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Proactive protocol stores the information of routing and constantly updates the information by changing the control packet in their neighbors. Link-state routing algorithms are used in which uses link information from their near nodes frequently. DSDV, OLSR, and WRP are examples of proactive routing protocol as shown in Figure 6.2 and a comprehensive comparative analysis is presented in Table 6.1.

Figure 6.2 MANETs routing protocol.

Table 6.1 Comparison of proactive reactive and hybrid protocol.

Features	Reactive	Proactive	Hybrid
Mobility	Route maintenance	Periodic update	Combination of both
Storage requirement	Low	High	Medium
Bandwidth requirement	Low	High	Medium
Power requirement	Low	High	Medium
Stability	Not suitable for large networks	Low	Suitable for high networks
Latency	High due to flooding	Low due to routing table	Low outside the range
Route information	Available when required	Always available	Combination of both
Route structure	Flat	Both flat and hierarchical	Hierarchical
Route overhead	Low	High	Medium