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Page 256 / 427 Scroll up to view Page 251 - 255
P-2602H(W)(L)-DxA Series User’s Guide
256
Chapter 19 Bandwidth Management
19.6.2
Maximize Bandwidth Usage Example
Here is an example of a ZyXEL Device that has maximize bandwidth usage enabled on an
interface. The following table shows each bandwidth class’s bandwidth budget. The classes
are set up based on subnets. The interface is set to 10240 kbps. Each subnet is allocated 2048
kbps. The unbudgeted 2048 kbps allows traffic not defined in any of the bandwidth filters to
go out when you do not select the maximize bandwidth option.
The ZyXEL Device divides up the unbudgeted 2048 kbps among the classes that require more
bandwidth. If the administration department only uses 1024 kbps of the budgeted 2048 kbps,
the ZyXEL Device also divides the remaining 1024 kbps among the classes that require more
bandwidth. Therefore, the ZyXEL Device divides a total of 3072 kbps of unbudgeted and
unused bandwidth among the classes that require more bandwidth.
19.6.2.1
Priority-based Allotment of Unused and Unbudgeted Bandwidth
The following table shows the priorities of the bandwidth classes and the amount of bandwidth
that each class gets.
Suppose that all of the classes except for the administration class need more bandwidth.
•
Each class gets up to its budgeted bandwidth. The administration class only uses 1024
kbps of its budgeted 2048 kbps.
•
The sales and marketing are first to get extra bandwidth because they have the highest
priority (6). If they each require 1536 kbps or more of extra bandwidth, the ZyXEL
Device divides the total 3072 kbps total of unbudgeted and unused bandwidth equally
between the sales and marketing departments (1536 kbps extra to each for a total of 3584
kbps for each) because they both have the highest priority level.
Table 97
Maximize Bandwidth Usage Example
BANDWIDTH CLASSES AND ALLOTMENTS
Root Class: 10240 kbps
Administration: 2048 kbps
Sales: 2048 kbps
Marketing: 2048 kbps
Research: 2048 kbps
Table 98
Priority-based Allotment of Unused and Unbudgeted Bandwidth Example
BANDWIDTH CLASSES, PRIORITIES AND ALLOTMENTS
Root Class: 10240 kbps
Administration: Priority 4, 1024 kbps
Sales: Priority 6, 3584 kbps
Marketing: Priority 6, 3584 kbps
Research: Priority 5, 2048 kbps
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Chapter 19 Bandwidth Management
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•
Research requires more bandwidth but only gets its budgeted 2048 kbps because all of the
unbudgeted and unused bandwidth goes to the higher priority sales and marketing
classes.
19.6.2.2
Fairness-based Allotment of Unused and Unbudgeted Bandwidth
The following table shows the amount of bandwidth that each class gets.
Suppose that all of the classes except for the administration class need more bandwidth.
•
Each class gets up to its budgeted bandwidth. The administration class only uses 1024
kbps of its budgeted 2048 kbps.
•
The ZyXEL Device divides the total 3072 kbps total of unbudgeted and unused
bandwidth equally among the other classes. 1024 kbps extra goes to each so the other
classes each get a total of 3072 kbps.
19.6.3
Bandwidth Management Priorities
Traffic with a higher priority gets through faster while traffic with a lower priority is dropped
if the network is congested. The following table describes the priorities that you can apply to
traffic that the ZyXEL Device forwards out through an interface.
19.7
Configuring Summary
Click
Advanced > Bandwidth MGMT
to open the screen as shown next.
Table 99
Fairness-based Allotment of Unused and Unbudgeted Bandwidth Example
BANDWIDTH CLASSES AND ALLOTMENTS
Root Class: 10240 kbps
Administration: 1024 kbps
Sales: 3072 kbps
Marketing: 3072 kbps
Research: 3072 kbps
Table 100
Bandwidth Management Priorities
PRIORITY
DESCRIPTION
High
Typically used for voice traffic or video that is especially sensitive to jitter (jitter is the
variations in delay).
Mid
Typically used for “excellent effort” or better than best effort and would include important
business traffic that can tolerate some delay.
Low
This is typically used for non-critical “background” traffic such as bulk transfers that are
allowed but that should not affect other applications and users.
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Chapter 19 Bandwidth Management
Enable bandwidth management on an interface and set the maximum allowed bandwidth for
that interface.
Figure 136
Bandwidth Management: Summary
The following table describes the labels in this screen.
Table 101
Media Bandwidth Management: Summary
LABEL
DESCRIPTION
Interface
These read-only labels represent the physical interfaces. Select an interface’s check
box to enable bandwidth management on that interface. Bandwidth management
applies to all traffic flowing out of the router through the interface, regardless of the
traffic’s source.
Traffic redirect or IP alias may cause LAN-to-LAN traffic to pass through the ZyXEL
Device and be managed by bandwidth management.
Active
Select an interface’s check box to enable bandwidth management on that interface.
Speed
(kbps)
Enter the amount of bandwidth for this interface that you want to allocate using
bandwidth management.
This appears as the bandwidth budget of the interface’s root class. The
recommendation is to set this speed to match the interface’s actual transmission speed.
For example, set the WAN interface speed to 1000 kbps if your Internet connection has
an upstream transmission speed of 1 Mbps.
If this number is higher than the interface’s actual transmission speed, and you
configure bandwidth rules for all of the bandwidth, higher priority traffic could use all of
the bandwidth so lower priority traffic does not get through.
Note:
Unless you enable
Max Bandwidth Usage
, the ZyXEL Device
only uses up to the amount of bandwidth that you configure here.
The ZyXEL Device does not use any more bandwidth for the
interface’s connections, even if the interface has more outgoing
bandwidth.
Scheduler
Select either
Priority-Based
or
Fairness-Based
from the drop-down menu to control
the traffic flow.
Select
Priority-Based
to give preference to bandwidth classes with higher priorities.
Select
Fairness-Based
to treat all bandwidth classes equally.
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Chapter 19 Bandwidth Management
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19.8
Bandwidth Management Rule Setup
You must use the
Bandwidth Management Summary
screen to enable bandwidth
management on an interface before you can configure rules for that interface.
Click
Advanced > Bandwidth MGMT > Rule Setup
to open the following screen.
Figure 137
Bandwidth Management: Rule Setup
The following table describes the labels in this screen.
Max
Bandwidth
Usage
Select this check box to have the ZyXEL Device divide up all of the interface’s
unallocated and/or unused bandwidth among the bandwidth classes that require
bandwidth. Do not select this if you want to reserve bandwidth for traffic that does not
match a bandwidth class or you want to limit the transmission speed of this interface
(see the
Speed
field description).
Apply
Click
Apply
to save your settings back to the ZyXEL Device.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 101
Media Bandwidth Management: Summary (continued)
LABEL
DESCRIPTION
Table 102
Bandwidth Management: Rule Setup
LABEL
DESCRIPTION
Direction
Select
LAN
to apply bandwidth management to traffic that the ZyXEL Device
forwards to the LAN.
Select
WAN
to apply bandwidth management to traffic that the ZyXEL Device
forwards to the WAN.
Select
WLAN
to apply bandwidth management to traffic that the ZyXEL Device
forwards to the WLAN.
Service
Select a service for your rule or you can select
User define
to go to the screen
where you can define your own.
Priority
Select a priority from the drop down list box. Choose
High
,
Mid
or
Low
.
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Chapter 19 Bandwidth Management
19.8.1
Rule Configuration
Click the
Edit
icon or
User define
in the
Service
field to configure a bandwidth management
rule. Use bandwidth rules to allocate specific amounts of bandwidth capacity (bandwidth
budgets) to specific applications and/or subnets.
Figure 138
Bandwidth Management Rule Configuration
Bandwidth (kbps)
Specify the maximum bandwidth allowed for the rule in kbps. The
recommendation is a setting between 20 kbps and 20000 kbps for an individual
rule.
If you want to leave some bandwidth for traffic that does not match a bandwidth
filter, make sure that the interface’s root class has more bandwidth than the sum
of the bandwidths of the interface’s bandwidth management rules.
Add
Click this button to save your rule. It displays in the following table.
#
This is the number of an individual bandwidth management rule.
Rule Name
This is the name of the rule.
Destination Port
This is the port number of the destination. 0 means any destination port.
Priority
This is the priority of this rule.
Bandwidth (kbps)
This is the maximum bandwidth allowed for the rule in kbps.
Modify
Click the Edit icon to go to the screen where you can edit the rule.
Click the Remove icon to delete an existing rule.
Apply
Click
Apply
to save your changes back to the ZyXEL Device.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 102
Bandwidth Management: Rule Setup (continued)
LABEL
DESCRIPTION

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