
Chapter 71 Configuring QoS (Quality of Service) Queuing 699
BCM 4.0 Networking Configuration Guide
QoS accounts
QoS can be assigned to an interface or to a dial-up account. Using the QoS accounts tab, the
administrator can specify the QoS for a group of users, rather then specifying a QoS for an entire
interface. For more information about adding users to an account, see the BCM 4.0 Administration
Guide (N0060598).
Guaranteed Bandwidth (%) <numeric> For the premium service class (queue 1), Guaranteed
Bandwidth represents the percentage of the total available
outbound link speed that can be used for forwarding premium
traffic. Any traffic in excess of this value will be shaped.
For service classes (queue 2 to 7) other than premium,
Guaranteed Bandwidth represents the percentage of the
traffic distribution in the Hierarchical Token Buckets (HTB)
scheduler classes. The Guaranteed Bandwidth percentage
value is based on the remaining unused bandwidth portion of
the premium service class. The sum of percentage values for
queue 2 to 7 must be equal to 100%.
Maximum Bandwidth (%) <numeric> Maximum bandwidth represents the amount of unused
bandwidth that can be borrowed from other queues. It is
represented by a percentage value of the total available
outbound link speed that the interface can use to forward
traffic.
For the premium service class (queue 1), the default value is
set to the Guaranteed bandwidth value. This ensures that
traffic shaping takes place and prevents starvation of other
queues. The unused bandwidth (shaped or not) is given to
the remaining queues of this interface.
For service classes (queue 2 to 7) other than premium, the
default value is set to 100%. This ensures that unused
bandwidth from other queues is used if needed.
The default values on a per-queue basis are follows:
Queue 1: 70%
Queue 2: 100%
Queue 3: 100%
Queue 4: 100%
Queue 5: 100%
Queue 6: 100%
Queue 7: 100%
Table 29 Modifying Queue Settings (Sheet 2 of 2)
Attribute Value Description
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