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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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Licensing Requirements and Limitations for Traffic Policing, Traffic Shaping, and Interface-based Rate Limiting

Licensing Requirements and Limitations for Traffic Policing, Traffic Shaping, and Interface-based Rate Limiting

Involved Network Elements

Other network elements are not required.

Licensing Requirements

Traffic policing, traffic shaping, and interface-based rate limiting are basic features of a switch and are not under license control.

Version Requirements

Table 4-6 describes the products and versions supporting traffic policing, traffic shaping, and interface-based rate limiting.

Table 4-6  Products and versions supporting traffic policing, traffic shaping, and interface-based rate limiting

Product

Product Model

Software Version

S12700

S12708 and S12712

V200R005C00, V200R006C00, V200R007C00, V200R007C20, V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

S12710

V200R010C00, V200R011C10, V200R012C00, V200R013C00

S12704

V200R008C00, V200R009C00, V200R010C00, V200R011C10, V200R012C00, V200R013C00

NOTE:
For details about software mappings, visit Hardware Query Tool and search for the desired product model.

Feature Limitations

  • To limit the rate of packets from different VLANs, configure rate limiting based on VLAN IDs. When a traffic policy is applied to a VLAN, the traffic policy is valid for all interfaces in the VLAN.
  • After rate limiting is configured on the device, Internet access may be slow and packet loss may occur on the downstream device. The rate limit needs to be set properly.
  • Traffic policing, traffic shaping, and interface-based rate limiting are valid for data packets and protocol packets sent by the local device, and are invalid for protocol packets sent to the CPU.
  • Traffic suppression in a VLAN, inbound interface-based rate limiting, MQC-based traffic policing, and ACL-based traffic-limit share CAR resources of the device. When CAR resources are insufficient, some of the preceding functions may fail to be configured. Run the display acl resource [ slot slot-id ] command to view the usage of CAR resources.
  • The inbound traffic statistics function takes effect before interface-based rate limiting. That is, you cannot check whether interface-based rate limiting takes effect according to the traffic statistics. Run the display qos car statistics interface interface-type interface-number inbound command to view traffic statistics after rate limiting is configured.
  • When traffic policing and another flow action are defined in different traffic behaviors of the same traffic policy and priorities of matching traffic classifiers are different, if packets match multiple traffic classifiers, only the action corresponding to the high-priority traffic classifier takes effect. In this case, rate limiting may fail.
  • Use a traffic policy for rate limiting and apply the traffic policy in the VLAN view:
    • If interfaces in the VLAN reside on the same card, these interfaces share the bandwidth specified by the rate limit.

    • If interfaces in the VLAN reside on different cards, the interfaces on each card share the bandwidth specified by the rate limit.

  • The switch can configure a rate limit for incoming traffic on an Eth-Trunk. The rate limit is configured by using the qos car command. After the rate limit is configured:
    • If the member interfaces of the Eth-Trunk are on different cards, the rate limit applies to each card individually.
    • If the member interfaces of the Eth-Trunk are on the same card, the member interfaces share the bandwidth specified by the rate limit. The bandwidth is distributed on the member interfaces randomly.
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Updated: 2019-01-18

Document ID: EDOC1100038410

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