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Chapter 25 Bandwidth Management

ZyWALL 110/310/1100 Series User’s Guide

353

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 ZyWALL 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.

Finding Out More

• See

DSCP Marking and Per-Hop Behavior on page 189

for a description of DSCP marking.

25.2 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 rules used by firewalls, to specify how the ZyWALL 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 ZyWALL 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.

Figure 232

Configuration > Bandwidth Management

Table 126

Priority and Over Allotment of Bandwidth Effect

POLICY

CONFIGURED RATE

MAX. B. U.

PRIORITY

ACTUAL RATE

1000 kbps

Yes

999 kbps