Sep 2 – 9, 2007
Victoria, Canada
Europe/Zurich timezone
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Use of Alternate Path WAN Circuits for CMS

Sep 5, 2007, 4:30 PM
Carson Hall B (Victoria, Canada)

Carson Hall B

Victoria, Canada

oral presentation Computer facilities, production grids and networking Computer facilities, production grids and networking


Mr Philip DeMar (FERMILAB)


Fermilab hosts the American Tier-1 Center for the LHC/CMS experiment. In preparation for the startup of CMS, and building upon extensive experience supporting TeVatron experiments and other science collaborations, the Laboratory has established high bandwidth, end-to-end (E2E) circuits with a number of US-CMS Tier2 sites, as well as other research facilities in the collaboration. These circuits provide preferred network paths for movement of high volumes of CMS data and represent a departure from the traditional approach of utilizing the general research and education (R&E) network infrastructure for movement of science data. All circuits are statically configured and are based on a variety of underlying network technologies. These circuits are presumed to provide, and generally do provide, more predictable performance, and they avoid the traffic contention concerns of general-use R&E network links. But the circuits also add significant complexity and effort for the Laboratory’s wide area network support. This presentation will discuss Fermilab’s experiences with deploying, managing, and utilizing E2E circuits as preferred network paths in parallel with the general IP R&E network infrastructure. Alternate path routing techniques, monitoring issues, troubleshooting, and failover concerns will be covered. Issues of scalability and evolution toward dynamic circuits will also be discussed.

Primary author

Mr Philip DeMar (FERMILAB)


Mr Andrey Bobyshev (FERMILAB) Mr Don Petravick (FERMILAB) Dr Matt Crawford (FERMILAB) Mr Maxim Grigoriev (FERMILAB) Mr Vyto Grigaliunas (FERMILAB)

Presentation materials