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Outline
! Introduction! The user demand analysis! The management and security response! The QoS experience and the tools! The 40G IP backbone trial! IPv6 challenges! Conclusion
3
Introduction
! The university campus networks have been
practicing broadband services for a very
long time. This presentation will introduce
the CERNET’s campus broadband services
and discuss the lessens learnt.
4
CERNET Transport Network大�
北北北北京京京京
�州州州州
石家石家石家石家庄庄庄庄
武武武武�
合合合合肥肥肥肥
南南南南京京京京
上上上上海海海海
�沙沙沙沙
南南南南昌昌昌昌 杭杭杭杭
州州州州
广广广广州州州州
福福福福州州州州
成成成成都都都都
昆昆昆昆明明明明
重重重重�
厦�
海海海海口口口口
桂林桂林桂林桂林
沈沈沈沈阳阳阳阳
哈哈哈哈��
天天天天津津津津
�南南南南
南南南南宁宁宁宁
深深深深圳圳圳圳
太太太太原原原原
青青青青�
6
CERNET Backbone (2)
! 18 national Pops are connected via multiple 2.5Gbps DWDM links
! 8 provincial Pops are connected via multiple 155Mbps SDH links
! 38 GigaPops distributed in 36 cities, covering all the provinces in
Mainland China.
! 300 campus networks connect to their nearest Pops via 100Mbps-
1Gbps links.
! 1,500 education and research institutions connected
! 15 million users
! 320 million students/school kids in mainland China
8
CERNET2 Backbone (2)
! 5 10 GPops are connected via 10G DWDM links
! 15 GigaPops are connected via 2.5G links
! 25 GigaPops distributed in 20 cities.
! 100+ campus networks connect to their nearest Pops via 1Gbps links.
! Pure IPv6 service
9
X.25NODE
X.25 NODE
X.25NODE
PAD
PAD
PADIBM ELXSI
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IBM5550
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PAD PAD
1988
TUNET 1988
10
FDDI»·
MB
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CC
C.C.
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FHUB
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NHUB
NHUB
C
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FHUB
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NHUB
1993
TUNET 1993
11
R9
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R8
R2
¼Æ Ëã ÖÐ ÐÄ ¡¢ ¹¤ Îï ϵ µÈ ?15 LANs
Rout e r Swi t c hHUBRn
1 0 0BASE- TXÇå »ª ó ѧ У Ô° Íø( TUne t )
R1
CERNET
¼Æ Ëã »ú ϵ ¡¢ µç ×Ó Ïµ µÈ 1 2 LANs
ÖÐÑëÖ÷Â¥
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DNS NMEmai l
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ͼ Êé ¹Ý
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R3
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µç »ú ϵ µÈ 8 LANs
¾« ÒÇ Ïµ µÈ 8 LANs×Ï ¹â ¼ ÍÅ µÈ
1 0 LANsУ »ú ¹Ø µÈ
1 2 LANs
ͼ Êé ¹Ý µÈ12 LANs
×Ô ¶ » ϵ µÈ 9LANs
ATMTe s t Be d2
ATMTe s t Be d1
ATM½» »» »ú1998
TUNET 1998
12
• • • •• • • •
FDDI
FDDI
FDDI
FDDI
FD D IFD D I
FDD
IFD
DI
CERNET
F D D I
FDD IFDD IFD D I
FD D I
FDD
IFD
DI
W W W DNS 1 D NS 2 M ail M a ils
DH CP 1 D H CP 2 FT P CA D B
ͼ Êé ¹Ý
¹« ¹² ½Ì ÊÒ
¼Æ
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16ºÅ Â¥ µØ Çø
GSR GSR GSR GSR
Íø ¹Ø
»ª Òµ ó ÏÃ
Öй¤ ×Ö Ìü
ͼ Êé ¹ÝУ Ô° ¶« Çø
FDD IFDD I
FDD IFDD I
FDD
IFD
DI
9 0 00Co re B ui lde r 9 0 00
¶« Ö÷ Â¥Î÷ Ö÷ Â¥9003 µç »° ÊÒ
Co re B ui lde r 9 0 00Co re B ui lde r
1#Â¥ 2#Â¥ ÐÂ Õ«
• • • •• • • •5#Â¥ 12#Â¥ 13#Â¥ 14#Â¥ 34#Â¥
• • • •• • • •
Çå »ª ó ѧ У Ô° Íø TUNET
2002
TUNET 2002
14
THUNET Facts
THUtotal student num 30000border bandwidth (M) 2000local bandwidth (M) 70000IP address 65536
border bandwidth per head (M) 0. 07local bandwidth per head (M) 2. 33address per head 2. 18
15
Design Considerations
! High performance
! Low operation cost
! Effective management
! Quick emergence response
17
Technical Design! Packet forwarding
– Routing – switching
! Network management– throughput/performance
! User management– Gateway– PPPoE– 802.1x– VALAN
20
Chinese University Connectivity Demand
! 16 Million students enrolled in 2003 universities and institutes located
in more than 260 cities in Mainland China in year 2002.
! The average number of enrollment per university/institute is about
8,000 students.
! If 1 Mbps connectivity is required per student, an average sized
campus network will need about 8 Gbps of aggregated bandwidth.
! When 80 vs. 20 rule applied, the CERNET backbone should provide 4
Tbps aggregated bandwidth reaching more than 260 cities.
! For one IP address per student assignment, 1 /8 space is needed.
22
IPv6 Transition! Hosts
– FreeBSD/Linux/UNIX– WindowsXP
! Layer 2 Switch–
! Layer 3 Switch/Router– !!!
! Access Server– !!!
! DNS– !!!
! Applications– !!!