five essential elements of future brian smith research networks...

Five Essential Elements of FutureResearch Networks

Brian SmithProduct Manager

CENIC `07MAKING WA VES

Preamble: The Transition to21st Century Transport Networking

20th Century

Fundamentally changing the transport infrastructure

Switching of connections(Subrate λ paths and full λ paths)

Transmission of bits

Closed OADM ring

Separation of EthernetAggregation layer andOptical domain

Multi-ring access and multi-degreeswitching

Convergence of the Ethernet-Optical layer

21st Century


What are the Five EssentialElements ?

Reconfigurability

Scalability

Efficient use of wavelengths

Multi Degree Operation

Automated Planning/Management

Cost effective balance betweenstatic and dynamic traffic

Provide wide range of servicesto research community asdemand changes

Maximize the use of availabletimeslots – reduce wavelengthcount – more cost effectivenetwork

Interconnected rings or mesh –switching at wavelength andsub-wavelength levels

Complex networks requireoptimization / provisioning /monitoring



Reconfigurability Cost effective balance betweenstatic and dynamic traffic


Reconfigurability

Take CalREN as an example: Shared infrastructure providing different service tiers (DC, HPR and XD)

DC network - may not require reconfigurability HPR - Dedicated GigE connections between labs for demos – rapid set up

and tear down XD – reconfigurable GigE paths and optically switched lambdas with rapid set

up and tear down

So there’s a mix of permanent and dynamic circuits Dynamic traffic at the wavelength, sub-wavelength and VLAN level Future Distributed User Control of service paths GigE, 10GigE, 40Gbps and 100Gbps

Need Ethernet connectivity that is Cost effective across the capacity range Agile


Optical Reconfigurability

SLO

OAK

FERG

RIVLA

A

A

A-A Initially 10GigE between LAand San Diego (Caltech – SCC) Change Circuit to go

between LA and SUNN(Caltech – Stanford LinearAccel)

ROADM (WSS) facilitates λswitching in Optical Domain

• Requires transponderequipment at endpoints only

• All other nodes unchanged• Saves Cost• Saves Churn

SAC

BAK

SAND


SUNN

A

ROADM Enabled Systems

WEST DROPsWEST ADDs

EAST DROPs EAST ADDs

WEST EXPRESS

EAST EXPRESS

λ1 λ3 λΝ λ1 λ4 λX

OpticalAmplifiers

OpticalAmplifiers

DWDMLINE IN

DWDMLINE OUT

ROADMModule

ROADMModule

ROADMModule

ROADMModule

Transponders

This is where the ROADM (WSS) enabled system comes in . . .

• Engineered day 1 for Any-to-Any (any wavelength from any node to any node)

• Automated provisioning and control of optical amplifiers

• Each new service automatically routed, provisioned and balanced using GMPLS control plane

• New services can be provisioned in hours rather than weeks.



Reconfigurability

Scalability




Scalability

Add wavelengths with no service impacts

Add wavelengths with no requirement for network re-provisioning (amplifiers etc)

Seamless overlay of 10G and 40G (100G?) on the same fiber

Addition of on-grid Alien Wavelengths


ScalabilitySLA to Caltech Initially at 10GbpsUpgrade to 40Gbps

Caltech to SCC (San Diego)-Initially at 1 x 10GbpsUpgrade to 10 x 10Gbps

Sunnyvale to Sacramento Add New 10GE Circuit

• WSS Optical Switchingrequires equipment changesat endpoints only

• All other nodes unchanged• Saves Cost, Churn

• Capacity is added where it isneeded, when it is needed…


SLO

OAK

FERG

RIVLA

B

A

A

C

SAC

BAK

SAND

SUNN

B

C


Reconfigurability

Scalability






Efficient use of Wavelengths

‘ADM-on-a-Wavelength’ technology provides full add/dropcapability for multiple GigE and rate limited GigE on a singlewavelength

Sub-Wavelength Switching technology provides full add/dropand switching/grooming capability for multiple GigE and ratelimited GigE between wavelengths and between degrees

Layer 2 Ethernet Tunnel Switching provides switching/groomingand flow control of of services within an GigE sub-wavelengthpath


The Converged Transport Node

Current Node Architecture

Multi-Platform

DWDM

OXCL2 Switch

Campus1

Campus2

Converged Node Architecture

Single Platform

ROADM

ROADMCampus1 Campus2

SWS

L2

Dedicated GigE services

L2 Ethernet Tunnels

DWDMDWDM



Reconfigurability

Scalability








Beyond Two DegreesExample: Multiple Rings

A

A

C

C

A

How to do this effectively whileretaining :

• Dynamic Reconfigurability

• Non-Blocking

• “Virtual Lambda” efficiencies

10GigE

1GigE


Multi-Degree Operation

Wavelength and Sub-Wavelength Switch• Multi-degree Electrical switching and Optical Switching functionality

integrated on one platform• Non-blocking switching of Full-λ Wavelengths, Sub-λ “Virtual Wavelengths”

and L2 Ethernet Tunnels between fiber degrees. Full add/drop of sub-λtraffic at 2 degree nodes

• Not limited to 4 Degrees - Enables Optical Layer Mesh…

λ

Sub-λ+L2

Switch

Opt

ical

Opt

ical

λ

Sub-λ+L2

Switch

Opt

ical

Opt

ical

λ

Sub-λ+L2

Switch


ADM/λ

+L2

ADM/λ

+L2

ADM/λ

+L2

ADM/λ

+L2

ADM/λ

+L2

ADM/λ

+L2


Reconfigurability

Scalability



Automated Planning/Management





Complex networks requireoptimization / provisioning /monitoring


Automated Network Planning

Networks are becoming more complex with routingrequirements at the Wavelength, Sub-Wavelength and EthernetTunnel level

The only cost effective way to manage this complexity from anetwork design perspective is through the use of NetworkPlanning Tools.

These tools should simplify the process of: Optical layer optimization (power, dispersion maps and OSNR) Traffic and Equipment optimization

Lowest cost network vs minimum number of wavelengths deployed

Ordering network equipment Installing the network (site preparation and node installation)


Automated Network Planning System

Optical layer designCalculate OSNR,

nonlinearities & dispersionpenalties

Allocate equipmentDesign for Any-to-Any

connectivity

Traffic planningInput services via drag and dropCalculate most efficient use of

wavelengths and capacityMinimize cost and/or resource

usageNetwork Import/Export capability


Network Management SystemSimplify Routine Functions

Integrated with network and element management functions Point-and-click Lightpath provisioning

Operator-Selected Routing and . . . Automatic Lightpath Routing

End-to-end lightpath protection Non-disruptive Live Routing Changes

Reduce Errors Auto-discovery of equipment, topology,

and connections Automatically detect fiber cabling errors

Provide Advanced, Time-Saving Features Performance management Remote loop-back management Single view for all equipment


Network Management– Looking Forward

Researchers

Scheduling interface Lab 1

Lab 2

NMS System:

•Manages resources available

• Manages access

• Provisions paths based on user requirements

• User requests connection

• Signaling and bandwidth allocation controlled byequipment – ASON control plane

• possible for connection on private network(R&E)

• unlikely between different tier 1 carriers

• NMS manages maintenance and signaling policy


NMS

NMS

Summary

Reconfigurability Any Circuit, Anywhere, On Demand…

Scalability Incur cost and churn only When and Where it is required Future-proof for Higher Capacities

Network Efficiency Effective use of capacity for lower rate (Sub-Wavelength) circuits

Multi-Degree Operation Non-Blocking operation for > 2 Degrees Support for Sub-Wavelength circuits and Ethernet Tunnels

Network Planning and Management Simplified Creation, Operation and Upgrade of the Network Optically Engineered for future lambda rates


Questions ?

Efficient Use of Wavelengths:Sub-Wavelength Aggregation

ADM-on-a-Wavelength Transponders incorporate standards compliant ADMfunctionality on a pair of line-cards

Effective utilization of every wavelength (per wavelength, VC3/STS-1 level grooming)

Add/Drop or optically bypass any aggregation wavelength at any node

Dramatic Reduction in the amount of equipment Sub-λs are “Virtual Wavelengths” for lower-rate circuits (GigE) 9 x Full GigE per 10G λ

ADM terminal is replacedby a pair of E-W transponders

ADM ring becomes awavelength in the WDM ring

Stacked ADM Rings

e.g. 40 boxes 4

10 NEs/site


ADM on a λ Application Example:


1. 3 RL GbE per site 4x3x10=120 30 12. Agg 2xGigE on 2.5G 4x2x10=80 20 1

3. Use L2 Switch per site 4x1x10=40 10 11

3. Use ADM on a λ 2x13 = 26 1 1

#TRs #WLs #Eth

Converged Ethernet Optical Network

WavelengthSwitching

Sub-WavelengthSwitching

EthernetTunnel

Switching

C/DWDM fiber pairs Grey interfaces: GigE/10GigE, STM-n/OC-n

From anyport, wavelength, or Ethernettunnel

To any otherport, wavelength, or Ethernettunnel.

Multi-degreewavelength transport

and switchingvia OEO and WSS

Layer 1-basedEthernet

Sub WavelengthSwitching

Layer 2Ethernet

Switching++ … in a single platform

Integrated Service Switching for Future R&E Networks


five essential elements of future brian smith research networks...

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