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| Sun Ethernet Fabric Operating System ### QoS Administration Guide

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### QoS Management Architecture

The QoS management architectures in the SEFOS hardware are based on the IETF Differentiated Service Architecture. However, in this architecture, routing and forwarding are decoupled from the QoS configuration.

There are three logical steps to configuring the switch:

- Classifying and conditioning the ingress traffic of interest

- Configuring the egress port queuing and scheduling

- Mapping the ingress traffic to egress queues

This illustration shows the order of the scripts to be entered.

The following illustration shows a Layer 2 network. There are four down-stream ports and one up-link port. The traffic should be separated into different queues on the up-link. IP traffic from port 0/2 is separated into two classes: one for UDP packets and one for TCP packets. At port 0/3, VLAN 1000 frames are grouped into one class. At port 0/4, the priority of VLAN frames is changed to 3. But, in this example, the egress queue is different than the default queue for priority 3.

The layer 2 network is configured by the following commands:

    SEFOS# configure terminal
    SEFOS(config)# vlan 1000
    SEFOS(config-vlan)# ports extreme-ethernet 0/1-5
    SEFOS(config-vlan)# exit
    SEFOS(config)# no shutdown qos
    SEFOS(config)# qos enable
    SEFOS(config)# exit
    SEFOS# show qos global info
    QoS Global Information
    ----------------------
    System Control       : Start
    System Status        : Enable
    Rate Unit            : kbps

    Rate Granularity     : 64
    Trace Flag           : 0

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