Chapter 26 BWM (Bandwidth Management)
USG20(W)-VPN Series User’s Guide
405
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 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.
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 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.
26.2 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 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 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.
Table 153
Maximize Bandwidth Usage Effect
POLICY
CONFIGURED RATE
MAX. B. U.
PRIORITY
ACTUAL RATE
A
300 kbps
Yes
1
550 kbps
B
200 kbps
Yes
2
450 kbps
Table 154
Priority and Over Allotment of Bandwidth Effect
POLICY
CONFIGURED RATE
MAX. B. U.
PRIORITY
ACTUAL RATE
A
1000 kbps
Yes
1
999 kbps
B
1000 kbps
Yes
2
1 kbps
Summary of Contents for ZyWall USG20-VPN
Page 17: ...17 PART I User s Guide ...
Page 18: ...18 ...
Page 99: ...99 PART II Technical Reference ...
Page 100: ...100 ...