Proactive Routing protocols

The proactive routing protocols maintain consistent and updated routing information for all pairs of network nodes by propagating proactive route updates at fixed time intervals. This protocol can also be termed as Table-Driven protocols as the routing information is stored in a table. The most important feature of this protocol is the constant maintaining of a route by every node to all other nodes. It creates and maintains the routes through both periodic and event-driven. The most commonly used proactive protocols are Destination-Sequenced Distance vector (DSDV), Optimized Link State Routing (OLSR), andTopology Dissemination based on Reverse Path Forwarding (TBRPF). In DSDV, the nodes maintain a route table with one route entry for each destination that records the shortest route path. This protocol can be extended to improve the protocol performance (scalability) using heuristic methods such as priority token scheduling, gateway code scheduling, and path reservation. OLSR protocol is optimized for mobile ad hoc network using a multipoint relay (MPR).