The Bandwidth Management Screen - ZyXEL Communications ZyWALL 110 User Manual

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 ZyWALL/USG 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 183 Maximize Bandwidth Usage Effect
POLICY
A
B
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/USG 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 184 Priority and Over Allotment of Bandwidth Effect
POLICY
A
B

27.2 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/USG 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/USG 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.
Chapter 27 BWM (Bandwidth Management)
CONFIGURED RATE
300 kbps
200 kbps
CONFIGURED RATE
1000 kbps
1000 kbps
ZyWALL/USG Series User's Guide
MAX. B. U. PRIORITY
Yes 1
Yes 2
MAX. B. U. PRIORITY
Yes 1
Yes 2
457
ACTUAL RATE
550 kbps
450 kbps
ACTUAL RATE
999 kbps
1 kbps