Specifies the maximum acceptable administrative weight
for alternate routes as a percentage factor of the least
administrative weight of any route to the destination.
The constraint on administrative weight only takes effect
when background route computation is enabled.
The constraint on administrative weight increases network
efficiency under heavy loads by preventing alternate routes
that use too many network resources from being specified.
This constraint provides a generalized form of a hop count
limit.
The distinguished value zero indicates that there is no
constraint on administrative weight for alternate routes.
All other valid values are greater than or equal to 100
percent.