文档介绍：面向未来的中国教育和科研计算机网
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的发展现状
我国第一个全国性计算机互联网络(1994),目前我国第二大计算机互联网
,国际带宽800M以上;地区网155Mbps;300多个高校具有100M以上的接入速度
与电信运营商的国内互联带宽达5Gbps
国家网络中心、地区网络中心和省主节点分布在全国36个城市的38所高校,通达全国200多个城市
联网单位超过1300个,大学800多个;网络用户达1500万人
2001年开始,主干网的运营和技术服务
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的网络结构
国家主干网
地区主干网
地区主干网
省市教育科研网
省市教育科研网
校园网
校园网
校园网
校园网
校园网
校园网
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高速传输网
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主干网
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General trends within NRENs
Progressive move to more direct use of fibre
Provisioning using SDH/ or Wavelengths
Move towards longer term planning horizons
15-20 year fibre leases and self provisioning
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USA
work (2 backbone)
10Gbps backbone in production 2003
National Lambda Rail (NLR)
Developing a national work for research and experimental use
Dark fibre is procured
Use over WDM
IPv6 is adopted
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GÉANT
Connecting 30 NRENs across Europe
Jointly funded by NRENs and EC
10Gbps capacity, using mainly Juniper routers
Platform for development and deployment of advanced services (QoS, IPv6, MPLS)
Global research connectivity
peering with Abilene, (USA) , 4 (Canada), (Japan)
inter-regional connectivity: ALICE(Latin America), TEIN(Asia/Pacific), EUMEDCONNECT(North Africa)
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5 Infrastructure Consideration
Access to fibre is more cost effective over 10 years
Allows self-provisioning of multiple services
Offers more flexible management on the same infrastructure
Provides scalable bandwidth at controllable cost
Improved resilience as fibre routes known
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5 overall architecture
flexible transmission platform
IP work
special purpose
bandwidth
test- bed(s)
test- bed(s)
commodity use
e-Science
network R&D
service development
requirements to be served
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