Configuring Inter-VLAN Routing

In Chapter 14, “Configuring Switches,” you learned that when switches are configured with VLANs, hosts in different VLANs cannot communicate without the help of a router. Consider the router and switch in Figure 15.2.

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FIGURE 15.2 Inter-VLAN routing

SW 1 is configured with two VLANs: VLAN 10 and VLAN 20. The switch ports Fa0/20 and Fa0/21 have been added to VLAN 20. The switch ports Fa0/10 and Fa0/11 have been added to VLAN 10.

The computers connected to those switch ports will not be able to communicate with one another until inter-VLAN routing is configured on R1. The first step is to connect the router to the switch ...

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