Introduction to MQC

MQC Entities

MQC involves three entities: traffic classifier, traffic behavior, and traffic policy.

• Traffic classifier

  A traffic classifier defines a group of matching rules to classify packets. Table 1-1 lists traffic classification rules.

  Table 1-1  Traffic classification rules

  Layer	Traffic Classification Rule
  Layer 2	Destination MAC address Source MAC address VLAN ID in the outer tag of a QinQ packet 802.1p priority in the outer tag of a QinQ packet VLAN ID in the inner tag of a QinQ packet 802.1p priority in the inner tag of a QinQ packet Protocol field encapsulated based on Layer 2 information Matching fields in ACL 4000 to ACL 4999
  Layer 3	DSCP priority in IP packets IP precedence in IP packets IP protocol type (IPv4 or IPv6) TCP-flag in TCP packets Matching fields in ACL 2000 to ACL 3999 Matching fields in ACL6 2000 to ACL6 3999
  Others	All packets Inbound interface Outbound interface Matching fields in ACL 5000 to ACL 5999 (user-defined ACLs)

  The relationship between rules in a traffic classifier can be AND or OR. By default, the relationship between rules in a traffic classifier is AND.

  • AND: If a traffic classifier contains ACL rules, packets match the traffic classifier only when the packets match one ACL rule and all the non-ACL rules. If a traffic classifier does not contain ACL rules, packets match the traffic classifier only when the packets match all the non-ACL rules.

  • OR: Packets match a traffic classifier as long as they match one of rules.

• Traffic behavior

  A traffic behavior defines an action for packets of a specified type.

• Traffic policy

  A traffic policy is a QoS policy configured by binding traffic classifiers to traffic behaviors. As shown in Figure 1-1, a traffic policy can be bound to multiple pairs of traffic classifiers and traffic behaviors.

  Figure 1-1  Binding a traffic policy to multiple pairs of traffic classifiers and traffic behaviors
  

MQC Configuration Process

Figure 1-2 shows the MQC configuration process.

1. Configure a traffic classifier. The traffic classifier defines a group of matching rules to classify traffic and is the basis for providing differentiated services.

2. Configure a traffic behavior. The traffic behavior defines a flow control or resource allocation action for packets matching rules.

3. Configure a traffic policy. A traffic policy is configured by binding traffic classifiers to traffic behaviors.

4. Apply the traffic policy to the system (system, interface, or VLAN)

Figure 1-2  MQC configuration process