Aiming at problem that link state routing（ LSR） protocol using distance vector can increase convergence of routing

but still suffer from a trade-off between control message overhead and routing convergence

the optimal link state routing（ OLSR） of Lagrange multiplier-based optimal transmission control message interval model（ LMM）is proposed. Routing loss and control overhead caused by node failure are computed

goal function is constructed according to control overhead based on given

and the principle of minimizing routing loss. Solution of goal function is done by Lagrange multiplier

the optimal control message interval are computed. LMM is introduced to OLSR

which is marked as LMM-OLSR. Experimental results show that LMM-OLSR outperforms than OLSR in terms of end-to-end transmission delay and data packet loss ratio.