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Dell PowerConnect 55xx Systems User Guide
Configuring QoS Properties Using CLI Commands
The following table summarizes the CLI commands for configuring fields in
the
QoS Properties: Summary
page.
The following is an example of the CLI command:
Queue
The switch supports eight queues for each interface. Queue number eight is
the highest priority queue. Queue number one is the lowest priority queue.
Traffic Limitation Methods
There are two ways of determining how traffic in queues is handled, Strict
Priority and Weighted Round Robin (WRR):
•
Strict Priority
— Egress traffic from the highest-priority queue is
transmitted first. Traffic from the lower queues is processed only after the
highest queue has been transmitted, thus providing the highest level of
priority of traffic to the lowest-numbered queue.
•
Weighted Round Robin (WRR)
— In WRR mode, the number of packets
sent from the queue is proportional to the weight of the queue (the higher
the weight, the more frames are sent). For example, if all eight queues are
WRR and the default weights are used, queue 1 receives 1/15 of the
bandwidth (assuming all queues are saturated and there is congestion),
queue 2 receives 2/15, queue 3 receives 4/15, and queue 8 receives 8/15 of
the bandwidth. The type of WRR algorithm used in the device is not the
standard Deficit WRR (DWRR), but rather Shaped Deficit WRR
(SDWRR).
Table 22-2. QoS Properties CLI Commands
CLI Command
Description
qos cos default-cos
no qos cos
Defines the default CoS value of a port.
Use the no form of this command to restore the
default configuration.
console(config)#
interface
gi1/0/15
console(config-if)#
qos cos
3
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