*Author for correspondence Indian Journals of Science and Technology, Vol 9(20), DOI: 10.17485/ijst/2016/v9i20/89851, May 2016 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645 Performance Analysis of HSRP in Provisioning Layer-3 Gateway Redundancy for Corporate Networks C. V. Ravikumar 1* , Y. M. Srikanth 2 , P. Sairam 2 , M. Sundeep 2 , Kala Praveen Bagadi 2 and Visalakshi Annepu 2 1 Faculty of Electronics Engineering, VIT University, Vellore - 632014, Tamil Nadu, India; ravikumar.cv@vit.ac.in 2 School of Electronics Engineering, VIT University, Vellore - 632014, Tamil Nadu, India; srikanthy7@gmail.com, sairampathi0920@gmail.com, mandalaneni.sundeep@gmail.com, bkpraveen@vit.ac.in, kalapraveen189@gmail.com Keywords: Convergence, Gateway, HSRP, OSPF, Reliability, Routing Abstract The network functionaries incorporate and core networks aim to provide 99.999% reliability to their networks. The most preferred way to achieve this is to provide dynamic routing to the network. If the router gateway is disrupted by port failure, network administrator should manually configure the route in which packets are being forwarded. By using Hot Stand Routing Protocol (HSRP), it simultaneously adapts new route, which provides redundancy to the network with reduced packet loss. In this paper, our aim is to calculate the difference in number of packets lost when router with gateway is disrupted in the network by combining HSRP with Open Shortest Path First (OSPF) protocol. By using this combined technique, we can reduce the packet loss to maximum extent thereby increasing the reliability. The simulation results provide best route when HSRP is combined with OSPF than the existing technique without HSRP. 1. Introduction Network administrator aims to provide maximum reliabil- ity to its clients round the clock. But sometimes default gateway for the given network will be disrupted due to IP traffic. In a network without Hot Stand Routing Protocol (HSRP), manual assistance is required to adapt alternative path for forwarding packets which leads to packet loss in that duration. In such circumstances, HSRP protocol pro- vides redundancy to the network to minimize packet loss. Open Shortest Path First (OSPF) is used as a dynamic rout- ing protocol in this paper as it has high convergence rate and designate shortest path using Dijkstra’s algorithm. 2. Hot Stand Routing Protocol Routers Hot Stand Routing Protocol (HSRP) protocol involves two types of routers: 2.1 Active Router Active router is the one which is forwarding IP packets to the virtual router in first place. It shares same IP and Medium Access Control (MAC) address with the standby router. 2.2. Standby Router Standby group acts as backup to the active router. If active router was disrupted due to planned are unplanned rea-