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Large-scale (Campus) Lan design (Part I)

Introduce campus LANs Review basic LAN topologies LAN Switching: evolution from shared LANs LAN Switching vs Routing. Large-scale (Campus) Lan design (Part I). Local area constrained to a fixed geographical area. Uses LAN technologies – Ethernet/Fast/Gigabit, Token Ring, FDDI, ATM

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Large-scale (Campus) Lan design (Part I)

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  1. Introduce campus LANs Review basic LAN topologies LAN Switching: evolution from shared LANs LAN Switching vs Routing Large-scale (Campus) Lan design (Part I)

  2. Local area constrained to a fixed geographical area Uses LAN technologies – Ethernet/Fast/Gigabit, Token Ring, FDDI, ATM Switching and routing technologies Large-scale (Campus) LAN

  3. Example of a campus network

  4. Basic LAN topologies • Bus • RingFDDI • Star • All are prone to scalability problems

  5. Evolution from shared to switched networks • Factors stressing capabilities of traditional (shared) LANS: • Faster CPUs • Faster Operating Systems • Network-intensive applications

  6. Simple LAN switch

  7. Benefits of switching • Bandwidth (not shared) • VLANs • Security

  8. Routers use Layer 3 information to make routing decisions (routing tables) and choose the “optimal” path Routers use routing protocols (e.g. OSPF, BGP) to exchange updates/routing info Routers filter broadcasts and multicasts, switches don’t – can create broadcast storm Routers create separate broadcast domains Switches don’t have network (host) addresses, routers do. Routers modify destination’s physical (not network) address Routers

  9. Switching vs Routing

  10. Layer 2 - STP (Spanning Tree Protocol IEEE 802.1D (newer protocols include RSTP and MSTP) Reliability (Fault-Tolerance) Mechanisms

  11. Spanning Tree Port States

  12. Reliability (Fault-Tolerance) Mechanisms • Layer 3 – VRRP and HSRP A typical LAN

  13. Reliability (Fault-Tolerance) Mechanisms • Layer 3 – VRRP and HSRP HSRP addressing

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