4.1 VLAN Basics
4.1.8 Wrong motives for implementing VLANs
One common motivation for using VLANs tends to get network administrators excited. Unfortunately, reality quickly meets enthusiasm, revealing errors in motivation. The advent of VLANs led many to believe that a network administrator's life would be simplified. Administrators thought that VLANs would eliminate the need for routers, everyone could be placed in one giant flat network, and administrators could go home at reasonable hours each evening. This turns out to be far from the truth. VLANs do not eliminate Layer 3 issues. They may allow you to more easily perform some Layer 3 tasks, such as developing simpler access lists, but Layer 3 routing still must exist.