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The figure shows a router icon inside the gray box to represent the Layer 3 switching function, with two VLAN interfaces on the right side of that icon. The branch still has two user VLANs (10 and 20), so the Layer 3 switch needs one VLAN interface for each VLAN. Note that the figure represents the internals of the Layer 3 switch within the box in the middle of the figure.

Figure 17-3 shows the design changes and configuration concept for the Layer 3 switch function with a router icon inside the switch, to emphasize that the switch routes the packets.įIGURE 17-3 Routing on VLAN Interfaces in a Layer 3 Switch To show the concept of Layer 3 switching with SVIs, the following example uses the same branch office with two VLANs shown in the earlier examples, but now the design will use Layer 3 switching in the LAN switch. (These interfaces are also referred to as switched virtual interfaces. The Layer 3 switch has an IP routing table, with connected routes off each of these VLAN interfaces. These VLAN interfaces act like router interfaces, with an IP address and mask.

The Layer 3 switching function needs a virtual interface connected to each VLAN internal to the switch. The configuration of a Layer 3 switch mostly looks like the Layer 2 switching configuration shown back in Parts II and III of this book, with a small bit of configuration added for the Layer 3 functions. The final major section of the chapter deals with the other option for configuring IPv4 addresses on Layer 3 switches: routed interfaces. This section explains one option, an option that uses switched virtual interfaces (SVI). Layer 3 switches typically support two configuration options to enable IPv4 routing inside the switch, specifically to enable IPv4 on switch interfaces.

The Layer 3 forwarding (routing) logic forwards IP packets between VLANs. The Layer 2 switch function forwards frames inside each VLAN, but it will not forward frames between VLANs. In sites with a larger LAN, network designers choose to use Layer 3 switches for most inter-VLAN routing.Ī Layer 3 switch (also called a multilayer switch) is one device, but it executes logic at two layers: Layer 2 LAN switching and Layer 3 IP routing. Using a router with ROAS to route packets makes sense in some cases, particularly at small remote sites.

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