We propose LTE and CBRD to reduce route discovery overhead of reactive routing protocols for Mobile Ad hoc Networks (MANETs). LTE proactively distributes topology information of the network by using a lazy update policy. That topology information is used by CBRD to optimize route discoveries. CBRD is a reactive route discovery mechanism which employs topology information provided by LTE to restrict route discovery floods to limited regions containing desired destinations. Our simulation results have shown that LTE and CBRD efficiently reduce route discovery overhead as well as route discovery delay. Also, they improve routing performance of flooding dependent reactive routing protocols like AODV in low- and moderate-traffic networks.