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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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.

8. 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

9. 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

10. 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

11. 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

12. 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