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The Science Data Network Core:

The increases in the total network bandwidth demand in the next several years are expected to be

mostly for circuit-like traffic involving specific experiments and computing systems. Given the

expense of high-bandwidth IP routers, and the fact that most of the large-scale science traffic end

points

will

be

relatively  static  in

nature (and therefore

the packets in the

network all tend to

go to the same places

and do not have to be

routed), switch based

technology is used to

manage the network

traffic  resulting  in

substantial

cost

savings.

The strategy, then, is

to build the SDN

core network is to

deploy a network that

is separate from (but

richly interconnected with) the IP core and that is made up of multiple 10 Gb/s circuits managed

by layer 2 / Ethernet switches.

Metropolitan Area Networks:

The strategy for connecting the DOE Science Labs reliably is to use a Metropolitan Area

Network ring architecture that effectively places the Labs directly on the ESnet core network.

More information about the MAN networks can be found in last year's ESnet report.

In 2007 the Chicago MAN was completed and five 10G circuits were connected from FNAL to

the international R&E peering point at Chicago Starlight.

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