(Experimental intention: 1. Learn the configuration of VLAN on the switch and verify the working principle of VLAN. 2. Learn the configuration of the routing protocol on the router and view the contents of the routing table. 3. End the experiment report, which includes network topology, switch, router port configuration, VLAN and routing protocol configuration commands, VLAN content (showvlan), routing information (showiproute), laboratory effects, etc.)