NETMANIAS WHITE PAPER
Riverstone\'s Optical Ethernet MAN Solution 분석 by 손장우
10/25/2000　
손장우

Internet Big Picture
User
localized Contents
CO ISP POP

Area
Function
Core
Tech.

Transport
Network

ESP (Ethernet Service Provider)


User
localized Contents
CO ISP POP

Area
Function
Core
Tech.

Transport
Network

ESP: Telseon’s Architecture

10/100
(/1G)

Metro Edge Metro Core
Category 5
cabling

ISP POP
Host or Service Access Core
Dark fiber
CO
Router Interface Unit Switch Switch
of Level3
1G
SMF/MMF
Fiber or DWDM
Fully-meshed Layer 3 switch, interconnected via CWDM equipment
To the Internet
(Verio)
Customer Provisioning
CP
Brows
CO
& Reports Server
Co-location
ASP

Ethernet switch
(Riverstone)databackup
Riverstone의 Optical Ethernet MAN solution



RS’s Optical Ethernet MAN
. Solution: High Speed Business Internet Access and secure VPN
. 100 Mbps / tenant
. QoS, Customer Billing, BOD(Bandwidth On Demand)
. Metro access platform: RS3000, RS8000
. Metro aggregation platform: RS8600, RS32000 Ethernet and MPLS
. Ethernet: cost, bandwidth rich
. MPLS: control over L2 connectionless network
. MPLS VPN
. MPLS QOS Core Technologies
. MPLS (VPN, QoS, ASP, CSP, DBSP)
. HRL (Hardware Rate Limiting)
. Multi-Field Packet Classification
. eQoS (4 Priority queueing: WRED, SPQ, WFQ)
. Billing (Customer Billing)

Riverstone의 Optical Ethernet MAN solution

MTU
Metro Core
ISP POP ASP network 32 Ethernet (E/FE) RS3000 Long-haul GE (70Km) /ATM/POS/WDM Long-haul GE (70Km)
70Km /T1/T3 WDM/10GbE/
ATM/POS/TDM MTU
RS8600 RS32000 Ethernet
RS8000 ISP
Metro access Metro aggregation ASP
CSP
Riverstone의 Optical Ethernet MAN solution


Metro
Aggregation
Platform:
RS32000

Features
. up to 128Gbps nonblocking SF
. up to 90 Mpps forwarding rate
. IP routing protocol/ MPLS (LSR)
. HRL (H/W rate limiting), QoS

Interface
. 960 FE ports, 240 GE ports
. 60 POS OC48c ports
. 240 T1/E1, 120 T3/E3 ports
. ATM
. WDM/10GbE

Cost
System = 120 GbE ports fully configured
→ < $ 2,000 / GbE port
Cf) Cisco GSR POS

→ $ 29,000 / OC12 (622Mbps)
→ $ 97,000 / OC 48 (2.5 Gbps)

Riverstone의 Optical Ethernet MAN solution

Metro Access Platform: RS 3000 (CPE)

Features
. 8 Gbps nonblocking SF
. 9.5 Mpps forwarding rate
. MPLS LER
. HRL (H/W rate limiting), QoS
. NAT

Interface
. 32 E/FE ports (to customers)
. 2 expansion module slot -GE (max 70km) -POS, ATM, WDM
. 1 Multi-rate WAN module (CSU, DSU내장 )
Cost: $ 8,995

Riverstone의 Optical Ethernet MAN solution

MTU
Metro Core

ISP POP
Metro aggregation
ASP network
32
Ethernet
Telseon
(E/FE)
RS3000
Long-haul GE (70Km)
/ATM/POS/WDM Long-haul GE (70Km)
70Km /T1/T3 WDM/10GbE/
ATM/POS/TDM MTU
RS8600 RS32000
ISP
ASP

Ethernet
CSP RS8000
UrbanMedia (09/25/00)
Metro access Telseon (09/18/00)
IntelliSpace (09/18/00)

Core Technologies (RS3000)


Flow Classification
Classification Rate Limiting

Pre  src MAC  dst MAC  Type  TOS  Protocol ID  src IP  dst IP  src port number  dst port number User data  CRC  
Multi-Field Flow Classification


802.1p/Q

8B 6B 6B 2B 1B 1B 4B4B2B 2B 4B
Ethernet IP TDP/UDP
Layer2 Layer3/4 Layer4/7

UpNETMANIAS CONFIDENTIAL
Customer  5 Mbps  MAN port  
A  5 MbpDown  GbE  Customer  5 Mbps  
B  15 Mbps  Customer  15 Mbps  
C  15 Mbps  RS3000  

HRL (H/W Rate Limiting)

PRL (Port Rate Limiting)
Customer에게 물리적인 port는 FE이나 GE port를주고 customer가사를주고가사용가능한 BW를 임의로 조절해줄 수있는 기능
(H/W: rate limiting기능을 수있는H/W로 구현함으로써 performance degradation이 없음을 강조)
Physical port speed 100Mbps
HRL (H/W Rate Limiting)

ARL (Aggregate Rate Limiting)

. 특정 customer로부터 온 (그 customer로갈 ) aggregate traffic의 rate 을제한 (보장 ) 로갈을제한
. 특정 customer의 트래픽 중특정 응용의 aggregate traffic의 rate을 중특정제한 (보장 ) (예 , 미디어링크로부터유입되는 VoIP aggregate traffic= 1Mbps로제한 /보장해줌 )로제한

Shaped Traffics from Medialincs Traffics from
(Total: 10Mbps Pre  src MAC  dst MAC  Type  TOS  Protocol ID  src IP  dst IP  src port number  dst port number  User data  CRC  HRL (H/W Rate Limiting) 얻을 수 있는 효과 VCustomer 별/application 별/flow별로 BW 할당 및 보장과 Billing이가능

VAsymmetric allocation: Internet access 의특성 을반영 (Up: 1Mbps, Down: 10Mbps)

HRL (H/W Rate Limiting)

어떻게 구현구현 하나 ?
⇒Hardware Credit Bucket Scheme Credit count: 현재 credit의수 Replenish rate (ρ): credit을 refill하는 rate Packet 도착 Credit이 있으면: Packet pass
Decrease credit count (-1)
없으면: Drop, Reprioritizing (rewrite TOS)

Up
Down
Key parameters ρ~dReplenish rate σ~dcredit pool size
→ Riverstone proprietary algorithm (not announced)

eQoS

MLPS in MAN

MTU VLAN 2
ISP POP
ASP network
MPLS VPN
Ethernet
(VPN ID↔
LSP)
VLAN 1
RS3000
GE, POS
MTU
RS8600 RS32000
GE, POS
Ethernet
LSP #3
BW: 20Mbps

RS8000
QoS: premium ISP
Metro access Metro aggregation ASP
CSP

Ethernet 기반 MAN의장점


SONETSDH 계층(광전송장비)이 필요없다 .
→ 망구축
비용 절감 (1/4~1/6)
Ethernet 기술의 cost < 1/10 of SONET or ATM
사용자(Business, Residential) 당대역폭 :
1Mbps~10Mbps~1000Mbps 로 확장 가능하며 ,
0.1Mbps 나 1Mbps 단위로할당가능 (기존 전용회 선: Fractional T1/E1->T1/E1->N*T1/E1-> T3/E3­>OC3)

Ethernet backbone 망용량확장방안 : 10Gbps, CWDM, DWDM