Virginia Telehealth Network (VTN) Backbone Infrastructure Work Group ATM/Frame or MPLS

Virginia Telehealth Network(VTN) Backbone Infrastructure

Work Group ATM/Frame or MPLS

September 21 2006

Infrastructure Work Group 2

VTN Backbone Requirements

All traffic will be IP based Must provide priority for Video, Images and

Voice. (CoS or QoS) Users must be able to share a common

backbone to reduce cost Connectivity must be any to any

(Internet/Intranet like service) Must be able to transport IPv6 Must NOT be contract and carrier dependent

VPN is the way to go for VTN


Applications and protocols can sway the decision to MPLS Peer-to-peer driving

any-to-any Voice and video Unified Communication (Messaging, Media and Web

Conferencing) Non-IP protocols Broadcast or multicast Managing service quality with class

of service Layer 3 MPLS VPNs

typically have robust CoS Approach for QoS on Virtual Private Wire

Service based on underlying encapsulation


Evolution of the Market

2003 2005 2006

ATM

FrameRelay

MPLS (VPN)


0% 5% 10% 15% 20% 25% 30% 35% 40%

Availability

Scalability

Manageability

Cost

Reliability

Security

0% 10% 20% 30% 40% 50%

QoS

Security

Flexibility

Coverage

Cost

Reliability

Forrester’s Business Forrester’s Business Technographics, May 2005Technographics, May 2005

Yankee Group 2005 Yankee Group 2005 Metro Ethernet SurveyMetro Ethernet Survey

Top VPN Considerations?


Network Virginia Backbone

SprintLink

Abilene

SprintLink

Washington 1

Washington 2

RichmondRoanoke

RoanokeATM Switch

RichmondATM Switch

WashingtonATM Switch

Point to Point ATM Traffic



Internet Traffic Only





OC-3

OC-12


Customer Edge

Access ATM Core

ATM Switch

Backbone

T1, NxT1, T3, OC3

Other ATM networks

ATM / Frame Relay


ATM / Frame Relay Services (Layer 2)

Commercially available for more than 15 years

Layer 2 service over a shared, private network

Point-to-point switched service utilizing virtual connections

Most enterprise implementations are hub and spoke

ATM has a mature set of CoS capabilities

Frame Relay / ATMNetwork


ATM CoS

CoS Classes of Services Constant Bit Rate (CBR) Variable Bit Rate Real Time (VBR-rt) Variable Bit Rate Non-Real Time (VBR-nrt) Unspecified Bit Rate (UBR)


ATM Class of Service CBR (Constant Bit Rate) - Supported by a constant cell transfer rate, CBR is designed for

applications that require stable bandwidth levels and low latency (in other words, those which cannot tolerate variances in delay or cell loss). Examples of applications that require CBR service include boardroom quality video and private line circuit emulation.

VBR-rt (Variable Bit Rate Real-Time) - Designed for applications that require stable bandwidth levels and low-to-medium latency (in other words, those applications that cannot tolerate variances in delay or cell loss). Examples of applications that require VBR-rt service include desktop quality video and packetized voice applications. This service class can also carry SNA traffic. VBR-rt has a less stringent variance tolerance than CBR

VBR-nrt (Variable Bit Rate Non-Real-Time) – This service category is designed for servicing bursty data applications such as e-mail, Internet and other LAN data applications. This service class can also carry SNA traffic, if the CDV is set within acceptable limits.

UBR (Unspecified Bit Rate) - Unspecified Bit Rate (UBR) service is designed for data applications that do not require guarantees on when or if the data is delivered.


Cost for each Class of Service

Cost $

CBR

VBRrt

VBRnrt

UBR


The Future of Frame Relay and ATM

Service providers and network equipment vendors are investing heavily in newer generation technologies

Some service providers have announced an intent to decommission existing frame relay and ATM networks

Service providers will begin evaluating which emerging technology would be the best next step


““[MPLS VPNs’] true strength lies in its flexibility: [MPLS VPNs’] true strength lies in its flexibility: MPLS can provide the performance and MPLS can provide the performance and dynamic bandwidth characteristics of Ethernet dynamic bandwidth characteristics of Ethernet as well as the inherent resiliency of IP routing…as well as the inherent resiliency of IP routing…Providers design these networks today with Providers design these networks today with business customers in mind.”business customers in mind.”

– – Forrester Wave: North American Forrester Wave: North American MPLS Services, Q12006 MPLS Services, Q12006


Customer Edge

AccessMPLSEdge

Router

Private IP Core

MPLS (IPv6) IP

CoreProvider Edge

FR, ISDN, Dial or ATM

T1, NxT1, T3, OC3

Other MPLS, ATM, and Frame

networks (Internet 2)

MPLS is becoming Industry Standard


MPLS NetworkMPLS Network

Frame Relay Frame Relay Network EdgeNetwork Edge

MPLS VPNs (Layer 3)

Also known as RFC 4364 VPN, RFC 2547-bis VPN

Commercially available for seven years

IP-based service delivered over shared networks (public and private IP)

Multipoint routed service Service typically can support

multiple encapsulations to allow for seamless migration from other technologies

Robust QoS utilizing DiffServ


The Future of MPLS VPNs

These services have hit critical mass for most service providers

Providers continue to invest heavily in both network expansion and service surround Simplified migrations from legacy technologies Flexible network management options and

customer reporting Broadening suite of access options


Why QoS?

Controls Latency sensitive data such as Video and Voice Admission control – bandwidth control and policy control Resource Allocation – Queuing and scheduling – Traffic

flows and traffic classes Gatekeepers – Network administer – manages the pool of

available bandwidth Types:

IP Precedence Differentiated services (Diffserv) Integrated services (IntservRSVP)

QoS must be available all the way to the end equipment


Optimized Queuing Using QoS

11VideoTraffic

22LAN

Traffic

33 3InternetTraffic

23 2 11

Transmitring


Better Quality of service Better security services through VPNs Moves data packets across the backbone faster and

more efficient IPv6 can implement multi-cast in the IP protocol unlike

IPv4 IPv6 has a new class of service called “any cast” which

routes data to and from the nearest host. "Shortest Route”

IP protocol running on Internet 2 backbone

Why IPv6?


Network Cost Efficiencies and Simplification Realized in MPLS Network

Network Cost Efficiencies and Simplification

MPLS Network

Any-to-Any IP Connectivity (MPLS)

Host #1 Host #2

Traditional Frame Relay, ATM or Private Line Networks

Host #1 Host #2


IP over ATM Issues IP over ATM has the potential to create bottlenecks leading

into the core resulting from the lack of segmentation and reassembly (SAR) functional on OC-48 and faster interfaces.

IP over ATM results in an inefficient use of network bandwidth due to the traditional ATM cell tax.

The IP differentiated Services (DiffServ) approach to class of service (CoS) does not map well to existing ATM quality of service (QoS) mechanisms.

TCP/IP is an inherently inefficient protocol to run over an ATM transport, because the transmission of a single ACK requires not one but two ATM cells.


Summary of Considerations

ATM MPLSReliability/

Performance

Yes Yes

Network Security Yes Yes

Any to any connectivity NO only point to point Yes

Multicasting capability NO Yes

DiffServ NO only CoS Yes (QoS) and can be changed on the fly

Nx64k service NO Yes

ATM and Frame Compatible Only ATM LPWS – can do Frame and ATM

Ethernet access NO YES


Pricing Elements

ATM (Network Virginia) Local Loop Port Speed (based on

CoS) CBR VBRrt VBRnrt

Minimum Contract Period is one year (??)

MPLS (VTN) Local Loop Port Speed with QoS

included Minimum Contract Period

is 4 months


Example One


IP over ATM (Network Virginia)

Router

DATA Switch

PSTNISDN

Video InfrastructureGateway

MCU

Gatekeeperproxy

MCURouter

Regional Site A

Main Site

Router

Regional Site B

RouterRegional Site C


Router

DATA Switch

Video InfrastructureGateway

MCU

Gatekeeperproxy

MCURouter

Regional Site A

Main Site

Router

Regional Site B

RouterRegional Site C

VTN

IP over MPLS (VTN)


Example Requirements

ATM MPLSSite Site services

RequestedSite

Bandwidth Requirements

Local Loop Requirements

Port Speed Requirements

Local Loop Requirements

Port Speed Requirements

Main Site Two Video Channels

2 x 384kbps = 768kbps

2 x DS1 (1,544kbps)

1,544kbps DS1 (1,544kbps)

768kbps

Regional Site A

One Video Channels

384kbps DS1 (1,544kbps)


384kbps

Regional Site B

Two Video Channels

2 x 384kbps = 768kbps

2 x DS1 (1,544kbps)


768kbps

Regional Site C

One Video Channels

384kbps DS1 (1,544kbps)


384kbps

TOTALS 2,304kbps 9,254kbps 6,176kbps 6,176kbps 2,304kbps


Pricing Monthly Model

$0

$1,000

$2,000

$3,000

$4,000

$5,000

$6,000

$7,000

$8,000

ATM MPLS

Local Loop

Port Charge

Total

The above cost are based on market rates


Yearly Cost Model

$0

$10,000

$20,000

$30,000

$40,000

$50,000

$60,000

$70,000

$80,000

$90,000

ATM MPLS

The above costs are based on market rates

Virginia Telehealth Network (VTN) Backbone Infrastructure Work Group ATM/Frame or MPLS

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