optical packet switching the technology and its potential role in future communication networks

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1 [email protected] Zagreb 210503 Optical Packet Switching the technology and its potential role in future communication networks Results from IST project . Lars Dittmann COM – Technical University of Denmark [email protected]

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Optical Packet Switching the technology and its potential role in future communication networks. Results from IST project . Lars Dittmann COM – Technical University of Denmark [email protected]. What is the next generation photonic network? (different targets different timescales). - PowerPoint PPT Presentation

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Page 1: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Optical Packet Switching the technology and its potential role in

future communication networks

Results from IST project .Lars Dittmann

COM – Technical University of [email protected]

Page 2: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

What is the next generation photonic network?

(different targets different timescales)

• Extension to current SDH/SONET network with LCAS, ASON, GMPLS, GFP, etc. ?

• Bitrate and protocol transparent optical datapath with electrical control and management ?

• All-optical network with optical control, information processing and routing ?

Page 3: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Why do we need the next generation optical network ?

• for cost reduction reasons (cost reduction potential seems larger for optics than for electronics)

• to increase network efficiency and utilisation• for resource savings preserving network reliability and availability• for better network control for fast and efficient configuration of

connections (reduction of manual interventions)• to increase network flexibility and responsiveness to dynamic

traffic demands/changes• because an optical network is in line with a simplified core

structure with more complex and intelligent flow handling at the edges (which was the original idea of the MPLS concept)

Page 4: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Technological challengespossible optical connection types

Network Resources

Virtual ConnectionOriented

Connection-Less

BurstSwitching

PacketSwitching

Packet and Burst Switching

Virtual Leased Lines& VPNs

ConnectionOriented

Circuit Switching

Leased Lines

Page 5: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Technological challengespackets vs. circuits

Circuit

Flow

100ns

1ms

10ms

100ms

1ms

10ms

100ms

1s

100 1k 10k 0.1M 1M 10M 0.1G 1G

40 Gbps

Bitrate 2.

5 Gbps Burst

Packet

Tran

sfer

Tim

e

Transaction Size (Bytes)

10s

10 Gbps

Page 6: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Why packet switching

• Primarily a traffic engineering tool!• Seen as the final goal for network

flexibility, however must be justified • Packet based operation at application level

and transport level should not be mixed up!• Potential new methods for network

resilience in packet based networks (path set-up without resource reservation)

Page 7: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Optical Burst and label Switchingpotential step towards optical transport plane

Switch controlAdd/Drop control

Control plane interface

lcl1

ln

Out Fibrel0, l1,..., ln

WDM

Mux

1

lcl1

ln

In Fibrel0, l1,..., ln

WDM

Dem

ux 1

Burst Assembly/DisassemblyBuffering

Drop Ports Add Ports

IP Router

Switch Control(Label Swap)

O

E O

E

Labels in Labels out

O/E Conversion

Optical Domain

Electrical Domain

Data interfaces

OpticalSpace

Add/Drop Switch

Page 8: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

• DAVID = Data and Voice Integration over DWDM• A European research project

– Financially supported by the EU commission– IST program

• Goals– Develop concepts and technologies for future, optical networks– Traffic engineering in packet-over-WDM based networks– Control systems for optical networks

• Timeline– Start July 2000, end October 2003

Page 9: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

DAVID Project partners

• Companies– Alcatel, CIT (F)– Alcatel, SEL (D)

• Network operators– BT (UK)– TELENOR (N)– TELEFONICA (E)

• Research centers– IMEC (B)– COM (DK)

• Universities– NTUA (G)– University of Bologna (I)– Politechnica de Torino (I)– LRI (F)– INT (F)– University of Essex (UK)– UPC (E)

Page 10: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Overall architecture• Key components

– OPADM – optical packet add / drop multiplexer– Hub– Gateway– OPR – optical packet router

• Coverage– MAN and WAN

• Control– MPLS-based

MAN

WAN

Page 11: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Hierarchical MPLS concept• An MPLS based architecture for mixed-technology

networks• Traffic optimized/conditioned between levels• Levels of various granularity

Level Bandwidth granularity

Electrical MPLS Packets Optical MPLS Larger packets Wavelength routed

Wavelengths

+ wavelength bands, fibers

Page 12: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

The optical packet MAN• Topology - interconnected physical DWDM rings• Each physical ring -> several logical rings• Ring nodes – OPADMs - provide

– Ring connectivity– Legacy network interfaces

• Inter ring traffic controlled by a hub

Opticalswitch

RN1

RN 5MAC protocolMulti-ringsDwdmWavelength bandsOptical packetsOPADM &

legacy interfaces

Management of the flows

Wide Area Network

IP, Ethernet, ...

IP, Ethernet, ...

IP, Ethernet, ...

Legacy interface

Band demuxBand mux

Optical packet Add/Drop multiplexer (OPADM)

Hub

OPADM OPADM

data slot data slotdata slot

data slot data slotdata slot

data slot data slotdata slot

λ0

λ1

λν

...

Page 13: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

– permutations to use are based on measurements of "demand"

– each timeunit Hub switches traffic between rings– permutations to switch multislots between (logical) rings

The metro part: MAN• Hub functionality:

ring 1

ring 2

ring 3

ring 4

ring 1

ring 2

ring 3

ring 4

?ring 1ring 2ring 3ring 4

ring 1ring 2ring 3ring 4

1 2 3 1 3 32 3 4 3 2 13 4 1 2 1 24 1 2 4 4 4

...

...

...

...

ring permutation

slotin

put r

ing

?

Page 14: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Packet formats

For synchronisation reasons fixed size packets (at transport level) is preferable for small units (nano-micro sec).Variable service units handled by sequence of fixed size packets.

Page 15: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Ring node evolutionary steps (cost vs. flexibility)

DAVID MAN with active OPADMs

DAVID MAN with passive OPADMs

“Now” “Future”

Page 16: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Administrative challangesASON vs. GMPLS/MPlS

• Apply the dynamic configuration of service layers to the transport layer(s)

• Integrated control of layers in the network• Optimised use of the individual layers• Standard proposals from: IETF, ITU-T, OIF• Protocol centric solutions (IETF) vs.

architectural centric solutions (ITU-T)• Multi-layer resilience concepts

Page 17: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

Administrative challangesIETF : MPLS/MPlS

leve

l 0(M

AN)

leve

l 1(E

MPL

S)le

vel 2

(OM

PLS)

leve

l 3(M

PλS)

edgerouter

WAN

MAN

Technology hierarchy

Page 18: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

When will the next generation of photonic networks become a reality

• Significant effort needed to lower the cost and enable OAM functions of optical components (higher integration and automatic packaging)

• Better understanding of traffic and performance issues in core and metro networks needed to evaluate cost and reliability issues in current proposals.

• Gain consensus on administrative concepts and standard.• Optical networks must become digital – 3R in all elements

as first process

Page 19: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

When will the next generation of photonic networks become a reality

• Dynamic administration of pseudo optical networks (SONET/SDH) in 2-4 years.

• All-optical networks functions in the data plane obtainable in 5-10 years

• All-optical operation in all layers is not realistic with current know technology (and might never be)

Page 20: Optical Packet Switching the technology and its potential role in  future communication networks

[email protected] Zagreb 210503

IST DAVID info @ david.com.dtu.dk

Public demo in October in relation to Public demo in October in relation to

PS´2003 (photonics in switching) in ParisPS´2003 (photonics in switching) in Paris

and(NGPN deliverables @ www.ngni-core.net)