Specifies the maximum amount of time allowed between Routing
 updates on broadcast circuits.  When the timer expires before a
 routing update occurs, a routing update is forced.  The routing
 update produces a routing configuration message for each adjacent
 node.  Routing uses this timer to enforce a minimum delay between
 routing updates.  You can specify a number in the range 1 to 65,535.
 The default value is 40.