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Understanding SCSP: Phases, Protocols, and Applications

This chapter explores the significance of the Server Cache Synchronization Protocol (SCSP), detailing its necessity in modern networking. You will learn the three implementation phases of SCSP, defining its sub-protocols and their interactions with MARS and NHRP. Key topics include the SCSP topology model, local and remote server dynamics, the Hello protocol, state transitions, cache management, and applications of SCSP in various network scenarios. After completing this chapter, you will have a comprehensive understanding of SCSP processes and their relevance to efficient cache synchronization.

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Understanding SCSP: Phases, Protocols, and Applications

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  1. Chapter Objectives After completing this chapter you will be able to: • Describe why SCSP is needed • Describe the three phases of SCSP and how they are implemented • Define the sub-protocols of SCSP • Describe how the SCSP protocol is used with MARS and NHRP

  2. RS DCS DCS SCSP Topology Model Server Group A Server Group B DCS DCS RS LS Local Server (LS) Directly Connected Server (DCS) Remote Server (RS) LS

  3. SCSP Phases

  4. DCS DCS Hello Hello • Sender ID • Receiver ID • Hello Interval • DeadFactor LS Hello Protocol

  5. Down Waiting Bidirectional Connection Unidirectional Connection Hello Protocol States

  6. CSAS Records DCS 2 CSAS Records DCS 1 DCS 1 DCS 2 Cache State Advertisement Summary Records (CSAS records) LS LS Cache Alignment Protocol

  7. Down Master/Slave Negotiation Cache Summarise Aligned Update Cache Cache Alignment Protocol States

  8. DCS • Add an entry • to your cache • Remove an entry • from your cache Cache entry has been modified Cache entry has timed out LS Cache State Update Protocol Changes of State in the Cache of the LS

  9. Applications of SCSP • MARS • NHRP • ATMARP

  10. MARS Servers Cache synchronised with Sub Cache A Cache synchronised with Sub Cache B Sub Cache A Sub Cache B

  11. NHRP Servers • All NHRP servers in the same LIS are in the same server group • An NHRP client registers with only one NHRP server but may use any NHRP server within the server group

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