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Meeting Bandwidth Requirements:

The end-state of

ESnet4

is

illustrated

in

Figure 10 and is

characterized by a

topological

richness

that

provides

resiliency,

flexibility,

and

scalability.

Resiliency comes

from

the

multiplicity

of

paths

between

any two locations

which

allow

transparent

Figure 10:ESnet4 End-Game: Core networks 50-60 Gbps by 2009-2010

recovery

from

(10Gb/s circuits), 500-600 Gbps by 2011-2012 (100 Gb/s circuits)

link

and

routing/switching element failure and in traffic engineering such as load balancing and congestion

avoidance because of the multiple paths between locations. It also provides for flexibility in the

deployment of new circuits both to match emerging science bandwidth needs and to deal with

changes in Office of Science budget priorities that might dictate a faster or slower build-out of the

network than what is currently planned. In providing the steadily increasing bandwidth that

projections from the science community indicate is required, in addition to adding 10Gb/s optical

circuits every year, it is expected that in the five-year time frame (2010­2012) that the capacity of

the individual optical circuits will increase from the current 10Gb/s to 100Gb/s. This will be taken

advantage of by replacing the current generation of routing/switching devices with next-

generation devices.

Status and Schedule:

The ESnet4 circuit deployment is on-schedule. See www.es.net/ESnet4 for more information.

The 12/2007 circuits are shown in Figure 8. The SDN switches for the SDN core nodes will be

ordered within the next few months. In the 2010 time frame we anticipate that the optical

infrastructure will be upgraded from 10 GB/s per circuit to 100Gb/s per circuit. ESnet is planning

for an equipment upgrade at that time which will result in SDN becoming a 500Gb/s backbone.

Note that the rollout schedule given above and in the presentation on the Web is our current best

estimate. Schedule risks include equipment delivery delays and the impact of Federal budget

changes.

Managing Large-Scale Data Flows, Virtual Circuit Services:

The need for virtual circuit (VC) services to provide quality of service (QoS ­ e.g., guaranteed

bandwidth) and traffic isolation were identified as one of the most important new network

services by the science requirements workshops 0, 0.

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