Predefined classes, traffic behaviors, and policies

The system predefines the following classes, traffic behaviors, and policies:

The system predefines some classes and defines general rules for them. You can use these predefined classes when defining a policy.

• The default class

  default-class—Matches the default traffic.

• DSCP-based predefined classes

  ef, af1, af2, af3, af4—Matches IP DSCP value ef, af1, af2, af3, af4, respectively.

• IP precedence-based predefined classes

  ip-prec0, ip-prec1, …ip-prec7—Matches IP precedence value 0, 1, …7, respectively.

• MPLS EXP-based predefined classes

  mpls-exp0, mpls-exp1, …mpls-exp7—Matches MPLS EXP value 0, 1, …7, respectively.

The system predefines some traffic behaviors and defines QoS features for them.

• ef—Assigns a class of packets to the EF queue and assigns 20% of the available interface/PVC bandwidth to the class of packets.

• af—Assigns a class of packets to the AF queue and assigns 20% of the available interface/PVC bandwidth to the class of packets.

• be—Defines no features.

• be-flow-based—Assigns a class of packets to a WFQ queue and specifies the drop policy as WRED. By default, 256 WFQ queues exist, and WRED is an IP precedence-based drop policy.

The system predefines a QoS policy, specifies a predefined class for the policy and associates a predefined behavior with the class. The policy is named default, with the default CBQ action.

The policy default is defined as follows:

• Associates the predefined class ef with the predefined traffic behavior ef.

• Associates predefined classes af1 through af4 with the predefined traffic behavior af.

• Associates the predefined class default-class with the predefined traffic behavior be.