Overview of 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 tag of VLAN-tagged packets 802.1p priority in the tag of VLAN-tagged packets VLAN ID in the inner tag of VLAN packets 802.1p priority in the inner tag of QinQ packets Protocol field in the Layer 2 header Discard Eligible (DE) value in Frame Relay (FR) packets Data Link Connection Identifier (DLCI) in Frame Relay (FR) packets Permanent virtual circuit (PVC) information in ATM packets Matching fields in access control list (ACL) 4000 to ACL 4999
  Layer 3	Differentiated Services Code Point (DSCP) priority in IP packets IP precedence in IP packets IP protocol type (IPv4 or IPv6) RTP port number TCP-flag in TCP packets IPv4 packet length QoS group in an IPSec policy Matching fields in ACL 2000 to ACL 3999 Matching fields in ACL6 2000 to ACL6 3999
  Others	All packets Inbound interface Outbound interface SAC User group

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

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

  • OR: A packet matches a traffic classifier as long as it matches one of rules.

• Traffic behavior

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

• Traffic policy

  A traffic policy binds traffic classifiers and traffic behaviors, and then actions defined in traffic behaviors are taken for classified packets. As shown in Figure 1-1, a traffic policy can be bound to multiple traffic classifiers and traffic behaviors.

  Figure 1-1 Multiple pairs of traffic classifiers and traffic behaviors in a traffic policy
  

MQC Configuration Process

Figure 1-2 outlines 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 differentiated services.

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

3. Create a traffic policy and bind the traffic classifier to the traffic behavior in the traffic policy.

4. Apply the traffic policy to an interface or sub-interface.

Figure 1-2 MQC configuration process