Concept Guide

Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
After you congure a unicast queue as strict-priority, that particular queue, on the entire chassis, is treated as a
strict-priority queue. Trac for a strict priority is scheduled before any other queues are serviced. For
example, if you send 100% line rate trac over the SP queue, it starves all other queues on the ports on which this
trac is owing. To assign the strict priority schedule type to egress queues, use the scheduler strict
command in QOS-POLICY-OUT mode. The system OS does not support bandwidth conguration on strict priority
scheduler queues.
When you enable ETS, the egress QoS features in the output QoS policy-map (such as strict priority
unicast <0-3> and scheduler strict), default scheduler for egress queues are superseded by ETS
congurations. This is to provide compatibility with DCBX. Therefore, Dell Networking OS recommends disabling
ETS when you wish to apply these features exclusively. After you disable ETS on an interface, the congured
parameters are applied.
Policy-Based QoS Commands
Policy-based QoS is not supported on logical interfaces, such as port-channels, VLANs, or Loopbacks.
The commands are:
• show qos dcb-map
• show qos dot1p-queue-mapping
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 weight to the class/queue. The range is from 1 to
100% (granularity 1%).
Defaults none
Command Modes CONFIGURATION (conf-qos-policy-out)
Supported Modes Programmable-Mux (PMUX)
Full-Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.4(0.0) Supported on the FN I/O Aggregator.
9.2(0.0) Introduced on the M I/O Aggregator.
1072 Quality of Service (QoS)