Alcatel-Lucent 6850-48 ネットワークガイド
Configuring QoS
QoS Ports and Queues
OmniSwitch AOS Release 6 Network Configuration Guide
September 2009
page 40-25
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.
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.
6800.
• DRR—All queues participate in a deficit round robin scheme. Traffic is serviced from each queue
based on the weight of the queue. Note that the DRR scheme is not supported on the OmniSwitch
6800.
6800.
The weight of each of the WRR/DRR queues is a configurable value. Use the following guidelines to
configure WRR/DRR queue weights:
configure 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.
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.
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.
Priority to Queue Mapping Table
802.1p
ToS/DSCP
Rule(action)
Priority
OS6400/6850/
6855/9000
Queue
OS6800 Queue
0
000xxx
0
0
0
1
001xxx
1
1
0
2
010xxx
2
2
1
3
011xxx
3
3
2
4
100xxx
4
4
3
5
101xxx
5
5
4
6
110xxx
6
6
5
7
111xxx
7
7
5