ZyXEL Communications P-2302HWL-P1 Series - Manual (Page 210)

P-2302HW/HWL-P1 Series User’s Guide
210 Chapter 17 Bandwidth MGMT
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.
• The Sales class cannot borrow unused bandwidth from the Root class because the Sales
class has bandwidth borrowing disabled.
17.1.8.2 Maximize 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.
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.
17.1.9 Over 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 89 Bandwidth Borrowing Example
BANDWIDTH CLASSES AND BANDWIDTH BORROWING SETTINGS
Root Class: Administration: Borrowing Enabled
Sales: Borrowing Disabled
Marketing: Borrowing Enabled
Research: Borrowing Enabled
Table 90 Over Allotment of Bandwidth Example
BANDWIDTH CLASSES, ALLOTMENTS PRIORITIES
Actual outgoing bandwidth available on the interface: 1000 kbps