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

2

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

3

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?

4

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

5

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

6

Control plane: Interconnection models

Separated ModelIntegrated Model

7

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

8

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

9

Multi-layer Traffic Engineering

Mechanisms

......

ROADM

IP Router

DWDM

Transponders

Router

Traffic

Pass-through

Traffic

LSPs electronically

routed

LSPs optically routed

LSPs grooming

10

Architectural solutions

IP Node

Optical

Node

Multi-layer

Node

11

Definition of MTE engineering

mechanismsDemands

Routing

algorithm

Find

possible

bypasses

1

2

Longest

firstLargest

first

6

3

45

12

Definition of MTE engineering

mechanisms

10 Gbps

6 Gbps

6 Gbps

4 Gbps

10 Gbps

6 Gbps

Longest

first

Largest

first

2 63 5

13

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

14

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

16

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

17

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.

18

Thank you!!

Questions?

This work was carried out with the support:

BONE NoE and the Spanish project: Multilayer networks

(TEC2008-02552-E).