ZyXEL Communications P-2602 Manuel D’Utilisation

P-2602H(W)(L)-DxA Series User’s Guide

Chapter 19 Bandwidth Management

257

• 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. 

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. 

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.   

Click Advanced > Bandwidth MGMT to open the screen as shown next. 

Table 99   Fairness-based Allotment of Unused and Unbudgeted Bandwidth Example

Root Class: 10240 kbps

Administration: 1024 kbps

Sales: 3072 kbps

Marketing: 3072 kbps

Research: 3072 kbps

Table 100   Bandwidth Management Priorities

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.