ZyXEL UAG4100 User Guide - Page 370
The Bandwidth Management Screen
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Chapter 31 Bandwidth Management Maximize Bandwidth Usage Effect With maximize bandwidth usage enabled, after each server gets its configured rate, the rest of the available bandwidth is divided equally between the two. So server A gets its configured rate of 300 kbps and server B gets its configured rate of 200 kbps. Then the UAG divides the remaining bandwidth (1000 - 500 = 500) equally between the two (500 / 2 = 250 kbps for each). The priority has no effect on how much of the unused bandwidth each server gets. So server A gets its configured rate of 300 kbps plus 250 kbps for a total of 550 kbps. Server B gets its configured rate of 200 kbps plus 250 kbps for a total of 450 kbps. Table 163 Maximize Bandwidth Usage Effect POLICY CONFIGURED RATE MAX. B. U. A 300 kbps Yes B 200 kbps Yes PRIORITY 1 2 ACTUAL RATE 550 kbps 450 kbps Priority and Over Allotment of Bandwidth Effect Server A has a configured rate that equals the total amount of available bandwidth and a higher priority. You should regard extreme over allotment of traffic with different priorities (as shown here) as a configuration error. Even though the UAG still attempts to let all traffic get through and not be lost, regardless of its priority, server B gets almost no bandwidth with this configuration. Table 164 Priority and Over Allotment of Bandwidth Effect POLICY CONFIGURED RATE MAX. B. U. PRIORITY A 1000 kbps Yes 1 B 1000 kbps Yes 2 ACTUAL RATE 999 kbps 1 kbps Finding Out More • See DSCP Marking and Per-Hop Behavior on page 205 for a description of DSCP marking. 31.2 The Bandwidth Management Screen The Bandwidth management screens control the bandwidth allocation for TCP and UDP traffic. You can use source interface, destination interface, destination port, schedule, user, source, destination information, DSCP code and service type as criteria to create a sequence of specific conditions, similar to the sequence of security policies, to specify how the UAG handles the DSCP value and allocate bandwidth for the matching packets. Click Configuration > BWM to open the following screen. This screen allows you to enable/disable bandwidth management and add, edit, and remove user-defined bandwidth management policies. The default bandwidth management policy is the one with the priority of "default". It is the last policy the UAG checks if traffic does not match any other bandwidth management policies you have configured. You cannot remove, activate, deactivate or move the default bandwidth management policy. UAG Series User's Guide 370