An evolutionary approach to G-MPLS ensuring a smooth migration of legacy networks Ben Martens Alcatel USA

Core Network Evolution Traditional Core Networks SML SML SML SML SML Variety of Networks (TDM, ATM, FR, IP) Leased Lines Voice VPN IP ATM Layer 3 NML EML Voice exchange FR switch IP router ATM switch IP Management Layer 2 ATM Management NML EML ATM switch ATM switch Layer 1 SDH/SONET Management NML EML TDM transport SONET/SDH Digital ADM and DCS Layer 0 OTN Management DWDM terminal multiplexers NML: Network Management Layer SML: Service Management Layer EML: Element Management Layer

Core Network Evolution Vision of the New Millennium SML SML SML SML SML Service Convergence on Enhanced IP layer Variety of Networks (TDM, ATM, FR, IP) Leased Lines Leased Lines IP VPN Voice ATM Layer 3 Network Consolidation through Scalable Terabit Nodes NML EML Voice exchange IP router DiffServ MPLS Low / Medium Capacity Nodes FR switch IP router Voice Voice Voice FR IP NML EML Service Sublayer Service Layer ATM switch All Optical Transport Network Layer 2 Complex Transmission Layer NML EML ATM switch ATM switch Layer 1 Cumbersome Service Provisioning Intelligent Optical Networking NML EML TDM transport SONET/SDH Digital ADM and DCS Optical cross connects Optical add drop multiplexers DWDM terminal multiplexers TDM transport NML EML Transport Sublayer Transport Layer Integrated Cross Technology Network Management Layer 0 Fragmented Network Management DWDM Terminal Multiplexers

Intelligent Optical Networking A 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 Optical Internetworking IP TE OXC with embedded ‘l routers’  setup request GMPLS or O-UNI OADM ADM DWDM Mux/Demux l Protection SONET DWDM

GMPLS Control Plane ISP 3 ISP 1 ISP 2 Client LSR signals for ISP 1 O-UNI O-UNI Client LSR signals for an explicit optical path using GMPLS signalling ISP 1 O-UNI Setup of optical path Untrusted interfaces Or client LSR signals connectivity requirements using O-UNI ISP 2 MPLS TE-LSP runs over optical path

GMPLS models Peer (Integrated) Overlay Hybrid Single routing domain for all routers and optical cross-connects Single operator owning IP and Optical network UNI Overlay No topology information has to be shared between domains Optical network can serve multiple client networks UNI Hybrid Combining Overlay and Peer IP/Optical operator can also provide wholesale services Operator 1 Operator 2 Operator 3

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.

Centralized Management Approach 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 IP Service Management - TE Tool - Transport Management Other client’s applications OIF UNI Any Transport network

New role for Transport Management 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

The intelligent optical network 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) IP Service Management Transport Management OIF UNI OXCs with embedded GMPLS controller OIF UNI

GMPLS / Non-GMPLS Inter-Networking 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 Transport Management IP Service Management GMPLS proxy OIF UNI Non-GMPLS subnet OIF UNI GMPLS subnet O-UNI 7770 RCP

Conclusion 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