Configuring Class-Based Queuing - 3Com MSR 50 Series Configuration Manual

Configuring
Class-based Queuing
The class-based queuing CBQ configuration includes:
1 Configure the maximum available bandwidth on the interface
2 Define the class and define a group of traffic classification rules in the class view.
3 Define traffic behavior, and define a group of QoS features in the traffic behavior
view.
4 Define the policy, and define the corresponding traffic behavior for the class in use
in the policy view.
5 Apply QoS policy in the interface or ATM PVC view.
The system pre-defines some classes, traffic behaviors and policies. The detailed
description is given below.
Pre-defined classes
The system pre-defines some classes and defines general rules for them. The user
can use the pre-defined classes when defining the policy.
1 Default class:
default-class: matching the default data flow.
2 DSCP-based pre-defined class:
ef, af1, af2, af3, af4: matching IP DSCP values of ef, af1, af2, af3, af4 respectively.
3 IP priority-based pre-defined class:
ip-prec0, ip-prec1, ip-prec7: matching IP priorities of 0, 1, and 7 respectively.
4 MPLS EXP-based pre-defined class:
mpls-exp0, mpls-exp1, ...mpls-exp7: matching MPLS EXP values of 0, 1, ...7.
Pre-defined traffic behaviors
The system pre-defines some traffic behaviors and defines QoS features for them.
ef: Defines a feature of input EF queue, occupying 20% of the available
■
bandwidth of the interface.
af: Defines a feature of input AF queue, occupying 20% of the available
■
bandwidth of the interface.
be: Defines no features.
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Pre-defined policies
The system pre-defines a policy, and specifies the pre-defined class for the policy
and specifies the pre-defined behavior for the class. The policy is named default,
with the default CBQ behavior.
The detailed rules of the default policy are as follows.
Pre-defined class ef, adopting pre-defined traffic behavior of ef.
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Pre-defined classes af1 to af4, adopting pre-defined traffic behavior of af.
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Configuring Class-based Queuing

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