The rapid growth of Internet and increase in real-time and multimedia applications have created a need to improve routing technology. Several proposals involving application of layer 2 switching technology to layer 3 routing have been made to counter above challenges. Noticeable efforts in this directions are IP Switching. Tag Switching
ARIS
CSR and MPLS. This paper does a survey of these approaches
especially IP Switching and gives comparison between IP Switching and MPOA.