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

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Presentation transcript:

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 Local area constrained to a fixed geographical area Uses LAN technologies – Ethernet/Fast/Gigabit, Token Ring, FDDI, ATM Switching and routing technologies

Example of a campus network

Basic LAN topologies Bus Ring FDDI Star Basic LAN topologies Bus Ring FDDI Star All are prone to scalability problems

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

Simple LAN switch

Benefits of switching Bandwidth (not shared) VLANs Security

Routers 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

Switching vs Routing

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

Spanning Tree Port States

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

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