when an update message with a smaller sequence number is received, see if the received metric is INFINTY. If yes, send out an update message.2) might need to add last settle time in the settling time table3) if we addd that entry, then the get settling time function should be modified to use the value of last settling time. Also while calculating the new avg settling time, it should be just calculated as an avg valu, not usinf STL_AVG_FACTOR. The just computed settlingtime should be stored in the last settling time field. The STL_AVG_FACTOR should be used while getting the value of settling time to delay the broadcast.4) refresh settling time table entries also in the periodic timer handler function5) redefine DELAYED_BROADCAST_TIMER as DELAYED_UPDATE_TIMER6) redefine REFRESH_TIMER to BROKEN_LINK_TIMER7) set the nexthop to zero when a link breaks.