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MANETS have gained considerable significance in research in the recent years. A MANET is a group of wireless nodes that can dynamically form a network to communicate information without using any preexisting fixed network infrastructure. The dynamic change of topology in MANETS causes link failures and route failures. Hence routing is considered to be a challenging issue in MANETs. The Optimized Link State routing (OLSR) is a table-driven pro-active protocol which uses the link-state scheme in an optimized manner to distribute topology information. As per IETF draft defacto values of Hello Interval are not suitable for OLSR routing protocol. In this paper, by varying the defacto values of Hello Interval time, how the performance is varied is analyzed using OPNET Simulator 14.5.