Types and Characteristics of Packet Transport Network PTN

Types and Characteristics of Packet Transport Network (PTN) Equipment (Draft Recommendation - G. ptneq) Jia He and Hilmar Hofmann G. ptneq editors Geneva, 27 May 2010

Introduction Since 2002, the ITU-T has been developing recommendations for packet transport network architecture, equipment, OAM, NNI, protection and management with specific emphasis on technology such as Ethernet and MPLS The Ethernet recommendations have been developed in a close cooperation with IEEE 802. 1 These recommendations use functional decomposition/ components to describe packet transport networks Missing today is a recommendation which provides guidance on how to combine these functional components in equipment and networks This gap has been identified and a new recommendation G. ptneq is a work in progress Geneva, 27 May 2010 2

G. ptneq: Rationale The objective is to describe PTN equipment functionality independent of existing and future packet based technologies (ie. generic part) A second part is to describe technology specific equipment functionality such as Ethernet or MPLS-TP. Enable any PTN equipment to use common features: management plane control plane survivability schemes OAM behaviour PTN equipment built for different packet technologies shall have common characteristics Geneva, 27 May 2010 3

G. ptneq: Background ITU-T develops generic description of functional reference models for transport network equipment which are used in a Packet Transport Network to efficiently provide packet based services. The objective is: To provide a variety of equipment type examples (VC Term, VC Switch, VP Switch, etc. ) To describe the equipment using atomic functions To avoid constraints on the implementation PTN equipment types are described in terms of functional blocks Geneva, 27 May 2010 4

G. ptneq: Timetable Consent a recommendation by June 2010 which contains the basic concept and generic/technology agnostic information. Consent a second version in Feb 2011 which contains additional technology specific functionality (e. g. Ethernet, MPLS-TP). Geneva, 27 May 2010 5

G. ptneq: Scope This recommendation describes an overview of the functions of packet transport network (PTN) equipment and provides examples of various PTN equipment types. It is by no means restricting the way equipment may be built. G. ptneq does not mandate the way equipment should be built. Geneva, 27 May 2010 6

G. ptneq: Content Current draft version contains basic concept and generic/technology agnostic aspects. PTN Layer Hierarchy Functions to be supported on PTN equipment Multiplexing/Demultiplexing OAM and provisioning/management Protection switching Timing and Synchronization PTN Interface ports PTN Equipment types Geneva, 27 May 2010 7

G. ptneq: PTN Domain Model VC Term: demarcation between Client and carrier (PTN) Generation/Termination of VC layer VC Switch: Switch function on VC layer Generation/Termination of VP layer VP Switch function on VP layer Geneva, 27 May 2010 8

G. ptneq: PTN Layer Hierarchy PTN provides up to 3 packet based layers Virtual Channel Layer Virtual Path Layer Virtual Section Layer (as part of the transmission media layer) Client/Server Mode: customer’s signal is treated as a client layer signal of the PTN VC layer and is encapsulated into the PTN VC signal Geneva, 27 May 2010 9

G. ptneq: PTN Layer Hierarchy Peering Mode customer’s signal is passed through the PTN VC layer without encapsulation only a subset of clients that must be of the same technology as PTN VC can be supported Geneva, 27 May 2010 10

G. ptneq: PTN Layer Hierarchy for multiple domains Domain 1 Domain 2 Domain 3 VC VP VC VS VP VS Geneva, 27 May 2010 In multi-domain case the layer relationship is relative. VP in Domain 1 is VC Domain 2 VS in Domain 1 is VP Domain 2 VP in Domain 2 is VC Domain 3 VS in Domain 2 is VP Domain 3 in in 11

Next Step PTN VC/VP/VS layers may be supported by the Ethernet technology including ETH OAM(Y. 1731, G. 8021), ETH protection switching(G. 8031, G. 8032), ETH connection management (G. 8051, G. 8052). The use of Ethernet technology in PTN requires an extension of the tagging option defined in 802. 1 Q to support VC, VP, VS stacking in single and multi-domain scenarios. ITU-T Q 9/15 would like to progress this work in cooperation with IEEE 802. 1 Geneva, 27 May 2010 12

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Backup Slides

G. ptneq: Generic overview of PTN functional Model Geneva, 27 May 2010 15

G. ptneq: Port Model Examples Geneva, 27 May 2010 16

G. ptneq: Port Model Examples (contd. ) Geneva, 27 May 2010 17