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how to establish layer 2 and layer 3 fail-over (redundancy) for Campus network.5000 users and multi-location+multi building+multi floors.Looking for suitable products and design.

Hello , I Am looking for Campus networking solution.we have 5 buildings spread across the 200 Mts radius. each building has 3 to 10 floors. and we have around 3000 systems.1.I am thinking of putting good products , that should supports Data, Voice an...