ZyXEL Communications ZyWALL USG 300 User Manual page 271

Chapter 12 Policy and Static Routes
an interface's available bandwidth (bandwidth that is unbudgeted or unused by
the policy routes) depending on how many policy routes require more bandwidth
and on their priority levels. When only one policy route requires more bandwidth,
the ZyWALL gives the extra bandwidth to that policy route.
When multiple policy routes require more bandwidth, the ZyWALL gives the
highest priority policy routes the available bandwidth first (as much as they
require, if there is enough available bandwidth), and then to lower priority policy
routes if there is still bandwidth available. The ZyWALL distributes the available
bandwidth equally among policy routes with the same priority level.
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