Nomadix AG 2300, User Manual, Page: 22 / 294

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Introduction 10
Class Priority Minimum Maximum User Bandwidth Limit**
Conference 1 30 Mbps 100 Mbps 5 Mbps
Guest Room 2 50 Mbps 100 Mbps 5 Mbps
Public 3 20 Mbps 100 Mbps 3 Mbps
User Bandwidth Limit is not an attribute of Class Based Queueing, but can be
applied (if desired) using existing Bandwidth Limit functionality.
The sum of minimums across all classes should not exceed the total available bandwidth.
It is generally recommended to set the Maximum to equal the total available bandwidth across all classes. This
allows all classes to take advantage of the full bandwidth when there is no contention.
With the above configuration, each of the three classes may utilize the entire available bandwidth when there
is no contention. But whenever contention occurs, bandwidth will be allocated according to priority and
minimum guarantee.
For example, if there are no users in the Conference Class, then the Guest Room and Public Classes can use
100% of the bandwidth. If there is contention between the two, then the Guest Room class will be allocated up
to 80Mbps (because it has a higher priority), with 20Mbps taken by the Public class (its minimum guarantee).
If, however, there were no users in the Public class, then the Guest Room class could take 100% of the
bandwidth (100Mbps).
If users are introduced into the Conference class (Priority 1), and this creates contention, then they will take
bandwidth away from each of the other two classes until each reaches its minimum.
Example Illustration of Class-Based Queueing
The following diagram demonstrates the effect of Class Based Queueing with a saturated link of 200Mbps,
and three classes defined with minimum guarantees of 100Mbps (Meeting Room), 60Mpbs (VIP Guests), and
40Mbps (Lobby).
Note the following over time:
 When only Lobby class subscribers are on the network, all available bandwidth is allocated to Lobby
class subscribers.

As VIP Guests join the network, bandwidth is allocated from Lobby class to VIP Guests, until the
Lobby bandwidth drops to its minimum guarantee of 40Mbps.
 As Meeting Room subscribers join the network, the Lobby bandwidth is already at its minimum
guarantee. Bandwidth is allocated from VIP Guests to Meeting Room subscribers, until bandwidth
for VIP Guests reaches the minimum guarantee of 60Mbps and Meeting Room reaches its minimum
guarantee of 100Mbps.