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Carrier Ethernet 기반의 Multi-Layer Network Architecture
Multi-Layer Network Architecture based-on Carrier Ethernet
December 03, 2008 | By Netmanias (tech@netmanias.com)
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손장우 (son@netmanias.com)

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Transcript
2008년 12월 3일
손장우
넷매니아즈/㈜NMC컨설팅그룹
www.netmanias.com
son@netmanias.com
02-3444-5747, 016-460-5747


Contents


새로운 망 구조의 대한 Needs

IP Traffic (All Traffic in IP)의지속적인증가


IP/MPLS Network (Capex/Opex)의고비용성



New Converged Network Architectures (앞으로?)

Carrier Ethernet 기반의Multi-Layer Network Architecture




LAN Ethernet


Metro Ethernet


Carrier Ethernet


10-Year Network Trends

PSTN

CATV

IP

Public
Internet

Internet

Voice

TV

SO

NSP

MPLS
L3 VPN

PP

ATM

SDH

Branch
Offices

TDM

MSPP

Ethernet

MPLS

Ethernet (L2/L3)

PTSN

KORNET

Premium

Enterprise Internet Access (L3)

SDH/MSPP/OXC

ATM

Premium

Single
ALL-Service/
Purpose
Network

Internet

Voice

TV

2G

3G

WiMAX

Residential

Enterprise

Mobile

Residential

Enterprise

Mobile

MPLS PW

TPS Network

IP/MPLS

Multiple, SINGLE Service/Purpose Network

PAST
CURRENT

CURRENT

Internet

VPN

2G BTS

3G NodeB

WiMAX RAS

BSC

RNC

ACR

4G eNodeB

SAE

MSPP (TDM, ATM, Ethernet)

2G BTS

3G NodeB

WiMAX RAS

4G eNodeB

Internet

VPN

PP/HE

FUTURE
CURRENT

Single ALL-Service/Purpose Network

Multiple, MULTI-Service/Purpose Network

Residential

Enterprise

Mobile

PP/HE

Example: KT

MSPP

Another Alternatives ?

Metro Ethernet
IP/MPLS Backbone

Metro Ethernet
IP/MPLS Backbone
TDM/MSPP/OXC


IP/MPLS

Metro POP25

중계 노드 12

중계 노드 7

nPE/ER

CO1

Metro POP1

BRAS

CO8

VoD

Home

Enterprise

uPE

PE-Agg

CO2

BR

중계 노드 6

Metro POP 24

P/CR

중계 노드 1

Metro POP48

IP/MPLS/Ethernet
Backhaul

IP/MPLS/Ethernet
Backhaul

Mobile

Public Internet

IPTV/IMS Farm

Home


Mobile

Enterprise

IP/MPLS Core

IP/MPLS Edge

Residential Internet

Residential Onnet VoIP

Residential IPTV (Multicast)

Residential VoD

Residential Onnet P2P

Enterprise Internet

Enterprise VPN: L3 VPN (TPS Service VPN, Enterprise L3 VPN)

Mobile Backhaul

Enterprise VPN: L2 VPN (p2p: VPWS/EoMPLS)

Enterprise VPN: L2 VPN (MP: VPLS)


MPLS10-Year Old Technology.성숙된기술, 표준기반.유선Broadband, 유선Enterprise, Mobile에모두적용되고있음.원래Backbone기술이나최근에는Metro에도적용되고있음.다양한서비스를만들수있음.기술적으로는Fast Recovery, Traffic Engineering, OAM을제공


IP Traffic의 지속적인 증가

Metro POP25

중계 노드 12

중계 노드 7

nPE/ER

CO1

Metro POP1

BRAS

CO8

VoD

DSLAM/OLT

Enterprise

uPE

PE-Agg

CO2

BR

H/E (H/E VoD)

중계 노드 6

Metro POP 24

P/CR

중계 노드 1

Metro POP48

IP/MPLS Core

IP/MPLS Edge

IP/MPLS/Ethernet
Backhaul

IP/MPLS/Ethernet
Backhaul



통신사업자 측면

Metro POP25

중계 노드 12

중계 노드 7

nPE/ER

CO1

Metro POP1

BRAS

CO8

VoD

Home

Enterprise

uPE

PE-Agg

CO2

BR

중계 노드 6

Metro POP 24

P/CR

중계 노드 1

Metro POP48

IP/MPLS/Ethernet
Backhaul

IP/MPLS/Ethernet
Backhaul

Mobile

Public Internet

IPTV/IMS Farm

Home


Mobile

Enterprise

IP/MPLS Core

IP/MPLS Edge



통신사업자 측면 (CAPEX/OPEX 압박)

Metro POP25

중계 노드 12

중계 노드 7

nPE/ER

CO1

Metro POP1

BRAS

CO8

VoD

Home

Enterprise

uPE

PE-Agg

CO2

BR

중계 노드 6

Metro POP 24

P/CR

중계 노드 1

Metro POP48

IP/MPLS/Ethernet
Backhaul

IP/MPLS/Ethernet
Backhaul

Mobile

Public Internet

IPTV/IMS Farm

Home


Mobile

Enterprise

IP/MPLS Core

IP/MPLS Edge



벤더 측면

Metro POP25

중계 노드 12

중계 노드 7

nPE/ER

CO1

Metro POP1

BRAS

CO8

VoD

DSLAM/OLT

Enterprise

uPE

PE-Agg

CO2

BR

H/E (H/E VoD)

중계 노드 6

Metro POP 24

P/CR

중계 노드 1

Metro POP48

IP/MPLS Core

IP/MPLS Edge

IP/MPLS/Ethernet
Backhaul

IP/MPLS/Ethernet
Backhaul


IP/MPLS Core

IP/MPLS Edge

MPLS/Ethernet Backhaul


정리 및 Problem Description


Multi, Single Service Network에서패킷기반의Single, All Services Network로는이미진화중임(IP Transformation, All IP, NGN,…)


단일Converged Network이Residential TPS, Enterprise, Mobile Traffic을전달함.


현재의단일Converged Network 구조는IP/MPLS over DWDM임.



IP Traffic은지속적으로증가중(Broadband Subscriber 증가, ADSL/VDSL/FTTH, Youtube, IPTV/VoD, VoIP, Mobile(3G/4G)의IP Traffic,…)


IP Router Interface $ >> L2 Switch Interface $



통신사업자: 고가의대용량라우터를계속증설해나가야함. BW (Access line, 실사용트래픽량)가올라가도서비스요금은그대로임.


벤더: 시스코, 쥬니퍼는좋다.



Cost-efficient, Robustand Scalable한새로운망구조가필요함.



Adobe Systems

Internet

Adobe Systems

Internet


IPTV/VOD


VoIP


Enterprise


Mobile

?

$$$$$$


대안 구조에 대한 연구

Project
Key Research Objectives
Company
Research Duration

ETNA (Ethernet Transport Network Architecture)
http://www.ict- etna.eu
ETNA aims to analyze, design and validate future metro and core networks based on low cost and secured Ethernet technology that will serve as a basic transport layer of future communication networks.
ETNA European consortium: BT, NSN, Ethos Networks 등
01/01/2008 . 12/31/2009 (2 years, €3.4 million)

EIBONE (Efficient Integrated Backbone)
http://www.bmbf.de/ de/6103.php
Cost-efficient, flexible and robust core and metro network

Scalable and secure network architecture for the future Internet using optical technologies and Layer 2

Hardware and software prototypes for demonstration and filed trials


DT (T-com), NSN, ALU, Ericsson, 등 15개 회사, 연구소, 대학
09/2005-08/2008 (3 years)

IST Nobel Phase 2
http://www.ist- nobel.org/
Evolution of the data plane technology in order to reach an \"optimum techno-economic balance\" between optical/electrical and circuit/packet routing and switching

Evolution of the network control plane towards an unified control plane that is able of improving the seamless end-to-end network service capabilities in a flexible and scalable way.


Telecom Italia, Telefonica, DT, FT, NSN, ALU, IBBT, AGH, Ericsson
03/01/2006 . 02/29/2008 (2 years, €12.11 million)



ETNA Project








EIBONE Project





유럽의 Research Project로 9개 회사와 2개 연구소, 4개 대학이 참여하여 2005년 9월에서 2008년 8월 까지 3년간 수행됨.

EIBONE Project에서 제시한 Multi-Layer Transport Network Architecture



모든 트래픽이 모든 라우터를 통해 처리되어야 하나?



Concept of Multi-Layer Architecture

nPE

BRAS

Center
Router

Residential Internet

Onnet VoIP

IPTV (Multicast)

PoP VoD

H/E VoD

DSLAM
/OLT

BR

Onnet P2P

중계라우터

Center
Router

중계라우터

nPE

BRAS

PE-Agg

uPE

PE-Agg

uPE

DSLAM
/OLT

H/E Router

VoD Router

Enterprise Internet

Enterprise VPN (L2/L3)

Enterprise Internet

EnterpriseVPN (L2/L3)

BRAS

BRAS

H/E Router

VoD Router

PE/ER

PE/ER

PE/ER

PE/ER

BR

BR

Residential Internet

Onnet VoIP

IPTV (Multicast)

PoP VoD

H/E VoD

Onnet P2P

IP/MPLS Architecture

CE기반 Multi-Layer Architecture:
1) L3 Cost >> L2 Cost   2) L2 CE으로 망을 구축하고 필요한 부분만 Router를 도입 (Switch when you can, Route when you must)



Traffic Path

CO1

지역노드/Metro POP 21

PE/ER

BRAS

CO8

VoD

MGW

DSLAM/OLT

CSA

Enterprise

Metro SW

AGG SW

수용국/CO

CO SW


BR

H/E Router (H/E VoD)

얘 용도는 SP 가입자간 VoIP와 P2P

CO1

지역노드/Metro POP 1

PE/ER

BRAS

CO8

VoD

MGW

DSLAM/OLT

CSA

Enterprise

Metro SW

중계노드
Regional
Node 1

AGG SW

PE/ER
1. MPLS L3 VoIP VPN PE
2. MPLS L3 VoD VPN PE
2. Enterprise Internet ER

수용국/CO

CO SW

지역노드/Metro POP 4

지역노드/Metro POP 24

중계노드
Regional
Node 6

CO1

지역노드/Metro POP 25

PE/ER

BRAS

CO8

VoD

MGW

DSLAM/OLT

CSA

Enterprise

Metro SW

AGG SW

수용국/CO

CO SW


Residential Internet

Onnet P2P

CO1

지역노드/Metro POP 45

PE/ER

BRAS

CO8

VoD

MGW

DSLAM/OLT

CSA

Enterprise

Metro SW

AGG SW

수용국/CO

CO SW


Enterprise Internet

Enterprise VPN

Onnet VoIP

중계노드
Regional
Node 7

중계노드
Regional
Node 12

PoP VoD

H/E VoD

Residential Internet

Onnet VoIP

Onnet P2P

H/E VoD

PoP VoD

Enterprise Internet

Enterprise VPN

지역노드/Metro POP 48



E2E Physical Network Topology

Residential

Mobile

Enterprise

Residential

Mobile

Enterprise


Last Mile
Access

Metro
Network

Regional
Network

Backbone
Network

CO

POP

Regional
Node

Center
Node

Regional
Node

POP

CO

Last Mile
Access

Metro
Network

Regional
Network



ATM/SONET Metro + IP/ATM/SONET Backbone

Residential

Mobile

Enterprise

Public Internet

IP (Routing)

WDM (BW)

ATM-BRAS

CO (384)

POP(48)

RN(12)

ER

POTS

ATM (Cell Switching, Traffic Engineering)

SONET/SDH (Protection & OAM)

Residential

Mobile

Enterprise

ATM-BRAS

ER

Full-Mesh (IP over ATM)

POTS


PSTN

Mobile

Enterprise

IP over ATM

IP over ATM


ATM/SONET Metro + IP/SONET Backbone

Residential

Mobile

Enterprise

WDM

CO (384)

POTS

SONET/SDH

Residential

Mobile

Enterprise

POTS


PSTN

Mobile

Enterprise

ATM Backhaul

Public Internet

IP/MPLS (Routing)

POP(48)

CN(2)

Headend/IMS

PE/ER

BRAS

BRAS

RN(12)

PE/ER

IP over SONET (POS)M

IP over SONET (POS)M


Metro Ethernet + IP/MPLS Core

Public Internet

IP/MPLS (Routing)
IP: Routing, Convergence
MPLS: TE, Fast Recovery, Various Services (L3 VPN, L2 VPN (P2P, MP), MPLS OAM

Optical Transport
(WDM)

BRAS

POP(48)

RN(12)

CN(2)

Headend/IMS

PE/ER

Residential

Mobile

Enterprise

Residential

Mobile

Enterprise

Metro Ethernet

CO (384)

POP(48)

IP over DWDM

IP over DWDM

왜 Ethernet이 싼가?
SONET, ATM은 Enterprise에 없다. Carrier Network에만 있다.
(Enterprise Market: Huge Volume and Price Pressure)

Simplicity & Superior Cost Structure of Ethernet

OAM 부재
TE 부재
Scalability (MAC learning, VPN ID)
STP/RSTP

Metro Ethernet

IP/MPLS
Complex: IGP, IGP-TE, LDP, RSVP-TE, T-LDP, MP-iBGP
High Cost


IP/MPLS

Residential

Mobile

Enterprise

Residential

Mobile

Enterprise

Public Internet

IP/MPLS
IP: Routing
MPLS: Traffic Engineering, Protection

Optical Transport
(WDM)

BRAS

CO (384)

POP(48)

RN(12)

CN(2)

Headend/IMS

PE/ER

Routing 될 필요가 없는 트래픽 (BR로 가서 Public Internet으로 나가는 Transit Traffic(RN-Router, CN-Router를 통 과할 필요없음), Enterprise L2 VPN Traffic, DSLAM과 BRAS간 Traffic, RAS와 ACR간 Traffic


Carrier Ethernet

Residential

Mobile

Enterprise

Residential

Mobile

Enterprise

Public Internet

IP/MPLS (Routing)

Carrier Ethernet Transport Network
(Packet switching, Protection Switching,
Traffic Engineering, E2E Ethernet OAM)

Optical Transport
(WDM)

BRAS
MPLS L3 VPN PE (VoIP)
Enterprise ER

CO (384)

POP(48)

RN(12)

CN(2)

Headend/IMS


Carrier Ethernet

Carrier Ethernet Transport Network
(Packet switching, Protection Switching,
Traffic Engineering, E2E Ethernet OAM)

Residential

Mobile

Enterprise

Residential

Mobile

Enterprise

Public Internet

IP/MPLS (Routing)

Optical Transport
(WDM)

BRAS
MPLS L3 VPN PE (VoIP)
Enterprise ER

CO (384)

POP(48)

RN(12)

CN(2)

Headend/IMS

BRAS

VoD


Carrier Ethernet

Carrier Ethernet Transport Network
(Packet switching, Protection Switching,
Traffic Engineering, E2E Ethernet OAM)

Residential

Mobile

Enterprise

Residential

Mobile

Enterprise

Public Internet

IP/MPLS (Routing)

Optical Transport
(WDM)

BRAS
MPLS L3 VPN PE (VoIP)
Enterprise ER

CO (384)

POP(48)

RN(12)

CN(2)

Headend/IMS


POTS (Packet Optical Transport System)

Residential

Mobile

Enterprise

Residential

Mobile

Enterprise

Public Internet

IP/MPLS (Routing)

Metro POTS

Optical Transport
(WDM)

BRAS
MPLS L3 VPN PE (VoIP)
Enterprise ER

CO (384)

POP(48)

RN(12)

CN(2)

Headend/IMS

OXC+CE


망구축 비용 비교: Assumption

Node Hierarchy
# of Nodes
Subscribers per Node
Comment

Center Node
2 CNs
Total 3,840,000 subscribers

중계 노드 (Regional Node)
12 RNs
320,000 subscribers/RN

지역 노드 (Metro PoP)
48 PoPs (=12[RN]x4[PoP /RN])
80,000 subscribers/PoP
4 PoP/Regional Node
BRAS, ACR, PE가위치함.
VoD Server, MGW가위치함.

수용국 (CO)
384 COs (=48[PoP]x8[CO /PoP])
10,000 subscribers /CO
8 CO/PoP


Node Hierarchy
Dimensioning
Traffic per CO
Traffic per PoP

Residential Internet
Average BW per subscriber = 120Kbps
1.2 Gbps
(=120Kbps*104)
9.6 Gbps (=1.2Gbpsx8)

VoD
4Mbps, 10% Concurrency
4 Gbps
(=4Mbpsx104x0.1)
32 Gbps (=4Gbpsx8)

IP-TV
4Mbps, 200 CHs
800 Mbps
(=4Mbpsx200)
800 Mbps (=4Mbpsx200)

Total Required Capacity
6 Gbps
PoP Downlink방향: 42.4 Gbps(=9.6G+32G+800M)
PoP Uplink 방향:
16.8Gbps (=9.6G+6.4G+800M)


Traffic per CO
Traffic per PoP

Total enterprise traffic
Residential TPS traffic:Enterprise traffic=3:1
1.5 Gbps
12Gbps (=1.5Gx8)

Enterprise Internet access traffic
50%
0.75Gbps
6Gbps

Enterprise L2 VPN traffic
50%
0.75Gbps
6Gbps


Residential

Mobile

Enterprise

Residential

Mobile

Enterprise


Last Mile
Access

Metro
Network

Regional
Network

Backbone
Network

CO
(384)

POP
(48)

Regional
Node (12)

Center
Node (2)

Regional
Node

POP

CO

Last Mile
Access

Metro
Network

Regional
Network


수용국

지역노드

중계노드

센터노드



망 구축 비용 비교: CAPEX 비교 (price ratio = 0.6)




실제 시장가



Summary

Multi, Single Service Network에서 패킷 기반의 Single, All Services Network로는 이미 진화중임 (IP Transformation, All IP, NGN,…)
단일 Converged Network이 Residential TPS, Enterprise, Mobile Traffic을 전달함.
현재의 단일 Converged Network 구조는 IP/MPLS over DWDM임.
IP Traffic은 지속적으로 증가 중 (Broadband Subscriber 증가, ADSL/VDSL/FHHT, Youtube, IPTV/VoD, Mobile IP Traffic,…)
IP Router Interface $ >> L2 Switch Interface $
통신 사업자: 고가의 대용량 라우터를 계속 증설해 나가야 함. BW (Access line, 실 사용 트래픽량)가 올라가도 서비스 요금은 그대로임.
벤더: 시스코, 쥬니퍼는 좋다.
Cost-efficient (Low cost), Robust and Scalable한 새로운망구조가 필요함.
Carrier Ethernet 기반의 Multi-Layer Network Architecture가 대안으로 제시되고 있음.

Carrier Ethernet (PBT, MPLS-TP): Packet Multiplexing/Switching Layer, OAM, Protection, Service Separation, QoS


망내필요한Router 수와용량을최소화함.


전체망구축비용을현재IP/MPLS 망구축비용의40% 정도(가변적일수있음)만소요됨.


이슈1) 새로운망구조라는점: 기존투자, 기존망구조에익숙등이단기적으로는상용망적용에문제로작용


이슈2) Carrier Ethernet (PBT, MPLS-TP) 표준완성, Carrier Ethernet 기술/장비/망에대한검증, 벤더간장비IOT 검증



Adobe Systems

Internet

Adobe Systems

Internet


IPTV/VOD


VoIP


Enterprise


Mobile

$$$$$$


Adobe Systems






IP/MPLS Router

IP/MPLS Router

L2 CE Switch

1000

100

300

400=300+100
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