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S12700 V200R012C00 Configuration Guide - QoS

This document describes the configurations of QoS functions, including MQC, priority mapping, traffic policing, traffic shaping, interface-based rate limiting, congestion avoidance, congestion management, packet filtering, redirection, traffic statistics, ACL-based simplified traffic policy, and HQoS.
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Overview of MQC

Overview of MQC

Modular QoS Command-Line Interface (MQC) allows you to classify packets based on packet characteristics and specify the same service for packets of the same type. This allows different types of packets to be provided with differentiated services.

As more services are deployed on a network, service deployment becomes increasingly complex because traffic of different services or users requires different services. Using MQC configuration, you can classify network traffic in a fine-grained way and specify the services provided to different types of traffic according to your needs. MQC enhances serviceability of your network.

MQC Entities

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

  • Traffic classifier

    A traffic classifier defines a group of traffic matching rules to classify packets. Table 2-1 lists traffic classification rules.
    Table 2-1  Traffic classification rules
    Layer Traffic Classification Rule
    Layer 2
    • Destination MAC address
    • Source MAC address
    • VLAN ID in the outer tag of VLAN-tagged packets
    • 802.1p priority in the outer tag of VLAN-tagged packets
    • VLAN ID in the inner tag of VLAN-tagged packets
    • 802.1p priority in the inner tag of VLAN-tagged packets
    • Protocol field in the Layer 2 header
    • EXP precedence in MPLS packets
    • Matching fields in ACL 4000 to ACL 4999
    Layer 3
    • DSCP priority in IP packets
    • IP precedence in IP packets
    • Next Header field in the IPv6 packet header
    • 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. The default relationship is OR.
    • AND: If a traffic classifier contains ACL rules, a packet matches the traffic classifier only if 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 if it matches all the rules in the classifier.

    • OR: A packet matches a traffic classifier if it matches one of the 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. In Figure 2-1, a traffic policy can be bound to multiple traffic classifiers and traffic behaviors.
    Figure 2-1  Multiple pairs of traffic classifiers and traffic behaviors in a traffic policy

MQC Configuration Process

Figure 2-2 outlines the MQC configuration process in the following steps:
  1. Configure a traffic classifier. The traffic classifier defines a group of matching rules to classify packets 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 traffic classification rules.

  3. Create a traffic policy and bind specified traffic classifiers and traffic behaviors to it.

  4. Apply the traffic policy to the system, an LPU, an interface, or a VLAN.

Figure 2-2  MQC configuration process

Relevant Information

Technology Forum

QoS Issues - Issue 2 QoS Implementation - MQC

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Updated: 2019-01-18

Document ID: EDOC1100038410

Views: 17820

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