Performance evaluation of Threshold- based Multi-layer Traffic Engineering strategies ·...
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Performance evaluation of Threshold-
based Multi-layer Traffic Engineering
strategies
Víctor López1, Óscar González de Dios2, José Alberto Hernández1, Raúl Duque2, Carlos García Argos2, Javier Jiménez
Chico2, Juan Pedro Fernández-Palacios2, Javier Aracil1
1Universidad Autónoma de Madrid2Telefónica I+D
NOC - Friday, June12th 2009
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Outline
Motivation
Network evolution towards IP over GMPLS
• Control Plane
• Data Plane
Multi-layer Traffic Engineering Mechanisms
Impact of MTE on the IP over WDM architecture
Conclusions
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Motivation
Current backbone networks are migrating to an IP over WDM scenario.
Common control plane for IP and optical layers.
Open issues:• How should the IP and optical
resources be used?
• Which is the impact of MTE algorithms at network equipment?
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Outline
Motivation
Network evolution towards IP over GMPLS
• Control Plane
• Data Plane
Multi-layer Traffic Engineering Mechanisms
Impact of MTE on the IP over WDM architecture
Conclusions
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Transport plane legacy technology is SDH.
The main advantages of SDH with respect to
previous technologies are:
• (1) interfaces with optical fiber;
• (2) transmission rates up to 40 Gbps;
• (3) operational support;
• (4) fast restoration (50 ms);
• (5) grooming of multiple technologies
Evolution of IP and transport networks
Data Plane Control Plane Management Plane
DWDM
ASON MP
GMPLS
IP
IP over WDM Backbone solution
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Control plane: Interconnection models
Separated ModelIntegrated Model
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Data plane
IP Router
ROADM
Grey Interface
2nd window
Transponder (O/E/O conversion)
Colored interface
3rd window
IP Router with
integrated
transponder
ROADM
Colored interface
3rd window3rd window
SeparatedIntegration
Open Issues
•Interoperability problems
•Reduction of the DWDM equipment
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Outline
Motivation
Network evolution towards IP over GMPLS
• Control Plane
• Data Plane
Multi-layer Traffic Engineering Mechanisms
Impact of MTE on the IP over WDM architecture
Conclusions
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Multi-layer Traffic Engineering
Mechanisms
......
ROADM
IP Router
DWDM
Transponders
Router
Traffic
Pass-through
Traffic
LSPs electronically
routed
LSPs optically routed
LSPs grooming
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Architectural solutions
IP Node
Optical
Node
Multi-layer
Node
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Definition of MTE engineering
mechanismsDemands
Routing
algorithm
Find
possible
bypasses
1
2
Longest
firstLargest
first
6
3
45
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Definition of MTE engineering
mechanisms
10 Gbps
6 Gbps
6 Gbps
4 Gbps
10 Gbps
6 Gbps
Longest
first
Largest
first
2 63 5
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Outline
Motivation
Network evolution towards IP over GMPLS
• Control Plane
• Data Plane
Multi-layer Traffic Engineering Mechanisms
Impact of MTE on the IP over WDM
architecture
Conclusions
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Impact of MTE on the IP over WDM
architecture
Traffic Matrix ~ U[0,1]
• End-to-end traffic
scaled.
European network with
Multi-layer routers in
each node.
Routing mechanisms
SP and ECMP.
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ResultsWithout MTE
mechanismsMTE-Longest
MTE-LargestMTE-Longest
MTE-Largest
MTE-Longest
less congestion
more bypasses
MTE-Largest
more congestion
less bypasses
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Outline
Motivation
Network evolution towards IP over GMPLS
• Control Plane
• Data Plane
Multi-layer Traffic Engineering Mechanisms
Impact of MTE on the IP over WDM architecture
Conclusions
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Conclusions
Definition of two MTE algorithms to deal with the
congestion of the IP layer in network operator.
• Firstly use the already deployed IP resources.
Performance:
• Longest algorithm achieves a higher congestion reduction.
• Largest algorithm establishes less lightpaths.
Future work:
• Comparison of these mechanisms with cost oriented
optimization algorithm.
• Implementation of such algorithms in PCE based
architectures.
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Thank you!!
Questions?
This work was carried out with the support:
BONE NoE and the Spanish project: Multilayer networks
(TEC2008-02552-E).