ZyXEL Communications ZYWALL USG 20 Manual page 465

Table 132
LABEL
Inbound
kbps
Outbound
kbps
Priority
Maximize
Bandwidth
Usage
OK
Cancel
ZyWALL USG 20/20W User's Guide
Configuration > Bandwidth Management
DESCRIPTION
Type how much inbound bandwidth, in kilobits per second, this policy
allows the traffic to use. Inbound refers to the traffic the ZyWALL sends
to a connection's initiator.
If you enter 0 here, this policy does not apply bandwidth management
for the matching traffic that the ZyWALL sends to the initiator. Traffic
with bandwidth management disabled (inbound and outbound are both
set to 0) is automatically treated as the lowest priority (7).
If the sum of the bandwidths for routes using the same next hop is
higher than the actual transmission speed, lower priority traffic may not
be sent if higher priority traffic uses all of the actual bandwidth.
Type how much outbound bandwidth, in kilobits per second, this policy
allows the traffic to use. Outbound refers to the traffic the ZyWALL sends
out from a connection's initiator.
If you enter 0 here, this policy does not apply bandwidth management
for the matching traffic that the ZyWALL sends out from the initiator.
Traffic with bandwidth management disabled (inbound and outbound are
both set to 0) is automatically treated as the lowest priority (7).
If the sum of the bandwidths for routes using the same next hop is
higher than the actual transmission speed, lower priority traffic may not
be sent if higher priority traffic uses all of the actual bandwidth.
This field displays when the inbound or outbound bandwidth
management is not set to 0. Enter a number between 1 and 7 to set the
priority for traffic that matches this policy. The smaller the number, the
higher the priority.
Traffic with a higher priority is given bandwidth before traffic with a
lower priority.
The ZyWALL uses a fairness-based (round-robin) scheduler to divide
bandwidth between traffic flows with the same priority.
The number in this field is ignored if the incoming and outgoing limits
are both set to 0. In this case the traffic is automatically treated as being
set to the lowest priority (7) regardless of this field's configuration.
This field displays when the inbound or outbound bandwidth
management is not set to 0. Enable maximize bandwidth usage to let
the traffic matching this policy "borrow" any unused bandwidth on the
out-going interface.
After each application or type of traffic gets its configured bandwidth
rate, the ZyWALL uses the fairness- based scheduler to divide any
unused bandwidth on the out-going interface amongst applications and
traffic types that need more bandwidth and have maximize bandwidth
usage enabled.
Click OK to save your changes back to the ZyWALL.
Click Cancel to exit this screen without saving your changes.
Chapter 28 Bandwidth Management
465