Flow-based Managed IP Solution -QSSFlow-based Managed IP Solution -QSS

BCN core 네트워킹 QoS 보장 기술

2005.1.27

한국전자통신연구원

광대역통합망연구단

1Proprietary

목차목차

BcN

QoS 보장 기술

QSS Solution

Application

2Proprietary

BcN서비스방향BcN서비스방향

Corporate/ & High-End SMEs

Corporate/ & High-End SMEs

ResidentialResidential

SMESME PersonalPersonal

Packet Voice Service

Business Service (LL/VLL, VPN, Managed Service)

Value-added Service

Multimedia

Mobility, Personalization, DMB

•Broadband•QoS(Connection-Oriented)

유무선/통방 융합

Anytime, Anywhere & Any Devices Ubiquitous

도입단계

성숙단계

발전단계

3Proprietary

BcN 기본구조BcN 기본구조

MobilityPersonalization

More BandwidthGuaranteedConverged

IT Contents Service

Access Network

Managed IP Network

• xDSL, Ethernet• WLAN• Mobile

응용계층응용계층

전달계층(코어)

전달계층(코어)

CustomerCustomer

MPLS-based Connections

OAM&P보안IPv6

/MulticastQoS

전달계층(액세스)

전달계층(액세스)

SoftswitchCall control

QoS Manager

제어계층

제어계층

운용관리계층

운용관리계층

4Proprietary

BcN구축요건BcN구축요건BcN 요구사항

Broadband

Quality of Service

IPv6

Open API

전달망 요구사항

More “Reliable & Manageable”Centralized Control

Service : Legacy + New Service

Network Element : Simple

전자정부망

장애대응체계

자동복구

신고하지 않아도 자동보상 되는 SLA

5Proprietary

라우터기술추세라우터기술추세

지난 30년간시장요구사항수용을위해 끊임없는기술보완

(Cisco는 ’03년 IIN 개념, ’04년 CRS New Router 발표 : Lock-In Policy)

(~ RFC ?????)

(~ RFC 3810)

(~ RFC 2702)

(RFC 1 ~ RFC 2136)

1969 2004. 6 Time1996 1999

•ATM•FR

•T.E•CoS

전송품질

Complex

10-3 ~ 10-4

10-6 ~ 10-7

10-8 ~ 10-12

•QoS •통신 = Cisco•PC = Microsoft

• RFC(Request for comment) : 라우터가 수용해야 할 표준안• IIN : intelligent Information Network• CRS : Carrier Router System (640GB ~ 92TB) – 끊임없는 Over-Provisioning 필요

6Proprietary

진화의방향 - 2010년기술예측진화의방향 - 2010년기술예측

Vision : Ubiquitous Communication

Telephone Age

Internet Age

Interactive Age

Advantage• Quality• Reliability

Disadvantage• Cost• Complexity

Advantage• Global Connectivity• Low CostDisadvantage

• Quality• Security• Less Business Model

Client-Server End-to-End

5 ~ 10 Years(Broadband, Mobility)

Until Now

Until Now

FutureFuture

Centralized TypeCentralized TypeDistributed Type Distributed Type

New IP

ATMfailed

= BcN(≠ IP Upgrade)

[출처 : NTT: Resonant Network Vision]

7Proprietary

BcN 서비스및품질관리요소BcN 서비스및품질관리요소

SLA관점의 성능 파라미터 특성

Class Bandwidth Availability Loss Rate Delay JitterVoIP

Video Telephone

멀티미디어서비스

:

VLL

L2/3VPN

단계적정의

8Proprietary

Packet Network의 AvailabilityPacket Network의 Availability

성숙 곡선

구 분 네트워크 가용성 수준 성숙기간

TDM, SDH 현재 : 99.999 % 15년

현재 : 99.x % < 5년

목표 수준 : 99.999 % ?IP

[자료 : BCR, 2002.6]1 3 5 7 9 11 13 15

99.999%

Net

wor

k A

vaila

bilit

y

2002

IPTDM, SDH

200499.x%

Year

9Proprietary

Managed IP – Controllable IPManaged IP – Controllable IP

Decoupling & CentralizationStableScalableEfficient

Intelligence

ComplexNetwork

Switch

Service

Switching

Transport

• Simple• Reliable• Inter-Operable• Integrated Control

•Topology Management•Resource Management•Policy Management•SLA Management•Network Security Management•Global Mobility Management

SimpleNetwork

Service Edge

Softswitch

Switch

SwitchingTransport

Operator

ControlPlatform

Proper Signaling

10Proprietary

Managed IP - QoSManaged IP - QoSAdmission Control – Based on SLS given by operator

Resource Allocation – Based on monitored SLS

Traffic Control – Micro flow, Packet based WFQ

Diffservnetwork

Diffservnetwork

AF 100 Mbit/sAF 100 Mbit/s

AF 100 Mbit/s

AF 100 Mbit/s

AF 100 Mbit/s

AF 10 Mbit/sVideoserver B

Videoserver A

Videoclient A

Videoclient B

Videoclient C

50M

10M

Resource Mediator(QoS Manager,

Bandwidth Broker)

서비스 불가

50M

Server B -> Client B : 50M

11Proprietary

Managed IP – OAM & StatisticsManaged IP – OAM & StatisticsSLA 기반 보장 서비스

Standard Time

Identifier Availability Bandwidth Performance Delay Jitter Loss Rate

전달망

Connection ID : 5OAM OAM

OAM Frame Insertion

OAM Frame Processing

[Statistics for SLA]

• Statistics• Trap (MPLS, VLAN Fault)

NTP

MPLS OAM and Statistics per LSP

VLAN OAM and Statistics per VLAN (Delay, Jitter, Time to Fault and Recovery)

Connection별 품질 지표

12Proprietary

Managed IP – Network ReliabilityManaged IP – Network Reliability

Reliable Return Path

LSP level : Continuity Check (including Post-protection)

Link/Node Level : FIS (Fault Indication Signal)

Requirement of Reliable Return Path : No sharing of Link/Node for a LSP

IngressIngress EgressEgress

OAM Packet OAM Packet

OAM Packet은 Transit

Return Path필요시 Backward Reporting (Ping, Traceroute, BDI, 등)

LSP

BcN Domain제어플랫폼

• Periodic Reporting• Polling/Trap• Diagnosis

13Proprietary

<Traditional IP>-Distributed Topology discovery-IP Reachability Management-Data Forwarding-Diffused Fault Recovery

<IP/MPLS>-Distributed Topology discovery-IP Reachability Management-Diffused Fault Recovery-Data Forwarding+ Diffserv Data Forwarding+ Flow control+ Statistics+ Policy-based TE+ Signaling+ OAM+ Resource discovery+ Mobility+ VPN Control+ Security

IP+MPLSMore complex !

<Managed IP>-Inter-subnet IP Reachability-Localized Fault Recovery-Scalable end-to-end OAM-Flow-based QoS Forwarding-Flow-based Statistics

(IP+MPLS)’=Managed IP

NetworkControlPlatform

•Topology Management•Resource Management•Policy Management•SLA Management•Network Security Management•Global Mobility Management

Decoupling & Centralization

Managed IP – ConceptManaged IP – Concept

14Proprietary

라우터망에서 QoS도입시도라우터망에서 QoS도입시도

Best Effort IP

T.EIntServ DiffServ

•망의 부하 분산을

통한 품질 개선

•등급 단위의 단순

차별 전달 서비스

(제한적 CoS)

•QoS 도입 노력

포기

• ATM 방식(End-to-EndConnection)

•신호 오버헤드로Scalability 없음

한계

한계: DiffServ +

Cisco, Juniper

• DiffServ over MPLS• DiffServ-aware TE

New Approach

• IP Session별 품질 보장

• PS 기반 중앙 집중 제어

Microflow별 QoS 보장

IP Flow/Sessionbased TE

VS.

ETRI + Caspian

DiffServ over MPLS(RFC 3270)

DiffServ-aware MPLS TE (RFC 3564)

Flow/Session-based TE (NEW)

15Proprietary

Flow/Session -Level IntelligenceFlow/Session -Level Intelligence

Flow-State RouterConventional Router

PortClass

Knowledge of class/aggregate only

PortClass

Knowledge of flows inside aggregate

Per Flow Treatment Under CongestionFairness modelsRate guarantees for flowsTarget specific flows for discard (misbehaving flows)Per-flow shaping, policing, CAC

Random Discard Under CongestionAll flows get same treatment Misbehaving flows impact well-

behaved flows

Limitations of policy-based QoS !

Ref.) Caspian Networks

16Proprietary

Flow-based Switching 개념Flow-based Switching 개념

Traditional Router 특성

제한적인 Class of Service

Best Effort

Non-Guaranteed

Caspian’s Flow Router 특성

1.5M per Sec. 신규 Flows 생성

Concurrent 6M Flows per 10Gbps

Intelligent Policing, Shaping

Packet 순서 및 Delay / Jitter 보장

Best of Both ATM and IP

Call/Sec BW Guarantee Delay Guarantee

Flow Switching 1,500,000+ YES YES

IP Routing NA NO NO

ATM Switching 수천개 YES YES

COS

Micro-flow

.

.

.600만개

17Proprietary

CoS와 Micro-flow의개념비교CoS와 Micro-flow의개념비교

CoS (Class of Service)

Micro-flow

COS

B.E

Microflow

.

.

.600만개

18Proprietary

End-to-End QoS보장을위한방안End-to-End QoS보장을위한방안QoS 관리

Provisioning Server : 망차원에서 QoS 보장

Microflow 기반스위치 : 노드내에서데이터 QoS 보장

Congestion

End-to-End QoS 필요 : PS

Node 내의 End-to-End QoS : Flow

Node

PS

NodeNode

Micro-flow base QoS 관리의장점

Premium Flow 2

GR Flows

Premium Flow 1

Premium Flow 4

Premium Flow 3

각 Flow별로 10M 할당

10M

10M10M

10M

Flow1 이50M 사용

Premium Flow 2GR Flows

Premium Flow 1

Premium Flow 4Premium Flow 3

25M5M

5M5M

기존라우터 : 전체 Connection의품질저하

Premium Flow 2

GR Flows

Premium Flow 1

Premium Flow 4Premium Flow 3

10M10M

10M10M

Micro-flow 기반스위치 : 위반한 Flow1만 Drop

19Proprietary

Session Flow-State vs Other Flow ConceptsSession Flow-State vs Other Flow Concepts

Flow: Def’n is flexible, but generally any unique combination of 5 tuples:

Source AddressDestination AddressSource PortDestination PortProtocol

State: Managing and maintaining the following information for each flow:

Switch Fabric RouteNexthopClassRateDelay VariationByte CountFlow DurationPackets Received/Dropped, Bytes Received/Dropped, etc.

Forwarding Info

QoS Info

Statistics InfoNetflow

Cisco CEF/Riverstone

Ref.) Caspian Networks

20Proprietary

Economics of Flow RoutingEconomics of Flow Routing

R o u ter P rice w ith 8 H ig h S p eed P o rts

100

200

300

400

500

1970 1975 1980 1985 1990 1995 2000 2005 2010

$ K

Flow Routing

Packet RoutingMemory Cost For Flow State

Flow Routing

Utilization Gain

Ports are of Highest Speed Available in that Year

Flow Routing Infeasible Flow Routing Inexpensive

Ref.) Caspian Networks

21Proprietary

QSS Development StrategyQSS Development Strategy

Centralized Control 개념 도입

MPLS 장비 단순화, 호환성 보장

• Topology Discovery

• Path Calculation/TE

• Admission Control

• Policy Management

CentralizedControl

QSS

•맞춤품질•가격 대비성능 개선•호환성 보장

•맞춤품질•가격 대비성능 개선•호환성 보장

Σ

• OAM

• Traffic Management

• Simplified MPLS

• Session Flow QoS

• Statistics per SessionCaspian’s

Flow Router

Simple,Real Approach

ATM,MPLS

22Proprietary

QSS based ServicesQSS based Services

GbE/10GbE

• Flow based VPN (IP/Ethernet over MPLS, GbE/10GbE, POS)- Flow based L2VPN- Flow based L3VPN

• EPL/EVPL (Ethernet over Ng-SDH, EoS/SDH)• TDM Emulation• New Leased Line (TDM over Ng-SDH, EoS/SDH)• Packet DCS (EoS/SDH)

• Multimedia IP communication

GbE/10GbE

POS(2.5/10G) POS(2.5/10G)

EOS/SDH(2.5/10G)

EOS/SDH(2.5/10G)

IP/MPLS

EoS

IP/MPLS

Flow Mapper

23Proprietary

QSS PositioningQSS Positioning

Target : from Access to Premium IP

Aggregation Device

Aggregation S/W Metro S/W

ServiceSwitch Edge Core

Premium IP Network

NCP

QSS Family

QSR80 QSS120 QSR240 QSS120/350QSR240/700

QSS120/350QSR240/700

• Chassis Type• Powerful ASIC• Flow : few Millions• Jitter/Delay Control• Scalability• Fault Tolerance• Embedded OAM & Protection

• Stackable• Flexible ASIC or FPGA• Flow : less than 10K• Scalability• Fault Tolerance• Embedded OAM & Egress Protection

DSLAM

국내업체에 QSS 요소기술전수

24Proprietary

Network Configuration for QSS-120 Demonstration

Best-EffortService Network

POS(2.5G)

NMSTraffic MonitorNCP

Call Server

L2 Switch (Locus)

L2 Switch (Locus)

Traffic Generator

Congestion Box

Video PhoneGR

Video PhoneGR

VOD (SD)Client-CR

HDTVGR

Gears for MPLSGears for MPLS

STB

VLAN 200 VLAN 100

Video PhoneGR

Video PhoneGR

VOD (SD)Server-CR

MediaServer

For HDTV

Gears for MPLS Gears for MPLS

FTTH

Silver User ( CR Traffic )Bronze User ( AR Traffic )

Premium User ( GR Traffic )

RSVP & MPLS Domain

Gears for BEGears for BE

Video PhoneGR

VOD (SD)Server-AR

VOD (HD)Server-GR

Video PhoneGR

Video PhoneGR

VOD (SD)Client-AR

VOD (HD)Client-GR

Gears for BE Gears for BE STB

Video PhoneGR

Hub for Mgmt.

Traffic Generator

Congestion Box

Customer site-A Customer site-B

25Proprietary

Phase 0 Demo – IT 839 전시(04.12.7)Phase 0 Demo – IT 839 전시(04.12.7)

26Proprietary

QSS Positioning 구성도 (1) QSS Positioning 구성도 (1)

PositioningMetro Transport Network

IP Connection ↔ Microflow

Σ Microflows → SMPLS

TDM 전용회선 → SMPLS

BcN Transport Network

Edge : SMPLS

Core : λ Switch, 초 대용량 라우터

ServiceSwitchMetro

TransportNetworkW

LAN

ADSL

IP VDSL

Ethernet

TDM

BcNTransportNetwork

QSS

참고

27Proprietary

QSS Positioning 구성도 (2)QSS Positioning 구성도 (2)

PABXPCM

CSU/DSU

FLC/SDH

FLC

FLC

Subscriber

FLC/SDH

PCM MUX

FLC

WDCS

Metro Ethernet Metro Ethernet

FLC

1st C.O

PSTN

Switch/Router

PCM

MUX

WDCSFDSL/HSDSL

DSU

FDSL/HSDSL

PCM

WDCS

WDCS

2nd C.O

L/L

PABXV5.2

MSPP-RT

MetroEthernet

MSPP-COTQSS QSS

Needed Upgrade as Needed Upgrade as ““Consolidated SolutionConsolidated Solution””

28Proprietary

Application (3) – Profitable Metro NetworkApplication (3) – Profitable Metro Network

InternetInternet…

G

G

APT(VDSL)

FES

DSLAM

DSLAM

Home

Home

Subscriber

Subscriber

100FX

100TX

100TX

xDSL

APT(Ethernet)

Home

RT

G

Branch Office(Telephone Office)

Metro POP(Regional Office)

QSS120QSS120

xDSL Aggregation Switch

Subscriber Switch

• Marking/Demarking• VLAN+ OAM• Statistics per VLAN+• DHCP Relay

ProvisioningPolicyServer

NCPCall

Server

ESN

BcN/Premium IP

ESN : Edge Service NodeNCP Control

QSR80

QSR240/700QSR240

29Proprietary

맺음말맺음말

미래 정보통신 서비스는 IP 기반 멀티미디어 서비스가 주도

서비스 활성화를 위해 전달망에서의 IP QoS 보장 기술 확보 시급

기술의 Convergence 에 따른 사업모델의 Convergence

기존 라우터들과 차별화된 기술로 세계시장 공략

장비보다는 서비스 레벨의 세계시장 진출에 국내 통신사업자의 공

격적인 마케팅 전략 절실

BCN을 기반으로 하는 Network기반 IT 839 신성장 동력