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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.
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Introduction
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