G.8271.2(profile2)

Definitions /terminology

G.8260 (Definition)

73.1 GM

73.2 BC

73.3 TC

G.8260 AppI(metrics)

Overview of Q13 recommendations

OngoingAgreed

G.8263(slave clock) 73. x,y,z

G.supp

Summary of the Synchronization sessions -1IEEE 1588 Revision

Fix existing problems, remove inconsistanciesImprove accuracy, security, configuration and MIBsLayered architecture, but backwards compatibleBackward compatibility is very important for operators

IEEE 802.1AS RevisionAdditional link types, link aggregationRedundancy and faster reconfigurationArchitectural convergence with 1588

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Summary of the Synchronization sessions -23

IEEE Issue One step clockOne-step clock implies the implementation of hardware that greatly reduces the processor requirements for synch and delay processingBackwards compatibility a requirement

IEEE 1588 simulations for G.827x & 802.1AS

The proposed G.827x and 802.1AS profiles will meet their goalsPartial support still to be performed in ITU

Geneva, Switzerland,13 July 2013 8

Summary of the Synchronization sessions -3

Network limits-Asymmetry Asymmetry remains one of the main issues in the transport of time. Partial support might add new sources of asymmetry

Synchronization network architectureKey aspects of NGN synchronization

Packet network infrastructureNew synchronization requirements New methodsNew clock structuresArchitecture helps see how all pieces fit together

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Summary of the Synchronization sessions - 4

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802.1Q Stream reservation protocoldeterministic operation requires that resources are available

based on 802.1Q Multiple Registration Protocol

talkers advertise the streams that they can source

Important side-effect sets up a reservation « domain »

listeners register for streamsNew work under way

static reservations, faster startup, big reduction in packet traffic, support for new shapers, more management

Summary of the Synchronization sessions - 5

802.1Qbv scheduled trafficScheduling stream transmission can greatly reduce delays through switchesCut-through makes senseManagement of schedule is not a plug-and-play operation, it will require intelligence

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Summary of the Synchronization sessions -6

G.8275.x profilesG.8275.x time PTP telecom profiles are designed to support the needs of current and future mobile technologiesG.8275.1 (full timing suport) will be finalized soon, G.8275.2 (partial timing support) is just starting

Geneva, Switzerland,13 July 2013

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