A method and system for MLPPP sequence number synchronization between the active and standby side transmitters is disclosed. The MLPPP sequence number synchronization system includes a method for the standby side to associate transmit frame fragment numbers used by the active side to those generated by the transmitter on the standby side. The association is used to produce an offset which is used to synchronize the active and standby transmitters. The MLPPP sequence number synchronization system is particularly useful for overcoming the drawbacks of high bandwidth signaling between active and standby sides of switches known in the art.