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    CCNP BSCI Notes – Network Design

    By Raiy Wong | November 12, 2009

    Full mesh formula: n(n-1)/2

    Example: To create a mesh between 8 nodes, 8 * (8-1) / 2 = 28; 28 links are needed.

    Design concepts

    Legacy Hierarchical Design Model

              Core – fast L2-switched backbone

              Distribution – L3 switches

              Access – dense L2 switches

    This failed to address issues such as redundancy, Internet and remote access, and locating services.

    Switch block design was introduced to add redundancy; this included redundant core and distribution switches and links per switch block.

    Enterprise Composite Network Model

    This new model was developed to address modern design considerations.

             Enterprise campus

                     Campus backbone (previously the "core")

                     Building distribution (previously "distribution")

                     Building access (previously "access")


                     Server farm (for internal enterprise services)

             Enterprise edge


                     Internet connectivity

                     Remote access

                     WAN (internal links)

             Service provider edge



                     Frame relay, ATM, PPP for private connectivity

    Intelligent Information Network (IIN)

             Phase 1: Integrated transport – the shift toward the ECN model

             Phase 2: Integrated services – service virtualization (disassociation of services from individual machines)

             Phase 3: Integrated applications – recognizing and combining high-layer traffic properties (for example, Network Access Control)

    Services-Oriented Network Architecture (SONA)

    SONA is the application of IIN ideas to enterprise networks.

             Network infrastructure (IIN phase 1)

             Interactive services (IIN phase 2)

             Application (IIN phase 3)

    Routing protocols

             Distance vector – a router will only exchange routes with a directly connected neighbor

             Link-state – a router advertises a list of all its neighbors and its neighbors’ networks; routers run SPF to determine the best path


    Topics: CCNP, CCNP Notes | No Comments »


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