An exception rule acts as a default when all other rules within an origin ID fail based on their criteria. Use an exception rule to provide an action to take when no other rules apply. Only one exception rule is allowed within an origin. This exception rule has no criteria set against it and is only used when all other rules within an origin fail to fire. To specify that a rule is an exception rule, select the Exception Rule field in the header of the Routing Guide rule for the associated origin.