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Large-scale (Campus) Lan design (Part II)
VLANs Hierarchical LAN design
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Virtual LANs (VLANs) VLANs consist of end systems that are members of a single logical broadcast domain. A VLAN has no physical proximity constraints for the broadcast domain A VLAN can span various pieces of network equipment that support VLAN trunking protocols between them Without a router, hosts in 1 VLAN can’t communicate with hosts in another VLAN
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Single-switch VLANs
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VLAN Benefits VLANs break networks into smaller broadcast domains
VLANs provide security Easier network management Well-behaved VLANs usually follow 80/20 network design rule
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VLAN Example
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VLAN Trunking Trunk – high-speed connection between internetworking devices Switches use Trunking protocol to exchange information about VLAN configuration (e.g. IEEE 802.1Q, Cisco’s ISL) With trunking, tags are added to all the frames traveling on the trunk
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VLANs are shared through trunks
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VLAN Implementation By port – each port must belong to only 1 VLAN
By protocol – single port can support more than 1 VLAN By a user-defined value – e.g. MAC address
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Single switch VLANs
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Backbone Traditional Collapsed
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Redundancy in the Backbone
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Distributed backbone (multiple collapse points)
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Hierarchical Design Access Distribution Core
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Hierarchical Design
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Central Routing
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Distributed Routing
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Small campus
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Medium campus
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Large campus
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