An evolutionary approach to G-MPLS ensuring a smooth migration

of legacy networks

Ben MartensAlcatel USA

Core Network EvolutionTraditional Core Networks

Layer

0La

yer

1

TDM transportSONET/SDH Digital ADM and DCS

Layer

2La

yer

3

Voiceexchange

ATMswitch

ATMswitch

FRswitch

ATMswitch

IProuter

DWDM terminal multiplexers

SML

Voice VPN IP ATMLeasedLines

NMLEML

NMLEML

NMLEML

SMLSMLSMLSML

NML: Network Management Layer SML: Service Management LayerEML: Element Management Layer

Variety ofNetworks

(TDM, ATM, FR, IP)

OTN Management

IP Management

ATM Management

SDH/SONET Management

FragmentedNetwork

Management

Integrated Cross Technology

Network Management

CumbersomeService

Provisioning

Intelligent Optical Networking

ComplexTransmission

Layer

All OpticalTransport Network

Low / MediumCapacityNodes

Network Consolidation

through Scalable Terabit Nodes

Layer

2La

yer

3

Variety ofNetworks

(TDM, ATM, FR, IP)

Core Network EvolutionVision of the New Millennium

Layer

0La

yer

1

TDM transportSONET/SDH Digital ADM and DCS

DWDM Terminal Multiplexers

VPNLeasedLines

Voiceexchange

ATMswitch

FRswitch

ATMswitch

IProuter

Serv

ice L

ayer

Service Convergence on Enhanced

IP layer

Tra

nsp

ort

Layer

Serv

ice S

ubla

yer

Tra

nsp

ort

Sub

layer

Optical cross connectsOptical add drop multiplexersDWDM terminal multiplexers

TDM transportNMLEML

NMLEML

NMLEML

NMLEML

NMLEML

SMLSMLSMLSMLSML

VoiceIPLeasedLines

IProuter

DiffServ MPLS

ATM

IPFR

Voic

e

Voic

e

Voic

eATMswitch

setuprequest

GMPLS orO-UNI

IP TE

Optical Internetworking

OXC with embedded ‘

routers’

Intelligent Optical NetworkingA New Networking Paradigm

Traditional Provisioning• IP network using MPLS-TE• Optical circuits controlled by TMN • no co-ordination between IP and

Optical domain Intelligent Optical Networking

• Evolution of transmission networks in a way that is beneficial to the creation and provisioning of services

• Automatically controlled transport networks

• New role for transport management• Distributed connection control

model

SONET

Protection

DWDM

ADM DWDMMux/Demux

OADM

GMPLS Control Plane

Untrusted interfaces

ISP 1

ISP 1

ISP 2

ISP 2

ISP 3

O-UNI

O-UNI

O-UNI

Client LSRsignals foran explicit

optical pathusing GMPLS

signalling

Or client LSRsignals

connectivityrequirementsusing O-UNI

Setup ofoptical path

MPLS TE-LSPruns over optical path

GMPLS models

Operator 1

Operator 2

Operator 3

UNI

UNI

Peer (Integrated)Single routing domain for all routers and optical cross-connectsSingle operator owning IP and Optical networkOverlayNo topology information has to be shared between domainsOptical network can serve multiple client networks

HybridCombining Overlay and PeerIP/Optical operator can also provide wholesale services

UNI UNI

Evolution approach to Intelligent Optical Networking

Short term: centralized implementation of an automatically controlled transport network

• Centralized provisioning (TMN)• Add UNI interface to the management system in the optical

network (indirect signaling interface)• Start on a boundary router or management system in the client

domain• e.g., out-of-fiber / out-of-band UNI

• Allows clients to query the server to set up light-paths • The server performs CAC, calculates & establishes the light-

path. Present architecture features...

• No direct signaling interface between routers and OXCs• applicable to non-GMPLS enabled networks• Aids in implementing complex capacity optimization schemes• The near-term provisioning solution in optical networks with

interconnected multi-vendor optical sub-networks.

OIF UNI

Focussing on traffic engineering

• Use of service management system to handle service level agreements between client and Transmission

• Use of OIF UNI - lightpath create/delete/query/...

Dynamic connectivity driven by IP traffic patterns

• Dynamic path set-up process• Optical as well as SDH/SONET

transport

Transport Management

IP ServiceManagement

- TE Tool -

Centralized Management Approach

Any Transport network

Other client’s applications

Allows the Operator to sell “bandwidth on demand” services to client ISPs and be Carriers’ Carrier

• Set-up of flexible and guaranteed optical services:• any-time (only when and for the time needed)• @any-point (supporting flexible topologies)• @any-type (with different flavors in terms of bandwidth,

protection, …)• with a guaranteed O-SLA

• bandwidth on demand services guaranteed according to an SLA that can be easily demonstrated

• with specific constraints (e.g., verification against O-VPN contract)

• Signaled from client Ease inter-operability using the OIF UNI standard

Protocol across• different vendors of Transport Networks • IP, ATM Clients and the Transport Network.

No impact on network elements

New role for Transport Management

The intelligent optical network

Transport Management

IP ServiceManagement

OXCs with embedded GMPLS

controller

OIF UNI

OIF UNI

Focussing on lambda processing

• Optical Crossconnect as key component of the core

CrossConnect fully GMPLS enabled

• GMPLS Control Plane• Link Management Protocol• Capable to support peer and/or

overlay model Role of Transport Management

• No longer involved with setting up individual connections

• Deals with SLAs• Can be used to support transport

VPNs (lambda service)

7770 RCP

O-UNI

GMPLS proxy

GMPLS / Non-GMPLS Inter-Networking

OIF UNI

Transport ManagementIP Service

Management

Non-GMPLSsubnet

GMPLSsubnet

OIF UNI

Focussing on Interworking• Transport domain manager

covers lambda provisioning, protection & restoration capabilities in non-GMPLS networks

Keep todays value-added services

• Add network migration procedures

Role of Transport Management

• Not only network management but source of network intelligence

Core network evolution calls for • Next generation high capacity core routers• Intelligent Optical Networking

Maximizing profitability drives the need for • Fast service deployment• Service differentiation • Reduced OPEX

OIF and GMPLS concepts applicable to current generation core networks

Installed base calls for evolution strategy

Conclusion