Converged Architecture for IP + Opticald2zmdbbm9feqrf.cloudfront.net/2012/eur/pdf/BRKSPG-2606.pdf · Converged Architecture for IP + Optical ... Packet Optical Transport Systems ...

BRKSPG-2606

Converged Architecture for IP + Optical

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© 2012 Cisco and/or its affiliates. All rights reserved. Cisco Public BRKSPG-2606 2

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Agenda

IP NGN Trends

Transport Evolution Trends

Packet Optical Transport Systems

Multi-layer Control Plane

Agenda


Revenue Split and Traffic Predictions

Packet

Circuit Packet

90+% IP Traffic

Private Line TDM/OTN

Traffic

Private/Public IP Traffic

2011

~30-50%

~50-70%*

2013 2016


Traffic


Traffic

20-30% 0─10%

Private/Public IP Traffic

Private/Public

IP Traffic

70-80% 90+%

Legacy TDM Traffic

• Massive change in SP traffic make-up in next 5 years*

• SP revenue shifting from circuits to packet services**

5 yrs ~80% revenue derived from packet services

• Packet traffic increasing at 34% CAGR***

Video (Walled Garden and OTT)

*ACG Research 2011, ** Cisco Research 2010, ***Cisco VNI 2011


Why L1 is Moving Towards Packet?

Market drivers:

Fast deployment of new packet applications and services in recent years

IP Video, Mobile data (smart phone apps)

Triple play, IP and Ethernet VPNs

Creates new revenue opportunities for service providers

Infrastructure drivers:

L1 moving to packet becomes inevitable

Replacing aging legacy networks, end of life devices

Consolidating networks onto common infrastructure

Flexible data rates and statistical Multiplexing for efficiency

Goal: Support growing new services with lower cost


POS / Ethernet / OTN Migration

POS and SDH R&D / Innovation caps 1995 / 2004

Ethernet has undergone continual innovation since standardization

OTN transitions in 2004/5 from SDH hierarchy to Ethernet payloads

1985 1990 1995 2000 2005 2010 2015

Ethernet

SONET / SDH

OTN

Standard FE GE 10GE 40/100GE

Standard

PoS

Standard

Eth Payload

Demand and

Innovation continue

OC3/12

OC48

OC192

OC3

OC12

OC48

OC192

OC768

SDH Payload

Demand and

Innovation continue OTU1/2 OTU3 OTU4

SPs are making transition from SDH / POS to Ethernet


Change in CAPEX Spending

A big % of the cost in NG network will be in optical interfaces

100G S&R CapEx shrinking

100G TCO 10-30% lower

than 40G, let alone 10G.

DWDM > 60% of CapEx;

Increasing IP+DWDM

savings opportunity

Cost/bit Reduction


Transport Evolution Layers

E-LAN E-Tree L3

svcs

MPLS/MPLS TP Digital

OTN

Private Line E-Line

E-Line SONET

/SDH

Emulated

L1

Agile DWDM Layer with OTN Digital Wrapper

Any Transport over DWDM


Past : General purpose line cards supporting core and edge applications

Core Applications : Small subset of features implemented

Edge Applications : Full feature set used

Box and card migration from core to edge

Core Routing : The Past

Edge

Core

Peering

And High Speed Edge P/PE

P


Lean Core: Definitions and Approaches

P/PE

P

Edge

Cards

Core Cards

Peering

Cards P/PE

P

Lean Core

Box

CARD BOX

Smaller tables sizes : smaller RIB & Maximum Label FIB (Information Base)

Reduced packet buffering

Simple queuing structures – 8 queues per interface

DWDM integration

MPLS forwarding(IP MPLS & MPLS-TP) and core QoS,


IP + Optical Building Blocks

Agile DWDM, Control Plane

Coherent technology

G-MPLS UNI-C interface

SRLG sharing, signalling

IPoDWDM Transponders

Black link standardisation

IETF SNMP MIB work

Optical OAM visibility

• Agile DWDM with WSON Control Plane

• G-MPLS UNI signaling between routers and DWDM

• Exchange of information and optimization from DWDM up to IP and IP

IP layer

Fast Convergence (Pre FEC FRR)


Agenda

IP NGN Trends



Multiplayer Control Plane

Agenda


Transport Layer Evolution

• High Tolerance to CD / PMD: MAL-less EDFA

• Coherent Receiver: No need to filter down to individual channel

Coherent Transmission to have deep impact on the Architecture and Design of DWDM Networks

• Growing Number of Degrees to 16 (or more…)

• Scale & Optimize Contentionless architecture

• Introduce FlexSpectrum

Increasing Number of Degrees / Flexibility of ROADM Nodes

• Support 96Chs 50GHz in C-band

• Scale per-wavelength Bit Rate

• High Power Co- and Counter-Propagating Raman units to support up to 70dB Spans

Extending Transport Capacity


DSP Evolution


10GE has migrated from low port count to high port count applications…

240

160

80

40

2002 2003 2004 2005 2006

Front Panel Density Gb/s

1x 300pin

4x XENPAK

16x XFP

24x SFP+

8x X2

2007

48x SFP+

480

Electrical I/O Lane Count x Rate Gb/s

16x0.6

4x3

1x10

10

16x X2

Chart & Images courtesy of Finisar


100G Reach & Density over time…

3200

1600

800

400

100

2010 2011 2012 2013 2014

Front Panel Density Gb/s

2015

Electrical I/O Lane Count x Rate Gb/s

10x10

4x25

4x CFP

CFP

8x CFP2

16x CFP4

32x CFP4 DD

Chart & Images courtesy of Finisar,

DD = Double Density, aka stacking


Interconnect Optics

Borrowing technology from the datacenter.

High Speed Computing – Infiniband

Active Optical Cables could implement a ―backplane‖ connection.

120G Interconnect In a Compact Footprint

Moving to 300G as ASICs and Trace Capacities Scale


Current 100G DWDM Examples

Modulation: Dual Polarized Quadrature Phase-Shift Keying (DP-

QPSK)

SW-configurable FEC algorithm to optimize Bandwidth vs. Reach:

• 7% based on Standard G.975 ReedSolomon FEC

• 20% based on Standard G.975.1 I.7 UFEC (1xE(-2) Pre-FEC BER)

• 7% based on 3rd Generation HG-FEC (4.6xE(-3) Pre-FEC BER)

Baud rate: 28 to 32 Gbaud

96channels Full C-band 50GHz tunable DWDM Trunk

CD Robustness up to 70,000ps/nm, PMD Robustness up to 30ps

(100ps of DGD)

Receiver Dynamic Range (Noise Limited): +0dBm to -18dBm


DP-QPSK 40G /100G Module Block diagram

iTLA

Integrated Receiver

90°

90°

2pol. Hybrid

Sta

tic E

qu

alis

er

Coherent Signal Processor

mC

Dyn

am

ic E

qu

alis

er

Ca

rrie

r/C

lk R

eco

ve

ry

De

co

de

r D

ata

In

terf

DP-QPSK Modulator

Pre

co

de

r

Mux/Precoder

Da

ta In

terf

acer

Pre

co

de

r

iTLA

Rx and Tx

Driver amplifiers

RX

TX

Two independent QPSK signals modulated on two orthogonal

polarization on the fiber (encoding of 2 + 2 bits/symbol or

4 bits/Htz which gives us 100Gb/s@25Gbaud.

DP-QPSK

X

Y


Beyond 100G: Higher-level Modulation Formats

Scattering diagram for CP-16QAM (4+4bit/symbol)

Scattering diagram for CP-64QAM (6+6bit/symbol)

X-pol Y-pol


Modulation Flexibility for Trade off Between Reach and Capacity


The Terabit Super-Channel

• Information distributed over a few Sub-Carriers spaced as closely as possible forming a 1,000Gbps Super-Channel

• Each Sub-Carrier transporting a lower Bit Rate, compatible with current ADCs and DSPs

-200 -150 -100 -50 0 50 100 150 200

f [GHz]

|Sch(f

)| 2

10x 100Gbit/s Sub-Carriers

close-to-Baud-rate spaced

fSuper-Channel #1 Super-Channel #2 Super-Channel #3


What is a Flex Spectrum ROADM?

1 - O

dd

1- E

ven

2 - O

dd

2 - E

ven

3 - O

dd

3 - E

ven

4 - O

dd

4 - E

ven

5 - O

dd

5 - E

ven

6 - O

dd

6 - E

ven

7 - O

dd

100 G

bp

s

400 G

bp

s

1 T

bp

s

100 G

bp

s

1 T

bp

s

100 G

bp

s

• Standard ROADM Nodes support wavelengths on

the 50GHz ITU-T Grid

Bit Rates or Modulation Formats not fitting on the ITU-T

grid cannot pass through the ROADM

• A Flex Spectrum ROADM removes ANY

restrictions from the Channels Spacing and

Modulation Format point of view

Possibility to mix very efficiently wavelengths with

different Bit Rates on the same system

Allows scalability to higher per-channel Bit Rates

Allows maximum flexibility in controlling non-linear

effects due to wavelengths interactions (XPM, FWM)

Allows support of Alien Multiplex Sections through the

DWDM System


Agile DWDM

Colorless

Today a tunable source is connected to a fixed port in a DWDM system

Colorless does away with the fixed port and allows the port to change based on source

Omni-Directional

Today you direct connect a source into the DWDM system based on the direction you want to transit, any changes requires manual intervention

Omni- Directional does away with a fixed direction and direction changes via SW

Flex-Spectrum

Today you purchase a 50GHz or 100GHz etc.. Gridded DWDM system forcing performance trade offs and limiting future growth

Flex-Spectrum does away with the notion of fixed spectrum spacing allowing the DWDM port to adjust to the source.

Contentionless

Capability to remove any lambda contention in the ADD/Drop side of the ROADM


ROADM Trend

ROADM

RX TX RX TX

Tunable Laser – Transmit

laser can be provisioned to any

frequency in the C-Band.

Colorless – ROADM add ports

provisioned in software and

rejects any other wavelengths.

Tunable Receiver – Coherent

Detection accepts provisioned

wavelength and rejects all others.

Omni-Directional –

Wavelength can be routed from

any Add/Drop port to any

direction in software.

Contention-less – In the same

Add/Drop device you can add

and drop the same frequency to

multiple ports.

Flex Spectrum – Ability to

provision the amount of

spectrum allocated to each

Wavelength allowing for 400G

and 1T bandwidths.


EDRA: Erbium Doped Raman Amplifier

• Integrating Raman and EDFA in a single card has already proven to be an effective solution to allow optimal balance between Distributed (Raman) and Concentrated (EDFA) amplification

• The goal is to provide a completely integrated Optical Amplifier solution which can include everything needed to face a single direction of the fiber:

Counter-Propagating Raman – Features variable power allowing to control

the overall amount of Raman amplification for the specific Site Degree

Low-Noise Pre-Amplifier – True Variable Gain EDFA optimized to operated

with the Counter-Propagating Raman

• Support for up to 96chs (50GHz spacing)


EDRA vs. EDFA: Noise Figure

• At least 6dB of Noise Figure improvement provided by EDRA vs. EDFA with similar Gain & Power Range

FAIL

ACT

SF

OP

T-E

DR

Axx-C

MO

N

RX

1345987

MO

N-L

TX

RX

TX

RX

TX

RX

TX

CO

M

OS

C

LIN

E-T

X

LIN

E-R

X


Why IPoDWDM (basic reasons)

• 66% reduction in number of optical Interfaces

Reduced Cost

Improved reliability

• 50% reduction in the number of patch cables

Less operational issues at turn up

• Reduction in common equipment

Less racks / shelves / common cards

Less Real Estate

Less COLO fees

• Fewer fans

Improved reliability

• Less Power

Reduced Power costs

No new Power plant requirements

• G.709 terminates on router

L1 awareness

Enhanced troubleshooting features

Enhanced protection features


Proactive Protection: High Level Concept

Trans-ponder

SR port on

router WDM

port on router

Optical impairments

Co

rre

cte

d b

its

FEC limit

Working path

Switchover lost data

Protected path

BE

R

LOF

Optical impairments

Co

rre

cte

d b

its

FEC limit

Protection trigger

Working path Protect path

BE

R

Near-hitless switch

WDM WDM

FEC

FEC

Today’s protection Proactive protection


IPoDWDM Supports 2 network management models

1. Segmented Management:

• Retain existing operational model for certain SPs

• Respect boundaries between data/optical groups

2. Integrated management:

End to end provisioning

Better trouble shooting

1 mgmt system, 1 DB

Unified look & feel

Lower OPEX


Agenda

IP NGN Trends




Agenda


More than the sum of it’s parts!!

Leverage TDM Grooming

Leverage Statistical Multiplexing

Eliminate Inter-Layer Ties

Single Fabric to Manage

Line Cards Can Carry Multiple Purposes

Low Barrier to Deployment

No Crystal Ball Necessary

Pure OTN Transport or

Pure Muxponder

Lambda 1 Lambda 2

Agg Router

IPoDWDM Muxponder

Lambda 1 Lambda 2 Lambda 1 Lambda 2

Deferred

OOTN/Packet

Hybrid

- Source: Infonetics

T

P

T

P

T

P

$$$

Saved


Packet Optical Transport

• Packet transport : packet with a transport characteristics

• Transport characteristics : OAM, Point and click management, protection etc

• Integration with other transport components

DWDM, SONET/SDH, OTN, MPLS-TP

Basic L2 functionality (MPLS-TP)

Agile ROADM

Packet Optical Transport

Integrated packet and optical

management


MPLS Options

Industry Direction

Core

Edge & Aggregation

Static Hybrid

(Static/Dynamic)

Dynamic

Forwarding Plane MPLS Label MPLS Label MPLS Label

Control Plane Manual NMS

Dynamic NMS

Access/Agg – Manual NMS Agg/Core – Dynamic IP

Dynamic IP

Protection Manual or

NMS Calc and

provisioning

Dynamic—core Manual—Agg/Acc

Auto-calculation or explicit route

OAM MPLS-OAM MPLS-OAM MPLS-OAM


TDM Transport Packet Data Network

Connection mode Connection oriented Connectionless (except TE)

OAM In-band OAM Out-of-band (except PW, TE)

Protection Switching Data Plane Switching Control plane dependency

BW efficiency Fixed Bandwidth Statistical multiplexing

Data Rate Granularity Rigid SONET hierarchy Flexible data rate

QoS One class only QoS treatment

Cherry Picking


36

1: [RFC 5317]: Joint Working Team (JWT) Report on MPLS Architectural Considerations for a Transport Profile,

Feb. 2009.

Definition of MPLS “Transport Profile” (MPLS-TP) protocols,

based on ITU-T requirements

Note: IETF decided to support single MPLS-TP OAM solution.

IETF Chair stated at IETF 79 (11/2010) and IETF 80 (3/2011)

Derive packet transport requirements

Integration of IETF MPLS-TP definition into transport network

recommendations

IETF and ITU-T agreed to work together and bring transport requirements into the IETF and extend IETF MPLS forwarding, OAM, survivability, network management, and control plane protocols to meet those requirements through the IETF Standards Process.[RFC5317]1

ITU-T withdrawal of T-MPLS draft G.8114 in Jan. 2008.

IETF and ITU-T Joint Work on MPLS-TP

http://www.itu.int/


MPLS-TP OAM Standards Status Core protocols are under WG last calls to become RFCs

IETF Chair Russ Housley stated at IETF 79 and IETF 80 meetings: IETF only supports single OAM solution for MPLS-TP

ITU-T determined in Feb. 2011 for G.8113.1 to enter Traditional Approval Process, contingent on IETF Code Point assignment; and continue work with IETF to standardize MPLS based MPLS-TP OAM.

• Standardizing by IETF and ITU-T • Pending to approval in ITU-T

• Contingent on IETF Code Point assignment

• Not supported by IETF

ITU-T Support

IETF Support

IETF: MPLS

based TP OAM

ITU-T: G.8113.2

ITU-T:

G.8113.1

Light Reading Webinar June 17, 2011

http://www.itu.int/


38

Working LSP

PE PE

Protect LSP

NMS for Network Management

or Control Plane

Client node Client node

MPLS-TP LSP (Static or Dynamic)

Pseudowire

Client Signal

with e2e and

segment OAM Section Section

Connection Oriented, pre-determined working path and protect path

Transport Tunnel 1:1 protection, switching triggered by in-band OAM,

Option with NMS for static provisioning

MPLS-TP Concept


MPLS Label

Switched Path

(LSP)

Pseudowire

Encap DS1 Service

E1 Service

MPLS-TP

Generic Associated Channel (G-Ach)

for Inband MPLS-TP OAM

Pseudowire Muxing

Function

Circuit Emulation

1588v2

MPLS-TP

MPLS-TE

over

DWDM

Network Identifier

MPLS Label

MPLS Label

Switched Path

(LSP)

PW

E3 E

nca

p

Ethernet

Service

80

2.1

Q, .1

ad

EV

C

G-Ach G-Ach

STS-1/Nc

SPE

VC-3/4 SPE

VT1.5 SPE

VC-11/12 DS1 Service

E1 Service

STS-1/Nc

SPE

VC-3/4 SPE

80

2.1

Q

80

2.1

ad

Ethernet

Service

SONET/SDH

VT1.5 Muxed

Into STS-1

Ethernet Mapping

Network Identifier

STS/VC number

SONET

SDH

over

DWDM G

FP

-F/ H

DL

C

MPLS-TP Encapsulation

VT1.5 approximately

Equivalent to Pseudowire

STS-N/VC-3/4 approximates

an LSP


MPLS-TP vs SONET/SDH

MPLS-TP

MPLS

-TP

over

DWDM

MPLS Label

Switched Path

(LSP)

PW

E3 E

nca

p

Ethernet

Service

80

2.1

Q, .1

ad

EV

C

G-Ach

STS-1/Nc

SPE

VC-3/4 SPE

80

2.1

Q

80

2.1

ad

Ethernet

Service

SONET/SDH

Ethernet Mapping

SONET

SDH

over

DWDM

GF

P-F

/ HD

LC

STS-1

VC-3

STS-1

VC-3

STS-1

VC-3

STS-1

VC-3

1 2 3 192

OC-192

STM-64

192 STS-1/VC-3 @ 51 Mbps

Fixed SPE

Capped at 10 Gig

LSP LSP LSP LSP

1 2 3 192

10 GigE

192 LSP’s @ 51 Mbps CIR

Bandwidth Efficient

Service Scalability & Flexibility

Statistical Multiplexing Service Granularity (PW) @ 1 Mbps


Characteristic SONET

SDH

Optical OTN

(ROADM)

Electrical OTN

PBB-TE MPLS-TP IP/MPLS

Ethernet

Eline (10GE)

Eline (GE)

Eline (any gran. Sub GE/10GE)

E-Tree Complex

E-LAN Complex

Legacy

F/R

ATM

TDM

IP

L3VPN

L3 Unicast

L3 Multicast

Content

General

Traffic Engineering

50ms restoration

Multiplexing Technology Time Division

Wave Division Time Division Statistical Statistical Statistical

UNI processing Limited None None Typically rich Typically rich Typically rich

Granularity VC-4 Lambda ODU Variable Variable Variable

Technology Maturity MPLS w/ OAM & 50ms Protection

MPLS-TP Transport P-OTS Transition

Metro EoS to MPLS-TP


When to consider MPLS-TP?

Most common use case: replacing SONET/SDH with MPLS-TP

Typical applications:

Metro aggregation/access

Mobile back-haul

Which MPLS-TP Model?

Depending on the operational model and long term planning

Dynamic with GMPLS control plane is preferred if ops model allows

Static provisioning model may provide easy adaption for the transport ops –

most commonly adopted practice today

Can MPLS-TP be used to replace IP/MPLS?

No. MPLS-TP is MPLS focused on transport-only features, it does not

provide L2/L3 services functions as IP/MPLS does

Design Considerations – when to use MPLS-TP?


IP + Optical System Architetcure

Single OS

Purpose built Functionality

Purpose built Fabric

And Purpose built ASICs

Core

Fabric

ASIC

Core / Edge / transport ASIC

Routing / Transport OS

Routing Apps / Sys. Admin

Core Edge Transport

Core

ASIC

EDGE

ASIC

Transport

ASIC

Common ASIC

Common Fabric

Admin Plane Virtualization

Routin

g

XR

Ad

min

Pla

ne

Pro

xim

ity

Vid

eo

OT

N

Tra

nsp

ort

Agnostic Fabric

Common ASIC

Leverage Virtualization

Virtualize Services / OSs


Functions as Line cards, not Boxes

Common Software

Application Building Blocks

IP/M

PL

S

MP

LS

-TP

IPo

DW

DM

OT

N S

w

MP

LS

-TP

Infrastructure Building Blocks

DW

DM

IP/M

PL

S

Lean C

ore

Peerin

g

Peerin

g

Dyn

am

ic-T

P

CT

M A

cce

ss

Common Agnostic Fabric

Common ASICs

Common Optics

Transport Shelf Core Router Shelf


Agenda

IP NGN Trends




Agenda


Network architecture

IPoDWDM/

MPLS-TP DC/SAN

SONET

SDH

DSLAM /

Wireless

backhaul

Any Transport over DWDM

Control

Control Control

Control

Control

Control

UNI-N UNI-N UNI-N

UNI-N

UNI-N

UNI-N

UNI-N UNI-N

WSON WSON

GMPLS UNI

E-NNI


Control plane multi-layer interaction

• WSON = Wavelength switched optical network

• ASON = Automatically Switched optical network

• ASMN = Automatically switched MPLS-TP network

OTN / TDM

NG-ASON

IP / MPLS

S-GMPLS

MPLS-TP

ASMN

DWDM

Wavelength

on demand

Optical

restoration

(1+R,

1+1+R) ASMN / WSON

border

L3 / S-GMPLS

WSON border

ASON / WSON

border

Legacy Traffic

Wholesale

IP Core

Carrier

Ethernet

NGN

WSON

Cli

en

t In

terf

ac

e r

eg

istr

ati

on


WSON in the Standards Bodies (Wavelength Switched Optical Networks)

Charter: Global Telecom Architecture and Standards Member Organizations: • Global Service Providers

• PTTs, ILECs, IXCs

• Telecom equipment vendors

• Governments

•---ASON, impairment parameters G.680

Charter: Evolution of the Internet (IP) Architecture (MPLS, MPLS-TP)

Active Participants:

• Service Providers

• Vendors

--WSON,

WSON Optical Impairment Unaware

https://datatracker.ietf.org/doc/draft-ietf-ccamp-rwa-wson-framework/

WSON Optical Impairment Aware Work Group Document

http://www.ietf.org/id/draft-ietf-ccamp-wson-impairments-06.txt
























Why Do We Need WSON ?

WSON is an Impairment aware DWDM control plane (ASON is not)

Client interface registration Alien wavelength (open network)

Transponder (closed network)

ITU-T interfaces

Wavelength on demand Bandwidth addition between existing S & D Nes (CLI)

Optical restoration-NOT protection Automatic Network failure reaction

Multiple SLA options (Bronze 0+1, Super Bronze 0+1+R, Platinum 1+1, Super Platinum 1+1+R)


What WSON Does not do for you

WSON is a restoration mechanism rather than a protection mechanism.

Optical Protection guarantees < 50 msec protection & IPo DWDM guarantees < 15 msec protection. Since WSON is a restoration mechanism it does not guarantee sub 50 msec restoration.

Network Planner should plan both protection and restoration together example 1+0+R or 1+1+R.

Resolve congested links in the event of fiber cut scenarios.


Agile DWDM Layer

ROADM

RX TX RX TX

X

Tunable Laser – Transmit

laser can be provisioned to any

frequency in the C-Band.

Colorless – ROADM add ports

provisioned in software and

rejects any other wavelengths.

Tunable Receiver – Coherent

Detection accepts provisioned

wavelength and rejects all others.

Omni-Directional –

Wavelength can be routed from

any Add/Drop port to any

direction in software.

Contention-less – In the same

Add/Drop device you can add

and drop the same frequency to

multiple ports.

Flex Spectrum – Ability to

provision the amount of

spectrum allocated to each

Wavelength allowing for 400G

and 1T bandwidths.

Restoration – Ability to reroute

a dangling resource to another

path after protection switch.

Key Values

- Complete Control in Software

- No Manual Movement of Fibers

- Increased Service Velocity

- Control Plane Can Automate

Provisioning, Restoration, Network

Migration, Maintenance

Foundation for IP+Optical!!


WSON Foundations

WSON Building Blocks Tunability

• Optical channels can be moved and changed to different wavelengths completely via software

Colorless

• Ability to change the wavelength aspects of these devices without moving any physical fibers

Omni-Directional

• A fixed fiber port interface directed to any of the degrees within the ROADM node

Impairment-aware

• DWDM system must be able to measure optical impairments

Zero Touch End to End Solution


Linear impairments

Power Loss

Chromatic Dispersion (CD)

Polarization Mode Dispersion (PMD)

Optical Signal to Noise Ratio (OSNR)

Non linear Optical impairments:

Self-Phase Modulation (SPM)

Cross-Phase Modulation (XPM)

Four-Wave Mixing (FWM)

WSON Should Consider all Necessary Effects

WSON input based on G.680


L0 SRLGs

Latency

Path

Circuit ID

Performance

Topology / Feasibility Matrix

What?

Lowest Optical Cost

Link Bundles

Coordinated Maintenance

Avoid L0 Risk

Optical Restoration

Low Latency or specify latency

Multi-Layer Optimization

Why?


Convergence Control Plane - iOverlay

iOverlay can provide the network knowledge of peering while providing greater scale

Provide Multi Layer Support while Respecting Organizational Boundaries

Leverage Expertise across layers

Share and leverage information across layers

Router

MPLS-TP switch

OTN XCONN

Etc..

Router

MPLS-TP switch

OTN XCONN

Etc.. DWDM DWDM

iOverlay - UNI iOverlay - UNI


The Interaction - Restoration

Restoration – L3 Protect -> L0 Restores

Today:

Protection is provided via L0 Team

1+1, Fiber protection, etc…

Does not efficiently utilize available BW

Increases Cost per Bit

Protection is provided via L3 team

Decrease Interface Utilization based on WC BW

Does not efficiently Utilize BW

Increase Cost per Bit

iOverlay:

L3 detects Circuit degradation and initiates Proactive Protection

L0 Restores capacity back to network and signals existing router port to change if needed

New SRLG data is propagated and recorded

Packet Layer

Optical Layer

S1 X

X

10

11

00

1


Summary

ROADM

RX TX RX TX

Upper Layer Protection– Bend but do not Break! Protect

traffic before failure allowing near

zero packet loss

Shared Risk Link Groups–

End to End circuit provisioning

with knowledge of any Optical

infrastructure risks.

Coordinated Maintenance–

Provide proactive notification of

maintenance activity to

connected NEs to proactively

route around maintenance node

Multi Layer Provisioning–

Leverage CP to allow upper

layers to request circuit source

and destination with constraints

BW Restoration– Leverage

proactive protection to protect

circuit then leverage CP to

restore BW to network utilizing

same interface.

G.709 /

FEC

G.709 /

FEC

Routing

Engine

Routing

Engine

G.7

09

/ F

EC

G.7

09

/ F

EC

X FEC Cliff

FEC thres.

1 2

4 1

5

UNI-C

Diversity / SRLG

ROADM X Provide L1 visibility to L3–

L3 can react to changes in L1

3 4

FEC Cliff

FEC thres.


Oakland

Fremont

Pleasanton

San Francisco

Burlingame

Hayward

Santa Rosa

Fairfield

A

B

C D

A B

C

D

San Jose

Palo Alto

Berkeley

TDM XC

DWDM Layer

100G with ASON/OTN Restoration

•XC at Each Site (ex 10X100G Links)

•No Pass through. All Add drop

•Large XC Capacity

•ASON does not have OI Awareness


Oakland

Fremont

Pleasanton

San Francisco

Burlingame

Hayward

Santa Rosa

Fairfield

A

B

C D

A B

C

D

WSON Restoration Example for AToDWDM

•OI Aware DWDM Control Plane

•Switch when you can & regenerate when

you must (Lambda Switching)

•Minimize TDM XC/OEO

•Minimize Latency and cost


Bandwidth on demand

At a certain time bandwidth required between A and B exceeds the available one

The router A has 4xNGB connection to B. It asks for N+1

2xl

2xl

A B


Bandwidth on demand

Using GMPLS-UNI, the control plane allocates a new lambda between the 2 sites

over an existing path should you have the proper Agile DWDM infrastructure in place.

3xl

2xl

A B

GMPLS UNI


Bandwidth on demand

Or The control plane allocates a new lambda between the 2 sites over a new

path

2xl

2xl

A B

1xl


Rapid service setup

Transponder spare cabled at A and B

Client to ODF

Trunk to Color Less / Omni directional DWDM system

A

B

ODF Customer

interface

ODF

Cu

sto

mer

inte

rface


Rapid service setup

WSON Control plane find a valid path A to B and set up the wavelength

A

B

ODF Customer

interface

ODF

Cu

sto

mer

inte

rface


Rapid service setup

WSON Control plane color the Transponder trunk to match the wavelength

The connection is up! The customer can use it

A

B

ODF Customer

interface

ODF

Cu

sto

mer

inte

rface


Rapid service setup

The SP re-stock the spare Transponders at both site A and B

A

B

ODF Customer

interface

ODF

Cu

sto

mer

inte

rface


0+1+R

Unprotected Lambda Group

2xl A

B


0+1+R

Failure detected and propagated thru G.798 network level alarm correlation

2xl A

B

X


0+1+R

Lambda group rolled to a new path. Re-colouring possible

2xl

2xl

A B

X


0+1+R

Freeing up old path

2xl

A B

X


1+1+R

1+1 Lambda protection method (e.g. Y-Cable, mesh lambda protection)

2xl

2xl

A B

1+1


1+1+R

Failure happens

2xl

2xl

A B

1+1

X


1+1+R

Create new 2x Lambda connection using different path

Free up resources of the old one

2xl

2xl

A B

1+1

X


MPLS-TP over 10G WDM Ring

Upto 100G IPoDWDM

Muti-Service Edge

Aggregation Node

Core router

Access Node

MPLS-TP Access Ring

Dynamic MPLS Core

with IPoDWDM/WSON

Static MPLS-TP

Agg. & Access

City Y

MPLS-TP Metro

City Z

MPLS-TP Metro

City X

MPLS-TP Metro

End to End POTS Architecture


IP + Optical Integration Summary

Agile DWDM, Control Plane

100G Coherent technology

G-MPLS UNI-C interface

SRLG sharing, signalling

IPoDWDM Transponders

Black link standardisation

IETF SNMP MIB work

Optical OAM visibility

• Agile DWDM with G-MPLS Control Plane

• G-MPLS UNI between routers and DWDM

• Exchange of information and optimization between optical and IP

IP layer

Fast Convergence technology


Glossary

ASON Automatically Switched Optical Network

AToDWDM Any Transport over DWDM

CCAMP Common Control and Measurement Plane

DCU Dispersion Compensation Unit

EFEC Enhanced Forward error Correction

GMPLS Generalized Multiprotocol Label Switching

IPoDWDM IP over DWDM

ITU Q6/SG 15 ITU Question 6 Study Group 15

MPLS-TP Multi Protocol Label Swicthing - Transport Porfile

NE Network Element

OAMP Operation Administration Maintenance and Porvisioning

OTN Optical Transport Network

RFC Request for Comments

UNI User Network Interface

WSON Wavelength Switched Optical Networks

WXC Wavelength Cross Connect


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Converged Architecture for IP + Opticald2zmdbbm9feqrf.cloudfront.net/2012/eur/pdf/BRKSPG-2606.pdf · Converged Architecture for IP + Optical ... Packet Optical Transport Systems ...

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