1. BEIJING-LCG Network Yan Xiaofei yanxf@ihep.ac.cn

2. Network Services Largest campus network and largest bandwidth for an institute in CAS Largest campus network and largest bandwidth for an institute in CAS 10G backbone 10G backbone IPv4/IPv6 dual-stack IPv4/IPv6 dual-stack Wireless covered (>250 APs) Wireless covered (>250 APs) Exchange 4PB data/year Exchange 4PB data/year Email/web/collaborative work/… services Email/web/collaborative work/… services >3000 users >3000 users Computer Center,IHEP

3. Local Network Topology Computer Center,IHEP

4. Key Features for the Topology Double Core switches & Firewalls – High Capability, Stability, Easy Management… Better Backbone Bandwidth – 160Gbps(4X40Gbps) for Layer2 Switches – 2X10Gbps for Storage Nodes Clear Zones – Internal: Computing/Storage/AFS/DNS/Monitoring – DMZ: Public Servers/Login Nodes/… – Internet: Network Performance Measurement nodes Two networks – Data Network High Stability & Capability – Management Network High Stability Computer Center,IHEP

5. International and Domestic Links Computer Center,IHEP

6. IPv6@IHEP-Deployment Internet bandwidth 10Gbps to CSTnet IPv6 network devices ~150 switches ~300 AP IP address allocation SLAAC Network monitoring Cacti / Nagios with IPv6 patch Network security IPv6 ACL(Linux) Anything out / Nothing in Computer Center,IHEP

7. SDN: Software Defined Network Why? Massive data sharing and exchanging among HEP experiments collaborating sites Virtualization and Scaling-up of computing and storage resources require more flexible and automatic network Easier control over network facility and infrastructure IPv4 performance differences among the collaborating sites Goals A Private Virtual Network across Chinese HEP Experiment collaborating sites Based on SDN architecture An intelligent data transfer network route selection algorithm Based on IPV6 among Chinese collaborating sites, but transparent to IPV4 applications Computer Center,IHEP

8. SDN@IHEP Components – End user network – Backbone network （ IPv6 ） – L2VPN gateway – Openflow switch – Control center Participants – IHEP/SDU/SJTU – CSTNet/CERNet – Ruijie networks Computer Center,IHEP

9. Link IPV4 BD （ Mbps ） IPV6 BD （ Mbps ） Tunnel+SDN BD （ Mbps ） IHEP→SJTU31.22665.00448.00 SJTU→IHEP28.60380.00127.00 IHEP→SDU5.90117.3168.90 SDU→IHEP3.1512.606.23 SDU→SJTU3.5166.4039.60 SJTU→SDU3.0675.2340.20 SDN@IHEP -Performance Link IPV4 Latency （ ms ） IPV6 Latency （ ms ） Tunnel+SDN Latency （ ms ） IHEP→SJTU31.2036.7838.17 SJTU→IHEP28.6736.8638.31 IHEP→SDU83.0049.4956.33 SDU→IHEP89.3249.5457.02 SDU→SJTU187.52101.69109.40 SJTU→SDU189.3799.74112.21 Compare Network BandWidth Network Latency The performance is unstable, caused by the IPv6 network load status Computer Center,IHEP

10. International and Domestic Links Computer Center,IHEP

12. Experiment network traffic monitor (1) Computer Center,IHEP

13. Experiment network traffic monitor (2) Computer Center,IHEP

14. Thanks