3. Achievements to Date
We conducted joint studies toward the actualization of the Photonic IX as a novel architecture that can effectively handle the ever-increasing amount of traffic. The Photonic IX is characterized by its architecture, which allows for interworking between IP Routers and Layer-2 switches, both of which the ISP and IX have operated so far, and GMPLS-enabled OXCs, which NTT newly developed. If the amount of traffic between ISP IP Routers increases at the IX, IP Routers will use multiple output interfaces simultaneously and will potentially need fine-granular switching within the interface bandwidth (i.e., IP routing) and coarse granular switching at the interface unit. In such cases, it is possible to cope effectively with the increasing amounts of traffic by achieving interworking between IP routing and optical path (*4) level switching using the OXC.
For this joint experiment, NTT Laboratories developed the "optical path bandwidth control technology," and applied it to GMPLS-enabled OXCs, which allow for interworking with IP routing in order to handle a large amount of traffic. The optical path bandwidth control technology optimally adjusts the capacity of the optical path onto which the traffic is accommodated according to the increase or decrease in the traffic flow. This technology allows for cost-effective accommodation of optical paths between ISPs, where coarse granular optical paths are used. This technology also provides failure recovery by switching the failed optical path to its backup path. So far, we confirmed that the optical path bandwidth control technology operates effectively based on examination in an IX-simulated experimental configuration assuming traffic changes including bursty Internet traffic characteristics and sudden traffic changes with failures.