key network architecture enablers for wavelength-on-demand and l1vpn services chris liou, infinera...

Key Network Architecture Enablers for Wavelength-on-Demand and L1VPN Services

Chris Liou, InfineraVijay Vusirikala, Infinera

Infinera Confidential and Proprietary | 2

Outline

Dynamic Wavelength-On-Demand Services & Layer1 VPN Applications

Key Application Requirements

Architectural Considerations

A Digital Optical Networking Approach


Outline






What is a L1VPN?

A Layer 1 network abstraction that presents a secure, dedicated transport network to the end customer An alternative to a dedicated physical Layer1 network May co-exist with other L1VPN instances on the same physical

carrier network

Provides end-customer with control & visibility over Layer 1 services between Customer Edges (CEs) Comprised of a set of CEs & the VPN connections provided by the

provider (between Provider Edges (PEs)) Varied levels of network management control & visibility

Standards efforts in progress (IETF, ITU-T) GMPLS playing a key role in signaling & routing E.g., draft-ietf-l1vpn-*, ITU-T SG13


L1VPN Example

Multiple dynamically reconfigurable L1VPNs can co-exist on single carrier network

Enables secure, self-configurable & viewable sub-network Streamlines customization of dedicated customer virtual

network

1

1

1

22

CNMSystem

CNMSystem

Customer 1 Customer 2

GMPLS


L1VPN & Dynamic WoD Drivers

Basis for new service offerings for wholesale carriers An alternative to leased point-to-point waves Rapid reconfigurability of L1 services with minimal carrier intervention Shifts onus of capacity planning away from carrier and into customer’s own

hands

Facilitates internal carrier partitioning of common L1 network Streamline carrier’s servicing of internal capacity requests E.g., wholesale carrier providing IP organization with self-configurable L1

transport VPN

Dynamic real-time reconfigurability enables many applications Dynamic load-sharing based on capacity-on-demand One-time high bandwidth broadcast events Timesharing of network capacity Short-term capacity lease


Outline






Key Elements of L1 VPNs

Data Plane • Scalable transport & bandwidth management• Multi-service support• Protection and restoration

Control Plane - GMPLS/ASON• Topology discovery• Route computation• Service provisioning and restoration

Management Plane • End-to-end VPN visualization (CNM) & administration• FCAPS• Network planning


Key Elements of L1VPNsData Plane Considerations

Service transparency Zero modifications to wave service

Flexible service mix/options for customer Multi-rate, multi-protocol

Flexible delivery options for carrier Efficient network & resource utilization Future-proof for future higher-speed services (40G, 100GE)

Any-to-any capacity delivery Carrier-controlled restrictions on data path Customer options for path diversity

Security Misconnection detection & avoidance Isolation between multiple L1VPNs

Data path protection & restoration Options for protection from network failures Layer 1 preemption capability


Key Elements of L1VPNsControl Plane Considerations

On-demand “touchless” reconfigurability Intelligent control plane for streamlined, automated

routing & provisioning Minimal OpEx & lead-times

Evolution path towards dynamic UNI signaling (CE-PE)

Secure & isolated control plane functions Zero interaction between multiple VPNs

Data & Control Plane separation Data plane unaffected by control plane failures

Customer traffic engineering options for route diversity


Key Elements of L1VPNsManagement Plane Considerations

Customer Network Management (CNM) Customer-specific management views of topology, capacity, traffic,

services Automated synchronization with VPN topology

Carrier management of L1VPNs Bi-directional APIs for advanced service management applications

E.g., policy control Ease of administration

L1VPN configuration management Reconfigurability for future L1VPN needs (e.g., higher capacity

between sites) Appropriate hooks for policy management integration

Ease of troubleshooting


L1VPN Abstraction

Car

rier

Net

wor

kC

usto

mer

Net

wor

k

Carrier EMS/NMS

Customer Network Management view

20G

20

G

30G

40G

30

G

CNM view provides L1VPN abstraction Dedicated capacity provisioned

between customer sites End-to-end abstraction excludes

intermediate NE’s

Benefits of L1 VPN control without deploying full WDM network Customer nodal sites dynamically

manage bandwidth Leverage carrier field operations

Varying degrees of data & control plane isolation Overlay vs shared GMPLS model Dedicated vs shared switching


Outline






L1VPN Service Model OptionsDiscussion

Pre-established vs. On-demand PE-PE capacity PE-PE cross-sectional capacity needs may evolve over

time On-demand link sizing encourages sharing of capacity

across multiple customers

Shared vs. dedicated per-VPN switching L1 switching function for each VPN can reside “on” or

“off-net” Off-net switching creates natural security partition


L1VPN Service Model Options (contd.)Discussion

Management vs. Signaling based provisioning Specifies how dynamic circuit configuration is accomplished Signaling based model generally more broadly discussed

Overlay vs. Peering signaling model (CE-PE) Signaling only vs. Signaling + Routing model (aka, Basic vs

Enhanced Mode– Routing enables automated membership & TE link information

exchange

Virtual Node vs. Virtual Link model Differing abstraction levels of L1VPN capacity Virtual Link is currently finding favor


L1VPN Service Level Requirements Discussion

Accounting Reporting Security of provider-customer communication

Data-, control-, and management planes Data integrity, confidentiality, authentication, and

access control

Class of Service (e.g., Availability Class) Performance Reporting Fault Reporting Connectivity Reporting Policy (e.g., path computation policy, CE-CE

signaling pass-through, etc.)


Optical Architecture Options for L1VPNs

ODXC

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Local Add/Drop

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Local Add/Drop

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ROADM/WSS Digital Optical Networking

Optical Digital Cross-Connect (ODXC)

Integrated switching + WDM

Digital sub- ODUk switch

Add/drop, switch, groom 100% of line capacity

Client optics only for local add/drop

All-optical wavelength switching

No wavelength conversion

No sub- switch, mux and grooming without separate OEO

Transponders only for local add/drop

Separate switching + WDM

Digital sub- switch: ODUk or STS-1/VC-4

OEO conversion of 100% of WDM traffic

Add/drop, switch, groom 100% of line capacity

Local Add/Drop


Outline






Digital Optical NetworkingFull Reconfigurability at Every Node

Use (analog) photonics for what it does best: WDM transmission

Use (digital) electronics for everything else

Digital add/drop, switching, grooming, PM and protection…

…at every node

Unconstrained digital add/drop

Any service at any node

End-end service delivery independent of physical path

Robust digital PM and protection

Digital OAMP & managementIntegrated P

hotonics

Integrated Photonics

• Sub- add/drop • Digital switching• Signal regeneration• PM & Error correction• Digital Protection• Digital OAMP

Digital Electronics& Software

Truly unconstrained reconfigurable optical networking


100 Gb/s Transmit

100 Gb/s Receive

So why hasn’t Digital Networking been implemented?Because OEO’s are expensive! Discrete Optics

Single WDM channel - - - - - - - - - - - - - - - - times 32, 40 or 80 wavelengths


100 Gb/s Transmit

100 Gb/s Receive

100 Gb/s Transmit

100 Gb/s Receive

Infinera’s Photonic Integrated Circuit Innovation

5mm

Direct Benefits Size, power, cost, reliability

Strategic Benefits Low-cost OEO conversion allows a Digital Optical

Network paradigm


Benefits of Electronics in Optical Networks

Reach Improvement- G.709 standard defines 6dB gain FEC (Reed-Solomon)

- High-gain FEC provides optical gain of 8dB to 9dB

- Corrects BER of 10-3 to BER of 10-17

Dispersion Compensation- FFE and DFE can compensate upwards of 1000ps/nm

- MLSE can correct upwards of 3000ps/nm dispersion

- Significant space savings vs. DCF

PM and Operations- OTH and SONET/SDH Overhead- Extensive digital PM at all OEO nodes

- J0/B1, BIP-8- FEC bit error rate monitoring- Communication channels for OAM&P

- SONET/SDH DCC and OTH TCM

Reconfigurable Switching- Wide choice of switching/grooming

granularity (VC-4, ODU-1, packet)- Fundamental to managing and

grooming customer services - Highest level of reconfigurability


Evolving to OTN Bandwidth Management

OC48/STM-16

OC192/STM-64

DS1/3 & E1/3

OC3/STM-1

OC12/STM-4

OC48/STM-16STS-1/VC-4 switching

SONET/SDH Networking

Optical/Wavelength Networking

O-E

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1 …N 1 …N

i, j

Digital sub- bandwidth management End-end digital OAMP & PMs Robust digital protection End-end service management

Multi-service support Transparent service transport WDM scalability and reach

n

. . . . .

GbE

10 GbE LAN PHY

OC48/STM-16

ODU1 (2.5G) switching

OCh (DWDM) at 11.1 Gb/s

OC192/STM-64

OTU1/OTU2

Digital sub- bandwidth management End-end digital OAMP & PMs Robust digital protection End-end service management

Multi-service support Transparent service transport WDM scalability and reach

(R)OADM switching

OTN Networking


Integrated Sub- Bandwidth Management

Conventional WDM Networks Separate WDM & OTN layers Sub- grooming only with

ODXC Manual grooming complexity or

extra cost for ODXC

Digital Optical Network - OTN Integrated WDM and OTN

bandwidth management Sub- grooming at every node End-end service management,

PM and OAM

Integrated end-end OTN digital optical networking at every node

OXC

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ODU1 bandwidth management

OTUk services


Digital Optical Network - Characteristics

100G digital bandwidth increments Readily deployable capacity usable by any service

Rapid service deployment Service activation is decoupled from transmission layer design and

constraints Enables efficient protection and restoration schemes Integrated sub-wavelength bandwidth management Automated GMPLS end-to-end service activation Built-in PRBS testing for service readiness

Digital Optical Networking approach provides future-proofing for 40G & 100GbE

Ease of reconfigurability at data plane, control plane and management plane


Dynamically Reconfigurable BandwidthGMPLS UNI

Applications of dynamically reconfigurable bandwidth Dynamic IP load balancing between routers Multiple circuits to time-share same bandwidth (“Time of day” services)

Digital Optical Networking unlocks full value of GMPLS UNI 100G+ service-ready capacity on each link Agnostic to transmission constraints 2.5G switching granularity

Router A

Router B

Router C

Router D

A

B

C

DGMPLS

UNI

Optical LSP Request

Dynamically allocatable IP capacityBaseline IP layer connectivity

IP Virtual Network Topology


Super- Next-gen Services

PIC enabled Digital Optical Networks provide scalable DWDM line capacity to accommodate higher speed services (e.g., 100G)

As IP Link sizes exceed optical line rate, IP core requires “Super-” services

<100G>

100G

Layer 3/2Router

Layer 1/0DWDM

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L1VPN Evolution

L1 VPNs should scale in two dimensions to accommodate future evolution L1VPN Size and Traffic growth

Control plane and management plane to scale accordingly

Ease of reconfigurability of both logical circuits & cross-connect capacity needs to be maintained

New Services Today most L1VPN designs want 1G-10G … with path to 40G & 100GbE services


Summary

L1VPN architecture involves data plane, control plane and management plane

Key Characteristics of L1VPNs Scalability Ease of reconfigurability Customized control

Digital Optical Networking Architecture provides key benefits for L1VPNs Service layer decoupled from transmission layer Integrated sub-lambda bandwidth management End-to-end GMPLS intelligence

key network architecture enablers for wavelength-on-demand and l1vpn services chris liou, infinera...

Documents

infinera slide

infinera confidential

physical carrier network

single carrier network

network abstraction

dedicated transport

gmpls slide

dynamic wavelength