1. CERNET2’s IPv4 over IPv6 Requirement (draft)
Xing Li
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2. Outline CERNET2 Briefing CERNET2’s IPv4 over IPv6 requirement
Configurations
Summary

3. CERNET2 Briefing CERNET2 is the largest backbone of CNGI project
CERNET2 is running on top of CERNET Transport network
CERNET2 is a “pure IPv6” backbone
The users of CERNET2 require high performance IPv4 applications

4. CNGI Backbones ChinaTelecom CERNET CNC/CST ChinaMobile Unicom
XinJiang
XiZang 兰州
NeiMengGu
NingXia 西安
ShanXi
HeBei 郑州 武汉 南京 合肥 上海
YunNan
GuiZhou 长沙
JiangXi 厦门
GuangXi
HaiNan 长春
JiLin 大连 台湾 深圳 成都
QingHai 济南 重庆
CERNET
ChinaTelecom
CNC/CST
ChinaMobile
Unicom 杭州 福州 沈阳 青岛 天津 香港
HeiLongJiang
LiaoNing 北京
ShanDong
JiangSu
ZheJiang
FuJian
GuangDong
HuNan
HuBei
HeNan
AnHui
ShaanXi
GanSu
SiChuan
ChinaRail 昆明 广州

5. CERNET Transport Network大连 北京 郑州
石家庄 武汉 合肥 南京 上海 长沙 南昌 杭州 广州 福州 成都 昆明 重庆 厦门 海口 桂林 沈阳
哈尔滨 天津 济南 南宁 深圳 太原 青岛 BJ
zhz XA CD WH GZ
xmn
hzh SH NJ
hef
dln SY
chc
hrb
chq
chs
tjn
jnn
lzh

6. CERNET2 IPv6 Technical Specification
25 Pops in 20 cities linked via 2.5Gbps to 10 Gbps trunks
IPv6 only Backbone
AS23910
2001:DA8::/32
IGP - OSPFv3
EGP - BGP4+ peering with
25 regional Pops
5 CNGI backbones
CERNET IPv6, CJ-IPv6, NSFCNET, 863-testbed, 3Tnet, etc
100+ access networks

7. CERNET2 Topology

8. CERNET2 Peering

9. CERNET2’s IPv4 over IPv6 App. Requirement
High Throughput Video
Multicast Video

10. CERNET2’s Vision IPv4 over IPv6 may help
Built and/or upgrade a backbone without worrying the limited IPv4 address, have a better performance-to-cost ratio and in a “politically correct” manner
Support existing IPv4 access networks
Support existing IPv4 applications
And it may help for the transition from IPv4 to IPv6 in a cost effective, incremental and seamless fashion

11. Configuration (1) Only BJ, SH and GZ provide IPv4 service
Other nodes are IPv6 only
Allow manual configuration
Must support unicast and multicast
Global IPv4 Internet

12. Configuration (2) All Pops provide IPv4 service BJ GZ SH hzh xmn WH NJ
hrf
jnn SY
dln
chc
hrb
zhz XA CD
chq
lzh
Prefer auto-configuration
Must support unicast and multicast
chs
tjn
Global IPv4 Internet

13. IPv4 static or eBGP peering
Access Network’s View
CERNET2 Backbone
edge
IPv4 Access
IPv6 Access
IPv4 static or eBGP peering
Encapsulation and Setup
Same as
a dual-stack
backbone
Pure IPv6
LRW

14. Summary IPv4 over IPv6 service should support
The IPv4 access network should behave as if it is connected to a IPv4 or dual-stack backbone
It should support both IPv4 unicast and multicast
Initial requirement is inside an AS domain, but if possible, cross AS’s mechanism is desirable
Encapsulation and control protocol includes
Encapsulation type
End point setup
MTU
Management requires
MIB