Upload
doantram
View
223
Download
2
Embed Size (px)
Citation preview
Flow-based Managed IP Solution -QSSFlow-based Managed IP Solution -QSS
BCN core 네트워킹 QoS 보장 기술
2005.1.27
한국전자통신연구원
광대역통합망연구단
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
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