Transcript Muckai Girish Presentation

Dynamic Service Provisioning in
Converged Network Infrastructure
Muckai Girish
Atoga Systems
1
Network Architecture
• Convergence is the trend
– Cost savings from equipment and operations
– Example: SONET, IP and DWDM
– Physical network layer convergence vs logical
layer convergence
– Multiple protocols still used for various
purposes
– Tight integration among the layers is
challenging and is typically the missing piece
February 19, 2001
2
Network Architecture Challenges
• Pockets/segments with miscellaneous network
architectures and overlays
• Mappings and co-ordination among the layers and between
networks are quite cumbersome
– Technology & protocol mappings
– QoS mappings
– Network management
• Time/reason/cost/inertia to migrate networks
– Product and solution evolution, stability, standardization processes
and market acceptance
– Type of service provider: greenfield, incumbent
– Economic and business factors lead to the final answer
February 19, 2001
3
Services
• Applications demand multiple service
grades
–
–
–
–
–
Gaining importance
End-to-end
Differing network treatments
Different optimization criteria
Significant technology improvements
February 19, 2001
4
Service Intelligence
Customer1
E-mail
Customer2
ERP
Customer3
Customer4
Internet Access
Hosting
Customer5
Local
Data
Customers
Long Dist
Voice
L3 Services
IP
Fast Ethernet
Gigabit Ethernet
Application
Services
POS
ATM
CT3
TDM
L2 Services
SONET
SONET
SONET
SONET
SONET
SONET
SONET Framing
WDM
WDM
WDM
WDM
WDM
WDM
WDM Services
Service
Lambdas
February 19, 2001
5
Service Providers’ QoS Objectives
• Provide a wide spectrum of QoS with SLA to meet
the needs of various services and applications
– Support connection-based QoS
• with stringent end-to-end guarantee on loss ratio, transfer
delay, and delay jitter
• with minimum QoS requirement and can exploit additional
network resources
– Support connectionless QoS
• differentiated services with multiple levels of drop precedence
• best-effort service
February 19, 2001
6
Challenges
• How to provide services in a converged
network infrastructure ?
–
–
–
–
Protocols
Tight integration between network layers
Network resource optimization
Translate the services’ requirements into the
network parameters and protocol attributes
– Ability to dynamically adapt to demand and
network topology changes
February 19, 2001
7
Dynamic Services
•
•
•
•
•
Topology and network architecture
Protocols
Signaling mechanisms
Protection mechanisms
Scaling and optimization
February 19, 2001
8
Dynamic Services
• Routing protocols for network reachability
and topology discovery
• Layer 2.x mechanism for traffic engineering
and QoS/tunneling
• SONET/Ethernet/other for framing
• DWDM for optical scaling
February 19, 2001
9
GMPLS
• GMPLS is slated to be one of the unifying
protocols for packet (IP), circuit
(SONET/TDM) and optical (DWDM)
technologies
– For example
• Data plane: MPLS for IP layer traffic engineering,
QoS and tunneling (VPN)
• Control plane: MPS for establishment of lightpaths
• Protection and Restoration: at the MPLS layer
February 19, 2001
10
Dynamic Services
• Services can be provisioned in a
hierarchical fashion
– IP layer bandwidth
– SONET/transport layer bandwidth
– WDM bandwidth
February 19, 2001
11
Tunable Optical Scaling
• Tunable lasers
– Emerging technology
– Ability to tune to any wavelength from a finite
set
– Enables the creation of multiple logical groups
in a physical topology
– Enables optical scaling by moving a node from
one logical group to another
February 19, 2001
12
Application Driven Provisioning
Insufficient Bandwidth
Must Dilate Pipe
Data Packets
Application
February 19, 2001
SONET
The Network
Layer
13
Tunable Optical Scaling
Insufficient
Splits the Bandwidth
Network
Into
at the
twoSONET
LogicalLayer
Rings
OC48
Data Packets
OC48
Application
February 19, 2001
The
WDM
Network
Layer
14
Tunable Reprovisioning
Switches
Splits the
Node
Network
to the
Into
Other
twoLogical
LogicalRing
Rings
Data Packets
Application
February 19, 2001
The
WDM
Network
Layer
15
Protection Mechanisms
• Converged networks offer choices in
protection layers
– WDM layer (Proprietary protection
mechanisms)
– SONET layer (UPSR, BLSR)
– Layer 2 (e.g., RPR)
– MPLS layer
– Challenges include service aware survivability
February 19, 2001
16
Conclusion
• New methods for dynamic service
provisioning and scaling in converged
network infrastructure
– Provides service guarantees for existing and
new applications
– Makes use of converged network architecture
– Tight integration between network layers
February 19, 2001
17