This document discusses configuring VLANs on Cisco switches. It covers VLAN configuration topics like configuring VTP, creating and modifying VLANs, assigning ports to VLANs, configuring trunking, and troubleshooting VLAN issues. The document provides examples of Cisco IOS commands used to configure these features on Catalyst 1900 and Catalyst 2950 switches. It also describes show commands used to verify proper VLAN, VTP, and trunking operation.