An evolutionary approach to G- MPLS ensuring a smooth migration of legacy networks Ben Martens Alcatel USA
Jan 15, 2016
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