Configuring Queuing Schemes - Alcatel-Lucent OmniSwitch 6800 Series Network Configuration Manual

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Configuring QoS

Priority to Queue Mapping Table

Configuring Queuing Schemes

There are four queuing schemes available for each switch port: one strict priority scheme and three

weighted fair queuing (WFQ) schemes. By default the strict priority scheme is used and consists of eight

priority queues (SPQ). All eight queues on the port are serviced strictly by priority. Lower priority traffic

is dropped in the presence of higher priority traffic.

The following WFQ schemes are available:

WRR—All queues participate in a weighted round robin scheme. Traffic is serviced from each queue

based on the weight of the queue. Note that the WRR scheme is not supported on the OmniSwitch

6800, 9700, or 9800.

Priority-WRR—A type of WRR scheme that combines Strict-Priority queues (zero weight) and WRR

queues (non-zero weight). Note that Priority-WRR is the only WFQ scheme supported on the

OmniSwitch 6800.

DRR—All queues participate in a deficit round robin scheme. Traffic is serviced from each queue

based on the weight of the queue.

The weight of each of the WRR/DRR queues is a configurable value. Note the following when configur-

ing WRR/DRR queue weights:

Weights are configured with a value between 0 and 15. The default weight for each WRR/DRR queue

is set to one. Each queue can have a different weight value, and configuring these values in ascending

or descending order is not required. When a queue is given a weight of 0, it is configured as a Strict-

Priority queue.

The CLI requires the user to enter eight queue weights on the OmniSwitch 6800, even though there are

only six queues per port available on this switch. The last two weight values entered are ignored.

A Priority-WRR scheme is configured by assigning a weight of zero to one or more WRR queues to

make them Strict-Priority queues and a non-zero weight to the other WRR queues. Note that a Priority-

WRR scheme is the only WFQ scheme that is supported on the OmniSwitch 6800.

If there are multiple SPQs configured, the SPQs are scheduled according to their CoS queue number

before any WFQs are scheduled.

OmniSwitch 6800/6850/9000 Network Configuration Guide

Rule(action)

QoS Ports and Queues