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Using a VLANIF Interface to Implement Layer 3 Connectivity Between the Switch and Router
To reduce costs, most enterprises use switches to connect internal devices and an egress router to connect to an ISP network, as shown in Figure 4-22.
To access the ISP network, the core Layer 3 switch and egress router need to interwork at Layer 3. Most Layer 3 switches do not support routed interfaces or support a limited number of routed interfaces. Generally, a VLANIF interface is used as a Layer 3 interface to communicate with the Layer 3 sub-interface of the router, and then static route or a dynamic routing protocol is configured to implement Layer 3 connectivity between the core switch and egress router.
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