Users Guide

Usage Information
After you configure a unicast queue as strict-priority, that particular queue, on the entire chassis, is treated as a
strict-priority queue. Traffic for a strict priority is scheduled before any other queues are serviced. For
example, if you send 100% line rate traffic over the SP queue, it starves all other queues on the ports on which
this traffic is flowing.
Policy-Based QoS Commands
Policy-based traffic classification is handled with class maps. These maps classify data traffic into one of eight classes . Dell Networking
OS enables you to match multiple class maps and specify multiple match criteria. Policy-based QoS is not supported on logical interfaces,
such as port-channels, VLANS, or loopbacks.
bandwidth-percentage
Assign a percentage of weight to the class/queue.
Syntax
bandwidth-percentage percentage
To remove the bandwidth percentage, use the no bandwidth-percentage command.
Parameters
percentage Enter the percentage assignment of bandwidth to the class/queue. The range is from 1 to
100% (granularity 1%).
Defaults none
Command Modes CONFIGURATION (conf-qos-policy-out)
Command History
This guide is platform-specific. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100-ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.1.9.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
6.2.1.1 Introduced on the E-Series.
Usage Information
The unit of bandwidth percentage is 1%. If the sum of the bandwidth percentages given to all eight classes
exceeds 100%, the bandwidth percentage automatically scales down to 100%.
Related
Commands
• qos-policy-output — creates a QoS output policy.
class-map
Create/access a class map. Class maps differentiate traffic so that you can apply separate quality-of-service policies to each class.
Syntax
class-map {match-all | match-any} class-map-name [cpu-qos] [layer2]
Quality of Service (QoS) 1069