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Chapter 9 Policy and Static Routes
ZyWALL 110/310/1100 Series User’s Guide
198
the following twelve DSCP encodings from AF11 through AF43. The decimal equivalent is listed in
brackets.
Maximize Bandwidth Usage
The maximize bandwidth usage option allows the ZyWALL to divide up any available bandwidth on
the interface (including unallocated bandwidth and any allocated bandwidth that a policy route is
not using) among the policy routes that require more bandwidth.
When you enable maximize bandwidth usage, the ZyWALL first makes sure that each policy route
gets up to its bandwidth allotment. Next, the ZyWALL divides up 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.
Table 71 Assured Forwarding (AF) Behavior Group
CLASS 1 CLASS 2 CLASS 3 CLASS 4
Low Drop Precedence AF11 (10) AF21 (18) AF31 (26) AF41 (34)
Medium Drop Precedence AF12 (12) AF22 (20) AF32 (28) AF42 (36)
High Drop Precedence AF13 (14) AF23 (22) AF33 (30) AF43 (38)