Distributed Signalling and Distributed Signalling and Multiple - - PowerPoint PPT Presentation

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6

I nternational Telecom m unication Union

ITU-T

Distributed Signalling and Distributed Signalling and Multiple Transport Layers Multiple Transport Layers

S tephen S hew

S tandards and Control Plane Architecture, Nortel Director, OIF board

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 2

ITU-T

Outline

• Distributed signalling for transport
• S

ignalling standards and relationships

• Recent signalling work
• IETF – LS

P S titching

• OIF – interop of Ethernet/ Transport
• ITU-T - AS

ON multi-layer multi-S CN

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 3

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W hat is Signalling?

• S

ignalling is a function that creates calls and connections.

Call Request Connection Request Call Accept Connection Indication Path Computation function in Routing Component NCC CC CC CC NCC Call Accept

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Signalling in Transport Netw orks

• S

ignalling has existed for many years in telephony, ISDN, ATM, and MPLS .

• S

ignalling is extended for transport networks due to

• Fixed granularities – defined multiplexing hierarchy
• Protection functions in the data plane
• S

eparation of data plane from control and management planes

• Addressing/ Naming - S

eparation of spaces between data plane and control plane

• “ Connection” centric rather than “ Protocol” centric
• Connection exists even if control plane ceases

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Protocols and Architectures

• S

ignalling capabilities are implemented in protocols, whose pieces can be combined according to different architectures.

• Different S

DOs contribute pieces and architectures.

RFC Rec. RFC RFC IA IA

IETF ITU-T

RFC RFC RFC RFC RFC IA IA IA IA Rec.

Architectures OIF

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Signalling Standards

• Dynamic sig nalling and ro uting c o ntro l o ve r OT

N/ SONE T / SDH ne two rk.

• Dynamic sig nalling fo r E

the rne t se rvic e s using ASON I nte rlaye r arc hite c ture

Pr

• vide r

A Pr

• vide r

B Pr

• vide r

C

Clie nt Clie nt

OIF UNI OIF E

• NNI

GMPL S UNI ASON/ GMPL S i/ w

ASON Ar c hite c tur e G.8080 – c ontr

• l plane

G.805 – be ar e r plane GMPL S Ar c hite c tur e RF C 3945 OIF Signalling base d on G.7713, G.7713.2, G.7713.3 OIF E NNI r

• uting base d
• n G.7715, G.7715.1

E the r ne t se r vic e s base d on G.8010, G.8011, ME F .10 RF C 4139 RF C 4208 RF C 3472 RF C 3473 RF C 3946 RF C 4203

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 7

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I ETF CCAMP – LSP Stitching

• A Label Swit ched Path (LS

P) represents a data connection, and signalling state to support it.

• LS

P S titching allows an LS P to be treated as a single data/ signalling link.

S S S S-

• LSP

LSP LSP LSP S S S S-

• LSP

LSP LSP LSP End to end LSP End to end LSP End to end LSP End to end LSP Area 1 Area 1 Area 1 Area 1 Area 2 Area 2 Area 2 Area 2

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OI F I nterop Dem o Overview

• The OIF Worldwide Interoperability Demo

combined:

• Ethernet S

ervices

• Control plane
• Flexible Transport Bandwidth functions

To provide dynamic Et hernet services over a bandwidth efficient transport network

Control plane – a set of functions that act on a bearer (data) plane for the purpose of automated call/connection setup and release. Ethernet Services – Point-to-Point Private Line Data over transport - GFP, VCAT, LCAS

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I nterlayer Call Technology

• Client makes an Ethernet call to destinat ion
• Network triggers SONET/ S

DH calls to mat ch Ethernet service request

• Control plane sets up Ethernet and S

ONET/ S DH connections, and controls GFP/ VCAT

Clie nt UNI-C Clie nt UNI-C OXC UNI- N UNI- N OXC UNI- N UNI- N Ethernet Ethernet SONET/SDH

GF P VCAT

c onne c tions

GF P VCAT

E the r ne t c onne c tion Inte rlaye r c all invoke d E the r ne t c a ll SONE T / SDH c a ll E the r ne t c a ll progre sse s E the r ne t c a ll c omple te s

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I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 1

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I TU-T I nterlayer Architecture

• G.8080 has defined an interlayer archit ecture called a “ mapped

server” . Examples of its use are:

• Ethernet Private Line over S

DH

• VCAT layer
• Multiple Ethernet Private Line over one server connection

Eth 1 SDH 4 Ethernet Layer SDH Layer

S1 S2 C1 C2 C3

Eth 2 Eth 3 SDH 5

Architecture Example

NCC NCC NCC NCC NCC NCC NCC NCC

Ethernet Connection

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Multilayer m ulti-SCN Exam ple

• How do Client NCCs communicate when there are multiple

S ignalling Communication Networks present?

• One solution is to build a route of client NCCs while setting up

the server layer.

Eth 1 VC-4 Eth 3 VC-4

NCC-1 NCC NCC NCC-4 NCC NCC NCC NCC

SCN 1

SCN 3

SCN 2

ENNI

?

NCC-2 NCC-3

<NCC-2, NCC-3, NCC4> <NCC-2, NCC-3, NCC4>

I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 3

ITU-T

Thank You