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An Implementation of the Server Cache Synchronization Protocol (SCSP)

TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY. An Implementation of the Server Cache Synchronization Protocol (SCSP). Jose Costa Requena Raimo Kantola jose@tct.hut.fi Raimo.Kantola@hut.fi. SPIE Conference Boston, September 1999. Contents. TEKNILLINEN KORKEAKOULU

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An Implementation of the Server Cache Synchronization Protocol (SCSP)

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  1. TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY An Implementation of the Server Cache Synchronization Protocol (SCSP) Jose Costa Requena Raimo Kantola jose@tct.hut.fi Raimo.Kantola@hut.fi SPIE Conference Boston, September 1999

  2. Contents TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY Problem Definition SCSP as Solution • Protocol Specifications (RFC 2334) • Basic Features Our Implementation • Modules in the implementation • Interaction between modules Applications GLP Implementation GLP Interoperability : IP GSTN Conclusions and Future Work SPIE'99

  3. Subscriber & User Database Problem Definition TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY Directories are key component for IP based communications networks. The large amount of data is stored in distributed databases the changes must be updated among the entities related to the same service. Subscription & Service Profile Management Service Provider Billing Value Added Service Provider User Data Management Billing Usage Usage Network Operator Usage SPIE'99

  4. Problem Definition TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY Directories hold static and dynamic information about the users and the services themselves. Services need to interoperate across administrative boundaries and directories need to be accessible from everywhere. IP Telephony Signaling server Zone B Database Zone B Zone A Database Zone A IP Telephony Signaling server SPIE'99

  5. Our Solution TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY The SCSP solves the problem of data replication/synchronisation in a group of distributed servers without heavy overheads like in the actual tight consistency techniques. IP Telephony Signaling server SCSP SCSP IP Telephony Signaling server SPIE'99

  6. SG DCS DCS DCS DCS LS SCSP Specifications TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY The SCSP elements Server Group (SG). Is the group of servers to be synchronised. Local Server (LS). Is the server under scrutiny. Direct Connected Server (DCS). Is the server directly connected to LS. SPIE'99

  7. Hello Protocolis used to know whether the connection between servers is available. Cache Alignment Protocolallows a server to synchronise its entire data: exchanging short summaries from the entire database, comparing of summaries to know the newest data, requesting the entire information to the server which provided the summary with the newest data Cache State Updateperforms a flooding mechanism where any new information in one of the servers is dynamically updated in all other servers. TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY SCSP Specifications The SCSP is based onthreesub-protocols. SPIE'99

  8. DATA BASES User Interface User Interface DATA BASES Auto Config System Auto Config. System SCSP SCSP OBJECT TABLES OBJECT TABLES TCP/IP TCP/IP TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY SCSP Modules SCSP Algorithms module Communications module (TCP/IP) User Interface Auto Configuration System Databases module Object Tables SPIE'99

  9. HFSM HFSM CAFSM CAFSM CSU CSU SCSP SCSP Modules Interaction TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY Server i Server i+1 Hello Packets Cache Alignment packets CLIENT USE SCSP PRIMITIVES CLIENT USE SCSP PRIMITIVES Cache State Update packets t t t SPIE'99

  10. GLP GLP SCSP SCSP database database SCSP Applications TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY SCSP for data replication in the GLP Implementation ITAD 3 LS ITAD 1 GLP LS database ITAD 2 LS GLP: Gateway Location Protocol LS: Location Server ITAD: Internet Telephony Administrative Domain SPIE'99

  11. GATEKEEPER GATEKEEPER Applications TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY SCSP as the common element for a global GLP Implementation and interoperability between GSTN and IP GLP Database SCSP SS7 PSTN GLP Database SCSP SPIE'99

  12. GATEKEEPER GATEKEEPER Applications TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY SCSP as basic component to allow interoperability between IN databases and user information directories in IP GLP Database SCSP Databases SCSP GLP Database SCSP SCP IP SS7 PSTN or GSM SPIE'99

  13. We continue working on future applications of the SCSP as the generic component to allow interoperability between IN and IP services. SCSP could become a key component of the emerging directory enabled networks. TEKNILLINEN KORKEAKOULU HELSINKI UNIVERSITY OF TECHNOLOGY Conclusions NOWADAYS ... SCSP has been developed in a modular way to provide a generic service to be used by other systems for their data replication. SCSP follows a building-block design to permit its integration with other mechanisms to achieve an efficient overall behaviour. In terms of overall positioning we consider the SCSP as a key tool for the future services globalisation. NEXT... SPIE'99

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