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SISG Operations Concept for SSI - InterPlanetary Networking ...

SISG Operations Concept for SSI - InterPlanetary Networking ...

Operations Concept for a Solar System Internetwork (SSI)IOAG.T.RC.001.V14 Network Management Processes4.1 SSI CoordinationSSI network management requires agreement by the management of each agency to adoptshared protocols, principles, norms, rules, decision-making procedures, and negotiatingmechanisms governing the configuration and use of the SSI.Nodes participating in the SSI may be owned and operated by different space agencies. It isexpected that there will be no central management or ownership of the SSI and thatparticipating agencies will follow established, documented, interagency agreements forconfiguring cross support. However, efficient long-term SSI operations will necessarilyrequire increased automation of the mechanisms associated with negotiating andimplementing these cross-support agreements to expedite service execution.As shown in Figure 4-1, each agency will act as an “SSI Service Provider 2 ” for its user nodes,offering SSI services based on the capabilities of its provider nodes. From a userperspective, this SSI Service Provider function is similar to the role of an Internet ServiceProvider (ISP) for terrestrial Internet users. Service agreements will document the SSIservices that will be provided to the user based on its communications requirements acrossthe life cycle of the mission.In addition, agencies participating as providers in the SSI will reciprocally provide access toeach other’s nodes via a process known as peering. To be eligible, each participating SSIagency must offer peering services at the network layer of the OSI reference model.To serve as a component of the SSI, an agency’s provider nodes will offer a native networklayerrouting service based on:1. The bundle protocol of the DTN suite (suitable for use in any scenario), and/or2. The internet protocol of the IP suite (suitable for use only in continuously connected,delay-unaware scenarios)The peering points between different provider agencies’ SSI nodes are controlled byinteragency agreements.2 Based on this terrestrial ISP paradigm, the agency role of coordinating the provision of SSI servicesto user missions is sometimes referred to as a “Solar System Internetwork-Internet ServiceProvider,” or SSI-ISP. A given agency may implement multiple SSI-ISP instantiations to accomplishactivities in different solar system domains.Page | 24

Operations Concept for a Solar System Internetwork (SSI)IOAG.T.RC.001.V1Figure 4-1: SSI CoordinationThe confederation of participating agencies and the explicit set of user and provider nodeswill evolve over time as new missions are launched and as operational missions are phasedout or lost due to mission failure. Implementation of new provider nodes will be responsiveto the needs of individual space missions or space mission campaigns involving multiplemissions. In this way the overall configuration of the confederation and its participants willtherefore change to match evolving international mission plans. On this relatively long-termtime scale, service agreements and peering agreements will be updated to reflect changes inthe capabilities of the evolving SSI. Participating agencies will document agreed primarymechanisms for offering and negotiating their participation in the SSI confederation, and foroffering service commitments to their end users.While terrestrial ISPs can typically absorb surges in demand or additional customers, SSIproviders typically will not be able to do so without affecting other users of the network. SSIservice agreements will therefore take into account the resource constraints of the SSI andthe aggregate needs of SSI users.All participating agencies must conform to a common naming and addressing scheme. Oncedefined, this scheme will be administered by the CCSDS’s Space Addressing and NamingAuthority (SANA), which will coordinate development of an internationally agreedmechanism for assigning and registering identifiers (names and numbers) necessary forconfiguration and operation of the SSI.In addition, all participating agencies must implement a common security scheme at thenetwork layer to manage access to the services and to provide confidentiality as needed foruser data that is carried.Page | 25

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