Wide-Area Networking at SLAC. Warren Matthews and Les Cottrell (SCS Network Group) Presented at SLAC, April
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1 Wide-Area Networking at SLAC Warren Matthews and Les Cottrell (SCS Network Group) Presented at SLAC, April
2 Overview SLAC s Connections to WANs Utilization End-to-end Performance The Future Note: LANs, MANs, SANs are not discussed
3 Why BaBar will have petabytes (millions of GB) of data Collaborators need access to SLAC resources Much will be exported for processing WAN performance is critical to Modern HENP
4 WAN Connections OC48 (2.4Gbps) NTON OC12 link (622Mbps) Stanford (CalREN and Internet2) OC3 (155Mbps) ESnet These networks connect (peer) with other networks providing SLAC connectivity to the world.
5 ESnet provides SLACs primary connectivity, Including DoE labs and non-research sites
6 Utilization of ESnet link Link capacity is 155Mbps One point per day Average In Max In Average Out Max out
7 The California Research and Education Network (CalREN) connects Stanford and SLAC to UC sites and provides Connectivity to the Internet2 Networks. OC48 OC12
8 Internet2 is consortium of 180 Universities *. Network is Abilene and vbns. Connects many research sites including BaBar collaborators.
9 Utilization of Stanford Link Link capacity is 622Mbps One point per day Average In Max In Average Out Max out
10 The National Transparent Optical Network (NTON) Is a testbed for emerging technology. Currently testing with NASA-ARC, Caltech. Want SDSC. OC48, OC192 Potentially very high throughput.
11 End-to-end Performance Large Data Transfer Bandwidth, Congestion, Latency Almost all interesting links cross several networks Peering is critical (avoid public exchange points) Some applications also sensitive to variability in latency IN2P3, Roma, RAL
12 Performance Between SLAC and IN2P3 SLAC SNV ESnet CHI Star Tap PHYnet (Renater) IN2P3 Internet2 CERN 30-40Mbps 155Mbps 622Mbps Note: Current path is Indicated by arrow heads
13 Previous route was via CERN Current route is via PHYnet Note improved Round-trip-Time
14 Previous route was via CERN Current route is via PHYnet Note increase in Packet Loss
15 Incoming HTTP FTP SSH BBFTP Outgoing The typical internet is 70% HTTP (web)
16 Results and Future Plans Sustain 30Mbps * CERN-IN2P3 link will be upgraded to 155Mbps this summer Further upgraded to 622 Mbps by end of CERNs Transatlantic link and PHYnet will also be upgraded Bottleneck will become connection to Star Tap
17 Performance Between SLAC and Roma 25 Broadway (NY) ESnet Dante SLAC Internet2 60 Hudson (NY) GARR/INFN 50Mbps 155Mbps 622Mbps Note: Current path is Indicated by arrow heads Roma
18
19
20 Results Measured 26Mbps sustained throughput Dante upgrading network (Geant) Multi-gigabit Bottleneck is crossing New York Notoriously difficult to get fiber across NYC
21 Performance Between SLAC and RAL ESnet 60 Hudson (NY) SLAC JAnet Internet2 RAL 50Mbps 155Mbps 622Mbps Note: Current path is Indicated by arrow heads
22 The peering between ESnet and Janet was upgraded to 85Mbps in early February.
23
24 Results 40Mbps sustained UKERNA is in the process of upgrading to SuperJanet4 Proposed OC12 dedicated path. SLAC ESnet connection will be bottleneck
25 Summary Multiple high-speed connections Optimize routing Backup paths Well Engineered Networks Negligible packet loss, Good Round Trip Times Traffic doubled on ESnet every year since 1990
26 Future Networks Tremendous infrastructure development ESnet Upgrade SLAC Connection to OC12 Terabit (1000Gbps) backbone NTON Connecting to Chicago, which will give connection to CERN. Star Light
27 Conclusions Goals of HENP can be achieved We have the technology Known Goals Continued Monitoring and Engineering Feed Results back Engineers Users
28 Further Information
29 Any Questions?
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