Cisco IOS 120 Switching Services Author:Cisco Systems Inc. Cisco IOS 12.0 Switching Services is a comprehensive guide detailing available Cisco IOSswitching alternatives. Cisco switching services range from fast switching and Netflow switching to LAN Emulation. This book describes how to configure routing between virtual LANs (VLANs) and teach how to effectively configure and implement VLANs on switches.