Packet Centric Transport in NG Hybrid TDM/Packet/WDM Transport NetworksEnrique Hernandez-Valencia Alcatel-Lucent Optics CTO Group

Internet 2 - Summer 2007 Joint Techs Workshop Fermilab - Batavia, IL

July 15-18, 2007.

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Agenda

1.Transport Network Evolution Drivers2.NG Hybrid Transport Node Models3.Packet Transport Framework4.Closing Remarks

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Service Drivers

In an All-IP, blended services world, traffic must be aggregated and transported over

distance with high resiliency at the lowest

cost per bit

In an All-IP, blended services world, traffic must be aggregated and transported over

distance with high resiliency at the lowest

cost per bit

Transport Network Evolution Drivers

Transport Network Investments (Aggregation)

SDH/SONET

2000 2003 2006

Metro

Core

Access

EoS

2009

SDH/SONET SDH/SONET SDH/SONET

EoS

Carrier Ethernet

(e.g. MPLS)

NGPacket

Transport

Internet Access Switched Ethernet

Bus/Res 3-Play

Switched Ethernet

Fix/Mobile Convergence

Bus/Res 3-PlaySwitched Ethernet

ROADM

T-ROADM

EoS

Enterprise

Ethernet

Hybrid Packet Transport

Application service layer convergence on IP

Transport service layer moving to Packets

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Transport Network Equipment – Requirements & Enablers

Reliable aggregation and transport of any client traffic type, in any scale, at the lowest

cost per bit

Reliable aggregation and transport of any client traffic type, in any scale, at the lowest

cost per bit

Transport NetworkTransport Network

ScalabilityScalability

Ability to support any number of

client traffic instances

whatever network size, from access

to core

Ability to support any number of

client traffic instances

whatever network size, from access

to core

QualityQuality

Ability to ensure that client traffic is reliably delivered at monitored e2e

performance

Ability to ensure that client traffic is reliably delivered at monitored e2e

performance

Multi-serviceMulti-service

Ability to deliver any type of client

traffic (transparency to

service)

Ability to deliver any type of client

traffic (transparency to

service)

Cost-EfficiencyCost-Efficiency

Acting as server layer for all the rest by keeping

processing complexity low and operations

easy

Acting as server layer for all the rest by keeping

processing complexity low and operations

easy

Transport values have evolved through long TDM evolutionThey hold through transition to packets

Networking Layering

Domain Partitioning

Networking Layering

Domain Partitioning

Client agnosticism(any L1, L2, L3)

Client agnosticism(any L1, L2, L3)

Connection oriented

OAM, resiliency Traffic engineering, resource reservation

Connection oriented

OAM, resiliency Traffic engineering, resource reservation

CAPEX: low protocol complexity

OPEX: multilayer operations across Packets/TDM/λ

CAPEX: low protocol complexity

OPEX: multilayer operations across Packets/TDM/λ

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Universal Switching Integrated TDM/Packet switching architecture Switching synch traffic (circuits) or asynch traffic

(packets) in native format (technology-independent) Non-stop forwarding (not affected by traffic congestion)

Universal Switching Integrated TDM/Packet switching architecture Switching synch traffic (circuits) or asynch traffic

(packets) in native format (technology-independent) Non-stop forwarding (not affected by traffic congestion)

Specific Traffic Processing Line Cards Technology-dependent traffic line cards Host tech specific traffic processing functions

(classification, policing, perf. monitoring, OAM, etc) Open to any packet-based transport protocol,

focused around carrier grade layer 2 transport such as Ethernet Provider Bridging & T-MPLS

Specific Traffic Processing Line Cards Technology-dependent traffic line cards Host tech specific traffic processing functions

(classification, policing, perf. monitoring, OAM, etc) Open to any packet-based transport protocol,

focused around carrier grade layer 2 transport such as Ethernet Provider Bridging & T-MPLS

Photonics Integration CWDM/DWDM, OADM, Mux/Demux, Transponders ROADM, OTH

Photonics Integration CWDM/DWDM, OADM, Mux/Demux, Transponders ROADM, OTH

Hybrid Architecture for Next-Generation Transport

Client Processing decoupled from Switching

Universal TDM/Packet

Switch

Universal TDM/Packet

Switch

Photonic

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Carrier Ethernettransport model

MSPP model

100% Circuit 100% Packet

SONET/SDH model

TDM card Packet card

Photonic card

Universal Switch

Universal Switch

Universal Switch

STM-1OC-3

E1/DS1

OC-192 STM-64 10GE GE FE

10GE

Any Traffic Mix

OC-192 STM-64

C/D-WDM ROADM

GE/FE10GE

C/D-WDM ROADM

Native switching of synch traffic (circuits) and asynch traffic

(packets)

Seamless Network Transformation to All-Packet Transport

Freedom in planning network resources, reduced investment risk Cost-optimized network consolidation

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Hybrid-Fabric ApproachesDual Packet-TDM Fabric

Attributes:

Dual TDM/Packet Star

Separate TDM/Packet backplane traces

Advantages:

Native TDM (e.g. crossbar) and Packet (e.g., self-routed) fabrics support & feature set

Leverage OTS components

Drawbacks:

Duplicated modules (cost & footprint)

Duplicated backplane traces (CAPEX)

Independent subsystem technologies to be managed (OPEX)

TDM Card

XSFP

XSFP

Map

per/

Fra

mer

TD

M

BP

In

t.

Packet Card

XSFP

XSFP

NP

U

& T

M

Packet

BP

In

t.

TDM Card

XSFP

XSFP

Map

per/

Fra

mer

TD

M

BP

In

t.

Packet Card

XSFP

XSFPN

PU

&

TM

Packet

BP

In

t.

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Hybrid-Fabric ApproachesCentral Packet Fabric

Attributes:

Single packet fabric instance

Single-set of backplane traces

TDM emulation toward fabric

Advantages:

Leverage OTS packet processing components

Single (packet-oriented) control framework

Drawbacks:

Stringent packet/cell processing constraints to support TDM traffic emulation requirements

Higher TDM card cost from CE functions

TDM Card

XSFP

XSFP

Map

per/

Fra

mer

CES

B

P In

t.

Packet Card

XSFP

XSFP

NP

U

& T

M

Packet

BP

In

t.

TDM Card

XSFP

XSFP

Map

per/

Fra

mer

CES

B

P In

t.

Packet Card

XSFP

XSFPN

PU

&

TM

Packet

BP

In

t.

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Hybrid-Fabric ApproachesCentral TDM Fabric

Attributes:

Single TDM fabric instance

Single-set of backplane traces

Arbitrated TDM fabric access

Advantages:

Native synchronous fabric (low cost)

Single TDM-oriented control framework

Drawbacks:

More complex fabric access arbitration for packet cards

Fabric scaling to higher data rates?

TDM Card

XSFP

XSFP

Map

per/

Fra

mer

TD

M

BP

Int.

Packet Card

XSFP

XSFP

NP

U

& T

M

Packet

BP

In

t.

TDM Card

XSFP

XSFP

Map

per/

Fra

mer

TD

M

BP

Int.

Packet Card

XSFP

XSFPN

PU

&

TM

Packet

BP

In

t.

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Hybrid-Fabric ApproachesTradeoffs

Key hybrid-fabric tradeoffs:

Parallel Packet-based and TDM-based solution achieve high functionality with low component integration (multiple devices) and, hence, higher cost

Packet-based solutions require TDM-to-packet conversion on I/O Ports – High Cost – and greater performance budget (jitter and delay sensitivity) w.r.t TDM service

TDM-based solution delivers compatible with TDM performances w/o penalties on costs & provide option for interoperation with TDM only I/O

Extra Cost on Data boards,

Full or partial board capacity

Packet

Packet

TDM TDM

A Multi-Service TDM fabric allows flexible and cost-effective cross-connection of SONET and G.709 OTN) containers and..... Packet Switching!

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Fabric Access controller

I/O & Agnostic TDM Fabric Connectivity: A typical Implementation

Universal

Switch

TDM/WDM

Line Card

TDM/WDM Line

Card

Connection between TDM/WDM Line Card Input/Output ports are Static

There is a static 1-to-1 relationship between input port signal and output port signal

Packet Line Card

Packet Line Card

Packet Line Card

Connection between Packet Line Cards are Dynamic to allow packet aggregation

There is a dynamic N-to-1 relationship between input port signal and output port signal (e.g., re-arrangeable CLOS)

I1

IN

O1

ON

SXY

SIO(t) = 1, if I=X and O=Y t

0, otherwise

SIO(t) = 1, if I=X and O=R(t)

0, otherwise

SUV

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Packet Transport Aggregation Framework

Based on a connection-oriented packet switching (CO-PS) model Intended as a carrier grade all-packet transport technology

Packet-oriented forwarding Complemented with comprehensive OAM and resiliency capabilities

Profiled after the L2 aspects of IETF MPLS technology Synergy with IETF IP/MPLS-based service networks and models (inc. multipoint

emulation via VPLS/H-VPLS) Simpler in forwarding scope, less complex in operations (no native IP forwarding)

Can operate independently of their clients (e.g., Ethernet, IP/MPLS, etc.) and associated control networks (management and signaling)

Being specified under ITU-S Study Group 15 (Rec. G.8110.1) & IETF PWE3 (as “MPLS Transport”)

IP/MPLS

Ethernet

Others

T-MPLS Channel

(PWE3 based)

Optical-Packet Transport Network

T-MPLS Link/Secti

on

T-MPLS Path/

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Control Plane Directions: ASON/GMPLS

GMPLS proposed as the single generalized distributed control plane to be used form common control protocol for multiple networking technologies environment, including Packets, TDM/Optical and/or Photonics

GMPLS already define support for: UNI, I-NNI and E-NNI interfaces (thus easing overlay dynamic

approach) Bidirectional & Unidirectional paths

GMPLS also allows for separation of data plane and control plane Only control interfaces are used to flood control information

GMPLS allows for “horizontal” scalability in routing domains (thanks to separation of data plane and control plane and recursive topology)

GMPLS allows for “vertical” scalability (same control plane across photonic, TDM and packet layers)

GMPLS is the ideal control plane for multilayered networks

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Hybrid Transport-Switch implementation

Transport instance target vision

ODU - lambda

Och Switch

Lambda(ALU colored)

ODU - lambda

Packets

CBR

Line

CBR(2,5Gb/s)

TMPLS - ODU

MPLS switch

L2/L3 -Packet

ODU - lambda

CBR - ODU

ODU - lambda

CBR(<2,5Gb/s)

SDH - ODU

SDH switch

CBR – SDH

ODU - ODU

ODU switch

CBR - ODU

Typical metro node

implementation

Typical metro node

implementation

Typical WDM node

implementation

Typical WDM node

implementation

Typical Core node

implementation

Typical Core node

implementation

General Transport Switch

architecture

General Transport Switch

architecture

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Purposely designed for carrier-grade Packet Transport Networking

Synthesis of best-in-class packet (IETF) and transport (ITU) features MPLS profiled, but transport-oriented (wrt. OAM/Resiliency/PM) Client-independent, medium-independent (Multi-service) Scalable forwarding, control/management planes (via ASON/GMPLS) Cost-effective (simple forwarding & comprehensive operations

capabilities)

Purposely designed for carrier-grade Packet Transport Networking

Synthesis of best-in-class packet (IETF) and transport (ITU) features MPLS profiled, but transport-oriented (wrt. OAM/Resiliency/PM) Client-independent, medium-independent (Multi-service) Scalable forwarding, control/management planes (via ASON/GMPLS) Cost-effective (simple forwarding & comprehensive operations

capabilities)

Carrier Ethernet/MPLS TransportGeneralized MPLS Control Plane (G-

MPLS)Optical Transport Hierarchy (G.709)

SDH/SONET

Circuit Transport

Packet / Photonic Transport

STM-n/OC-x Servers

VC/VT Clients

Service

OAM OAM

Servers EthernetClients

ServiceWDM WDM

OchODU T-MPLS

Transport Service Switch

TDM

TDM

An Scalable Hybrid Transport Architecture

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