P-2302HW/HWL-P1 Series User’s Guide

17.1.8.1 Bandwidth Borrowing Example

Here is an example of bandwidth management with classes configured for bandwidth borrowing. The classes are set up based on departments and individuals within certain departments.

Table 89 Bandwidth Borrowing Example

BANDWIDTH CLASSES AND BANDWIDTH BORROWING SETTINGS

Root Class:

Administration: Borrowing Enabled

 

 

 

Sales: Borrowing Disabled

 

 

 

Marketing: Borrowing Enabled

 

 

 

Research: Borrowing Enabled

 

 

•The Sales class cannot borrow unused bandwidth from the Root class because the Sales class has bandwidth borrowing disabled.

17.1.8.2Maximize Bandwidth Usage With Bandwidth Borrowing

If you configure both maximize bandwidth usage (on the interface) and bandwidth borrowing (on individual sub-classes), the ZyXEL Device functions as follows.

1The ZyXEL Device sends traffic according to each bandwidth class’s bandwidth budget.

2The ZyXEL Device assigns a parent class’s unused bandwidth to its sub-classes that have more traffic than their budgets and have bandwidth borrowing enabled. The ZyXEL Device gives priority to sub-classes of higher priority and treats classes of the same priority equally.

3The ZyXEL Device assigns any remaining unused or unbudgeted bandwidth on the interface to any class that requires it. The ZyXEL Device gives priority to classes of higher priority and treats classes of the same level equally.

4If the bandwidth requirements of all of the traffic classes are met and there is still some unbudgeted bandwidth, the ZyXEL Device assigns it to traffic that does not match any of the classes.

17.1.9Over Allotment of Bandwidth

You can set the bandwidth management speed for an interface higher than the interface’s actual transmission speed. Higher priority traffic gets to use up to its allocated bandwidth, even if it takes up all of the interface’s available bandwidth. This could stop lower priority traffic from being sent. The following is an example.

Table 90 Over Allotment of Bandwidth Example

BANDWIDTH CLASSES, ALLOTMENTS

PRIORITIES

 

 

Actual outgoing bandwidth available on the interface: 1000 kbps

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Chapter 17 Bandwidth MGMT