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In this paper, we propose a novel scalable cluster based routing protocol for Mobile Ad hoc Network (MANET) named as Scalable Cluster Based Ad hoc On-demand Distance Vector (SCBAODV). This proposed SCBAODV is scalable, minimizes route failure, controls the Network Routing Load (NRL), end-to-end delay and improves the Packet Delivery Ratio (PDR). The network is divided into clusters and each cluster has a single special node, called cluster head and others may be either general nodes or gateway nodes. Nodes are organized into a hierarchical structure of multi-hop clusters using a stable distributed clustering algorithm. In SCBAODV, intra-cluster routing information is maintained in a reactive manner and inter-cluster routing information is maintained in proactive manner. It focuses on improving the PDR while minimizing NRL and end-to-end delay by implementing the Blocking Expanding Ring Search (Blocking-ERS) and global repair technique as well as pre-emptive local route repair in the cluster.