Optical Service Chaining by Combining Optics, SDN, and minimum …groups.geni.net/geni/raw-attachment/wiki/GEC20Agenda... · 2014-07-10 · Slide title minimum 48 pt Slide subtitle

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Optical Service Chaining by Combining Optics, SDN, and NFV

Ming xia Ericsson research, u.S.A. Workshop on software defined optical networking Geni conference 2014, davis, ca


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Optical Service Chaining | GENI Conference 2014 | © Ericsson AB 2014 | 2014-06-21 | Page 2

Network Function Virtualization › Network Function Virtualization

– Middlebox services or network functions are realized in software running on generic hardware and in virtualized environments.

– Motivated by CAPEX savings and faster time to market of new offerings and solutions.

Source: ETSI NFV Whitepaper 2012

Benefit

l CapEx/OpEx saving

l Shorter development cycles for new services

l Automation of NF configuration and management

l Support multi-tenancy of NF

l …


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End-To-End Path of Traffic Flow

Internet Operator's DC/Cloud with

virtualized network functions Operator's Access Network with Legacy NFs (e.g. middleboxes)

NF

NF

NF

Aggregation Router P-GW/

BNG

VNF

VNF VNF

Storage Switch Server


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Challenge in Data Center Networks •  Steering traffic across core network functions in data

centers requires high efficiency and scalability –  How to efficiently handle ~10s of Gbps traffic steering? –  How to dynamically shape network infrastructure to support bulky

traffic transmission?

•  Data center network infrastructure and cloud manager needs to be interacted to optimizing networking and server resources

Source: A Scalable, Commodity Data Center Network Architecture


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Scalability Issue – An Example f1 and f2 are 5 Gbps flows

f1 needs to go through vNF1 and vNF2

f2 needs to go through vNF3 and vNF4

f1: S1-ToR1-vNF1-ToR1-S1-ToR2-vNF2-ToR2-S1

f2: S1-ToR3-vNF3-ToR3-S1-ToR4-vNF4-ToR4-S1

Core switch has a capacity of 40Gbps

vNF1 vNF2 vNF4 vNF3

f1 and f2

s1

ToR1 ToR2 ToR3 ToR4

Packet Steering Domain

ToR5 ToR6

f1 and f2 are 10 Gbps flows

f1 needs to go through vNF1, vNF2, and vNF3

f2 needs to go through vNF4, vNF5, and vNF6

f1: S1-ToR1-vNF1-ToR1-S2-ToR2-vNF2-ToR2-S2-ToR3-vNF3-ToR3-S1

f2: S1-ToR4-vNF4-ToR4-S2-ToR5-vNF5-ToR5-S2-ToR6-vNF6-ToR6-S1

Core switch has a capacity of 40Gbps

vNF1 vNF2 vNF4 vNF3

f1 and f2

s1

ToR1 ToR2 ToR3 ToR4

Packet Steering Domain

vNF5

ToR5

vNF6

ToR6

s2


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Motivation of Using Optics

› The throughput of the packet steering domain increases as traffic volume grows.

› Power consumption goes up correspondingly as throughput.

A new scheme is needed: l Insensitivity to traffic growth and number of virtual network functions

l High power efficiency


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Overall Architecture

vNF vNF

OSS/BSS System

SDN Controller Cloud Management System

Internet

Operator's DC/Cloud Operator's Legacy Access Network Legacy NFs (e.g. middleboxes)

Traffic leaves aggregation domain

TOR

Optical steering domain TOR TOR TOR

vNF vNF vNF

Pkt steering domain Aggregation

Router

ROADM

Core Switch (DC-GW)

P-GW/

BNG

vNF vNF

vNF

TOR

•  Introducing an optical steering domain

•  ROADM dispatches traffic to the two domains

•  Optical domain is complement to packet domain

ROADM: Reconfigurable add/drop module

Flow path


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Optical Steering Domain

P1

P2

P3

P4

P5

P1

P2

P3

P4

P5

P1

P2

P3

P4

P5

Tunable transceiver

WDM link

Link with any single wavelength

Optical coupler

WSS 1

WSS 2 WSS 3

In

Out ToR1

vNF1

ToR2

vNF2

ToR3

vNF3

ToR4

vNF4

Optical steering domain

Architecture for traffic steering for NFV using optical technology.

vNF vNF

Operator's DC/Cloud

TOR

Optical steering domain TOR TOR TOR

vNF vNF vNF

Pkt switching domain

TOR


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Performance Analysis-Setting

Scenario Flow rate (Gbps) # of needed vNFs per flow

1 10 1 2 10 2 3 40 2 4 40 3 5 100 3 6 100 4

Core switch ToR switch Optics 10GbE 3.91 1.3 / 40GbE 15.625 5.21 / 100GbE 46.875 15.63 / WSS per port / / 2.0

Table 1 Scenarios for scalability analysis (2 flows).

Table 2 Power consumption at different flow rates (W)*.

*Source: Ericsson DCX series for core and ToR Switch)


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Performance Analysis-Result

1 2 3 4 5 60

200

400

600

800

1000

1200

Core

switch packet th

roughput (G

bps)

S c enario

P a cket switching S O L uT IoN

1 2 3 4 5 60

100

200

300

400

500

600

700

800

Power

Consu

mption (W

)

S c enario

P a cket switching S O L uT IoN

Total packet throughput by core switches. Power consumption for the six scenarios.


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Summary

We propose a circuit based (optical-layer) solution for efficient traffic steering to support network function virtualization (NFV). • Based on software-defined networking (SDN) principles • High scalability and power efficiency for bulky traffic steering • Complement to existing packet-based solutions


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Optical Service Chaining by Combining Optics, SDN, and minimum …groups.geni.net/geni/raw-attachment/wiki/GEC20Agenda... · 2014-07-10 · Slide title minimum 48 pt Slide subtitle

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