International Journal of Advanced Research in Computer Engineering & Technology (IJARCET) Volume 3 Issue 8, August 2014 2656 ISSN: 2278 – 1323 All Rights Reserved © 2014 IJARCET COMPARATIVE STUDY OF OSPFV3, IS- IS AND OSPFV3_IS-IS PROTOCOLS USING OPNET JAGMEET KAUR, Er. PRABHDEEP SINGH Abstract: As IPV6 is becoming popular day by day; due to its wide range of applications; and great hierarchy of IPs. But selecting the best protocol among available is found to be critical task. This paper includes Intermediate System To intermediate System (IS-IS) and Open Shortest Path First V3(OSPFV3) Protocol and mentioned IPv6 network’s performance evaluation on the basis of Video End to End Delay, End to End Delay in Voice,Jitter. In this paper, to get the results, three different scenarios are desigined, in first scenario Intermediate System To intermediate System (IS-IS) has to be implemented. In second scenario, Open Shortest Path First V3 (OSPFV3) protocol has to be implemented. In third scenario, combination of both protocol need to be implemented in one network. To analyse the performance of both routing protocol, we use the OPNET simulator. Keywords: OPNET, IPV6, LINK STATE ROUTING, OSPFV3, IS-IS. 1. INTRODUCTION Internet has become integral part of our life. We are using many services like video streaming, email and file transfer. These are all based on packet data and routing protocol has important role to deliver packet across the internet. There are many protocols existing in IP network. We take Open Shortest Path First V3 (OSPFV3) and Intermediate System to intermediate System (IS-IS) .Both protocols comes from link state. The router has prior knowledge about the adjacent networks which can assist in selecting the routes between two nodes. There are different types of routing protocols in the IP networks. Three classes are common on IP networks as follows:  Interior gateway routing over link state routing protocols, such as IS-IS and OSPF.  Interior gateway routing over distance vector Protocols, such as RIP, IGRP and EIGRP.  Exterior gateway routing, such as BGP v4 routing protocol. 2. ROUTING PROTOCOLS In IP networks, the main job of a routing protocol is to transmit packets forwarded from one node to another. In a network, routing can be defined as transmitting information from a source to a destination by hopping one-hop or multi hop. Routing protocols should provide at least two facilities: selecting routes for different pairs of source/destination nodes and, successfully transmitting data to a given destination.Routing protocols are used to explainhow routers communicate to each other, learn available routes build routing tables, make routing decisions and share information among neighbours. Routers are used to connect multiplenetworks and to provide packet forwarding for different types of networks.The main objective of routing protocols is to determine the best path from a source to a destination. A routing algorithm uses different metrics based on a single or on several properties of the path in order to determine the best way to reach a given network. Conventional routing protocols used in interior gateway networks are classified as Link State Routing Protocols and Distance Vector Routing Protocols.Routing protocols can be classified as:  Static and dynamic routing protocols.  Classful and Classless routing protocols.  Distance Vector and Link State routing protocols. 3. LINK STATE ROUTING Link State Routing (LSR) protocols are also known as Shortest Path First (SPF) protocol where each router determines the shortest path to each