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