geneva, switzerland, 13 july 2013 ethernet protection and packet synchronization ...
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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
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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
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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
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