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This paper presents a trust based collaborative approach to mitigate black hole nodes in AODV protocol for MANET. In this approach every node monitors neighbouring nodes and calculates trust value on its neighbouring nodes dynamically. If the trust value of a monitored node goes below a predefined threshold, then the monitoring node assume it as malicious and avoids that node from the route path. The experiments reveal that the proposed scheme secures the AODV routing protocol for MANET by mitigating and avoiding black hole nodes.