ZyXEL Communications P-660HW-D Series - Manual (Page 189)

P-660HW-D Series User’s Guide
Chapter 13 Bandwidth Management 188
• 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.
13.6.2.2 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.
13.6.3 Bandwidth Management Priorities
The following table describes the priorities that you can apply to traffic that the ZyXEL device
forwards out through an interface.
Table 72 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 73 Bandwidth Management Priorities
PRIORITY LEVELS: TRAFFIC WITH A HIGHER PRIORITY GETS THROUGH FASTER WHILE
TRAFFIC WITH A LOWER PRIORITY IS DROPPED IF THE NETWORK IS CONGESTED.
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.