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Design paper of dual-core campus network
Now it's all switched networks, so the router cost is definitely not cost-effective. In addition, as a Layer 2 device, switches are definitely better than routing. If there are many routers, OSPF must be used. As long as you divide the area to ensure that you can physically connect with area 0, don't make any virtual connection. Anyway, manufacturers will not make a mess of routing strategy. As long as you make the three-layer network clear and dual-core, the core network should be completely interconnected.