As you can see, the Nexus switch in Figure 18-10 creates a VLAN for both hosts to communicate then enables an interface for VLAN 10 and 20 that has IP connectivity enabled. The top layer of this figure is representative of a logical router that is created for each VLAN (10 and 20, respectively) and assigned an IP address. This allows for many Layer 2 interfaces to be part of either of these networks and also enables the Cisco Nexus switch to route between them if communication is needed using the SVI interfaces. In the past, when there were no multilayer switches like a Cisco Nexus switch, you had to attach separate physical routers to your switched network and send packets up to them to route between different

networks, as shown in Figure 18-11.

	Created by Isaac Farias about 8 years ago

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