LHCOPN and LHCONE an introduction
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1 LHCOPN and LHCONE an introduction APAN workshop Nantou, 13 th August 2014 CERN IT Department CH-1211 Genève 23 Switzerland 1
2 Summary - WLCG - LHCOPN - LHCONE - L3VPN - P2P - perfsonar 2
3 WLCG 3
4 Worldwide LHC Computing Grid WLCG sites: - 1 Tier0 (CERN) - 13 Tier1s - ~170 Tier2s - >300 Tier3s worldwide 4
5 Role of Networks in WLCG Computer Networks are an essential component of the WLCG Data analysis in LHC Run 2 will need more network bandwidth between any pair of sites 5
6 Networks for WLCG Two dedicated, private data network have been built for WLCG: - LHCOPN (Tier0-Tier1s) - LHCONE (Tier1s-Tier2s) 6
7 LHCOPN LHC Optical Private Network 7
8 What is the LHCOPN: Private network connecting Tier0 and Tier1s Reserved to LHC data transfers and analysis Dedicated large bandwidth links Highly resilient architecture 8
9 A collaborative effort Layer3 (IP): designed, built and operated by the Tier0-Tier1s community Layer1-2 (transmission): links provided by Research and Education network providers: Asnet, ASGCnet, Canarie, DFN, Esnet, GARR, Geant, JANET, Kreonet, Nordunet, Rediris, Renater, Surfnet, SWITCH, TWAREN, USLHCnet 9
10 Topology TW-ASGC CA-TRIUMF US-T1-BNL US-FNAL-CMS KR_KISTI NDGF CH-CERN RRC-K1-T1 FR-CCIN2P3 UK-T1-RAL ES-PIC NL-T1 DE-KIT IT-INFN-CNAF = Alice = Atlas = CMS = LHCb edoardo.martelli@cern.ch
11 Technology - Single and bundled long distance 10G Ethernet links - Multiple redundant paths. Star and Partial-Mesh topology - BGP routing: communities for traffic engineering, load balancing - Security: only declared IP prefixes can exchange traffic 11
12 LHCOPN future - The LHCOPN will be kept as the main network to exchange data among the Tier0 and Tier1s - Links to the Tier0 may be soon upgraded to multiple 10Gbps or 100Gbps (waiting for Run2 to see the real needs) 12
13 LHCONE LHC Open Network Environment 13
14 New computing model - Better and more dynamic use of storage - Reduced load on the Tier1s for data serving - Increased speed to populate analysis facilities Needs for a faster, predictable, pervasive network connecting Tier1s and Tier2s 14
15 Computing model evolution Original MONARCH model Model evolution 15
16 Requirements from the Experiments - Connecting any pair of sites, regardless of the continent they reside - Site's bandwidth ranging from 1Gbps (Minimal), 10Gbps (Nominal), to 100G (Leadership) - Scalability: sites are expected to grow - Flexibility: sites may join and leave at any time - Predictable cost: well defined cost, and not too high 16
17 LHCONE concepts - Serving any LHC sites according to their needs and allowing them to grow - Sharing the cost and use of expensive resources (like transoceanic links) - A collaborative effort among Research & Education Network Providers - Traffic separation: no clash with other data transfer, resource allocated for and funded by the HEP community 17
18 Governance LHCONE is a community effort. All stakeholders involved: TierXs, Network Operators, LHC Experiments, CERN. 18
19 LHCONE services L3VPN (VRF): routed Virtual Private Network - operational P2P: dedicated, bandwidth guaranteed, point-topoint links - development perfsonar: monitoring infrastructure - operational 19
20 LHCONE L3VPN 20
21 What LHCONE L3VPN is: Layer3 (routed) Virtual Private Network Dedicated worldwide backbone connecting Tier1s and Tier2s (and Tier3s) at high bandwidth Reserved to LHC data transfers and analysis 21
22 Advantages Bandwidth dedicated to LHC data analysis, no contention with other research projects Well defined cost tag for WLCG networking Trusted traffic that can bypass firewalls 22
23 LHCONE L3VPN architecture - TierX sites connected to National-VRFs or Continental-VRFs - National-VRFs interconnected via Continental-VRFs - Continental-VRFs interconnected by trans-continental/trans-oceanic links Acronyms: VRF = Virtual Routing Forwarding (virtual routing instance) TierXs TierXs TierXs TierXs TierXs National links National links National links National VRFs National VRFs National VRFs National VRFs Cross-Border links Cross-Border links Cross-Border links Continental VRFs Transcontinental links Continental VRFs Transcontinental links Continental VRFs LHCONE 23
24 Current L3VPN topology ICEPP U Tokyo SINET Japan KNU KERONET2 Korea ASGC-T1+T2 ASGC2 ASGC Taiwan Seattle Los Angles UVic SimFraU UAlb TRIUMF-T1 SLAC FNAL-T1 CENIC USA AGLT2 UM CIC OmniPoP BNL-T1 Caltech AGLT2 MSU CANARIE Canada Chicago (StarLight) AGLT2 WSU ESnet USA IU MIT UIUC Indiana GigaPoP SCINET (UTor) McGill UNL MWT2 New York (MAN LAN) NL-T1 SARA Netherlands Amsterdam NDGF-T1b RWTH NDGF-T1 NORDUnet Nordic CERN-T1 CERN (CERNLight) Geneva GSI DESY GÉANT Europe Wup.U TIFR India DFN Germany NDGF-T1c KISTI Korea DE-KIT-T1 Kurchatow T1 Geneva Korea India NCU NTU TWAREN Taiwan UWisc Vandebilt PurU UCSD NE UFlorida GLakes SoW UNeb Internet2 USA Harvard Washington (WIX) IN2P3 (10 sites) CC-IN2P3-T1 RENATER France CEA (IRFU) PIC-T1 RedIRIS Spain INFN (9 sites) GARR Italy CNAF-T1 UNAM CUDI Mexico NTU Chicago LHCONE VRF domain End sites LHC Tier 2/3 unless indicated as Tier 1 Regional R&E communication nexus LHCONE VRF aggregrator networks Sites that are standalone VRFs August 7, 2014 Communication links, 10, 20, 30, and 100Gb/s See for details. credits: Bill Johnston, ESnet 24
25 Status Over 15 national and international Research Networks Several Open Exchange Points including NetherLight, StarLight, MANLAN, CERNlight and others Trans-Atlantic connectivity provided by ACE, GEANT, NORDUNET and USLHCNET ~55 end sites connected to LHCONE: - 10 Tier1s - 45 Tier2s Credits: Mian Usman, Dante More Information: 25
26 Operations Usual Service Provider operational model: a TierX must refer to the VRF providing the local connectivity Bi-weekly call among all the VRF operators and concerned TierXs 26
27 LHCONE P2P Guaranteed bandwidth point-topoint links 27
28 What is LHCONE P2P: On demand point-to-point (P2P) link system over a multi-domain network Provides P2P links between any pair of TierX Provides dedicated P2P links with guaranteed bandwidth (protected from any other traffic) Accessible and configurable via software API 28
29 Status Work in progress: still in design phase Challenges: - multi-domain provisioning system - intra-tierx connectivity - TierX-TierY IP routing - APIs for WLCG software 29
30 LHCONE perfsonar 30
31 What is LHCONE perfsonar LHCONE Network monitoring infrastructure Probes installed at: - VRFs interconnecting points - TierXs Accessible to any TierX for network healthiness checks 31
32 Status Endorsed by WLCG to be a standard WLCG service Probes already deployed in many TierXs. Being deployed in the VRF networks More information: 32
33 LHCONE evolution - VRFs have started upgrading internal links and links to TierXs to 100Gbps - VRFs interconnecting links will be upgraded to 100Gbps. 100Gbps Transatlantic link being tested. - Operations need to be improved, especially how to support a TierX in case of performance issue - perfsonar deployment will be boosted 33
34 Conclusions 34
35 Conclusions - New Computing Models will relay even more on good and abundant network connectivity - Tier2s need to improve their network connectivity - LHCONE-L3VPN is a viable solution already adopted by many Tier1/2s 35
36 More information Last LHCONE workshop: LHCONE websites: Weekly audio conference: Monday 14:30 GMT, alternating every second week architecture and operations Mailing lists: 36
37 Questions? 37
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