ZyXEL p-2302hw-p1 Manual Do Utilizador

P-2302HW/HWL-P1 Series User’s Guide

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Chapter 17 Bandwidth MGMT

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.

• The Sales class cannot borrow unused bandwidth from the Root class because the Sales 

class has bandwidth borrowing disabled.

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

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

2 The 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.

3 The 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.

4 If 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.

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 89   Bandwidth Borrowing Example

Root Class: 

Administration: Borrowing Enabled

Sales: Borrowing Disabled

Marketing: Borrowing Enabled

Research: Borrowing Enabled

Table 90   Over Allotment of Bandwidth Example

Actual outgoing bandwidth available on the interface: 1000 kbps