Transcript An evolutionary approach to G

An evolutionary approach to G-MPLS
ensuring a smooth migration
of legacy networks
Ben Martens
Alcatel USA
Core Network Evolution
Traditional Core Networks
SML
Layer 3
Layer 2
NML
EML
NML
EML
Layer 0
NML
EML
Layer 1
Voice
SML
SML
VPN
IP
FR
switch
IP
router
Voice
exchange
SML
ATM
SML
Leased
Lines
Variety of
Networks
(TDM, ATM, FR, IP)
IP Management
ATM
switch
ATM
switch
ATM
switch
ATM Management
TDM transport
SONET/SDH Digital ADM and DCS
SDH/SONET
Management
DWDM terminal multiplexers
OTN Management
NML: Network Management Layer
EML: Element Management Layer
SML: Service Management Layer
Core Network Evolution
Vision of the New Millennium
0 Sublayer
Layer
Layer
Transport
Layer1
Transport
NML
EML
NML
EML
Leased
Leased
Lines
ATM Lines
Voice
IP
router
ATM
switch
SML
ServiceVariety
Convergence
of
onNetworks
Enhanced
(TDM,IP
ATM,
layerFR, IP)
Network
Low / Medium
Consolidation
Capacity
through
Scalable
Nodes
Terabit
Nodes
IP
NML
IP FR
switch
EML
router
Voice
NML
EML exchangeDiffServ
ATM
NML
MPLS
switch
EML
SML
FR
VPN
SML
Voice
2 Sublayer
Layer
Layer 3
Service
Layer
Service
IP
SML
Voice
SML
ATM
switch
TDM transport
TDM transport
SONET/SDH
ADM and DCS
Optical Digital
cross connects
Optical add drop multiplexers
DWDM terminal multiplexers
DWDM Terminal Multiplexers
Complex
All
Optical
Transmission
Transport
Network
Layer
Cumbersome
Intelligent
Service
Optical
Networking
Provisioning
Integrated Cross
Fragmented
Technology
Network
Network
Management
Management
Intelligent Optical Networking
A New Networking Paradigm

Traditional Provisioning
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•
•

IP network using MPLS-TE
Optical circuits controlled by TMN
no co-ordination between IP and
Optical domain
Optical Internetworking
IP TE
OXC with embedded
‘ routers’
Intelligent Optical Networking
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•
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•
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 ADM
DWDM
Mux/Demux
SONET
DWDM
 setup
request
GMPLS or
O-UNI
OADM

Protection
GMPLS Control Plane
ISP 3
ISP 1
O-UNI
ISP 2
O-UNI
Client LSR
signals for
an explicit
Untrusted
optical path
interfaces
using GMPLS
signalling
MPLS TE-LSP
runs over optical path
ISP 1
O-UNI
ISP 2
Or client LSR
signals
connectivity
requirements
using O-UNI
Setup of
optical path
GMPLS models
Peer (Integrated)
Single routing domain for all routers
and optical cross-connects
Single operator owning IP and
Optical network
Overlay
No topology information has to be
shared between domains
Optical network can serve multiple
client networks
Hybrid
Combining Overlay and Peer
IP/Optical operator can also provide
wholesale services
Operator 1
Operator 2
Operator
3
UNI
UNI
UNI
UNI
Evolution approach to Intelligent
Optical Networking

Short term: centralized implementation of an automatically
controlled transport network
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Centralized provisioning (TMN)
Add UNI interface to the management system in the optical network
(indirect signaling interface)
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•
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•

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...
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•
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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
IP Service
Management
- TE Tool -
Transport
Management
OIF UNI

Focussing on traffic engineering
•
Other client’s
applications
•

Dynamic connectivity driven by IP
traffic patterns
•
•
Any Transport
network
Use of service management system to
handle service level agreements
between client and Transmission
Use of OIF UNI - lightpath
create/delete/query/...
Dynamic path set-up process
Optical as well as SDH/SONET transport
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:
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•
•
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•

Ease inter-operability using the OIF UNI standard Protocol
across
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•

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
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
•
IP Service
Management
Transport
Management

CrossConnect fully GMPLS enabled
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•
•

OXCs with
embedded GMPLS
controller
OIF
UNI
GMPLS Control Plane
Link Management Protocol
Capable to support peer and/or overlay
model
Role of Transport Management
•
OIF
UNI
Optical Crossconnect as key component
of the core
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•
No longer involved with setting up
individual connections
Deals with SLAs
Can be used to support transport VPNs
(lambda service)
GMPLS / Non-GMPLS Inter-Networking

•
Transport
Management
IP Service
Management
OIF
UNI

GMPLS
proxy
Focussing on Interworking
Keep todays value-added
services
•

Transport domain manager covers
lambda provisioning, protection &
restoration capabilities in nonGMPLS networks
Add network migration procedures
Role of Transport Management
•
Not only network management but
source of network intelligence
OIF
UNI
Non-GMPLS
subnet
O-UNI
7770 RCP
GMPLS
subnet
Conclusion

Core network evolution calls for
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•

Maximizing profitability drives the need for
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Next generation high capacity core routers
Intelligent Optical Networking
Fast service deployment
Service differentiation
Reduced OPEX
OIF and GMPLS concepts applicable to current generation
core networks
Installed base calls for evolution strategy