Vehicular Ad-hoc network (VANET) is an exacting form of Mobile Ad-hoc Network (MANET) where the vehicles are act as nodes. Due to high mobility of nodes, high partitioned network and also dynamic changing routing protocols, the routing in Vanet is dispute one. The routing protocols functions should depends on the internal and external characteristics of VANET such as nodes mobility, road topology and obstacles which block the signal. A routing protocol is used to find the route between the nodes to communicate each other. The particular route to be selected by routing protocol. The routers have the information about the network which is directly connected to it. The routing protocol first forward the information to the immediate neighbor node, then it forward the information throughout the network. In VANET the routing protocol are classify based on topology, position of vehicle, cluster based vehicle, broadcast based routing and geocast based routing. This article explains the topology based routing protocol, especially reactive routing protocol which is a part of the topology based routing protocol.
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