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Figure 17: Fermilab's Man Channel Configuration

Wide-Area Data Movement Support:

Fermilab's model for wide area network support is to utilize alternate path, end-to-end (E2E) data

circuits for high impact data movement, if the capability to establish such circuits is available.

This model is consistent with ESnet's architecture of providing parallel backbones, one for

general routed IP traffic and the other for movement of high impact, open science data. The

Laboratory currently supports alternate path E2E circuits to the LHC Tier-0 Facility at CERN, six

of the seven US-CMS Tier-2 sites, and a number of remote sites involved in the Run-II

experiments. The effectiveness of the circuit-based, alternate path approach is evident in the

aggregate outbound traffic graph for the Laboratory (Figure 18). In 2007, the outbound traffic

sourced from the site amounted to 13.3 petabytes, a 340% increase over the 2006 level. A

breakdown of the outbound traffic total reveals that 77% of the traffic was carried across the E2E

data circuits. The 340% increase in the yearly outbound traffic similarly breaks down to a 457%

increase in circuit-based traffic versus only a 181% increase in conventional routed IP traffic. It

is worth noting that in July, 2007, the Laboratory established a new monthly peak for outbound

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