Service Manual

queues are superseded by ETS configurations. 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 configured parameters are applied.
strict-priority unicast
Configure a unicast queue as a strict-priority (SP) queue.
Syntax
strict-priority unicast queue number
Parameters
unicast number Enter the keyword unicast then the queue number. The range is from 1 to 3.
Defaults none
Command Modes CONFIGURATION
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 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. 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 configuration 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 and scheduler strict), default scheduler for egress queues are superseded by ETS
configurations. 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 configured
parameters are applied.
Policy-Based QoS Commands
Policy-based traffic classification is handled with class maps. These maps classify unicast traffic into one of four classes. The system
allows 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.
Quality of Service (QoS) 1003