User's Manual

Chapter 28 Bandwidth Management

ZyWALL USG 20/20W User’s Guide

456

Unused bandwidth is divided equally. Higher priority traffic does not get a larger

portion of the unused bandwidth.

Bandwidth Management Behavior

The following sections show how bandwidth management behaves with various

settings. For example, you configure DMZ to WAN policies for FTP servers A and

B. Each server tries to send 1000 kbps, but the WAN is set to a maximum

outgoing speed of 1000 kbps. You configure policy A for server A’s traffic and

policy B for server B’s traffic.

Figure 280 Bandwidth Management Behavior

Configured Rate Effect

In the following table the configured rates total less than the available bandwidth

and maximize bandwidth usage is disabled, both servers get their configured rate.

Priority Effect

Here the configured rates total more than the available bandwidth. Because server

A has higher priority, it gets up to it’s configured rate (800 kbps), leaving only 200

kbps for server B.

Table 127 Configured Rate Effect

POLICY CONFIGURED RATE MAX. B. U. PRIORITY ACTUAL RATE

A 300 kbps No 1 300 kbps

B 200 kbps No 1 200 kbps

Table 128 Priority Effect

POLICY CONFIGURED RATE MAX. B. U. PRIORITY ACTUAL RATE

A 800 kbps Yes 1 800 kbps

B 1000 kbps Yes 2 200 kbps

1000 kbps

BWM

1000 kbps