Chapter 9. Implementing Ethernet Virtual LANs

At their heart, Ethernet switches receive Ethernet frames, make decisions, and then forward (switch) those Ethernet frames. That core logic revolves around MAC addresses, the interface in which the frame arrives, and the interface(s) out which the switch forwards the frame. Several switch features have some impact on an individual switch’s decisions about where to forward frames, but of all the topics in this book, virtual LANs (VLAN) easily have the biggest impact on those choices.

This chapter examines the concepts and configuration of VLANs. The first major section of the chapter explains the core concepts. These concepts include how VLANs work on a single switch, how to use VLAN trunking to create ...

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