Dell Force10 MXL Blade Reference Manual page 466

Command
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Usage
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strict-priority unicast
Syntax
Parameters
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Command Modes
Command
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Usage
Information
466 | Quality of Service (QoS)
Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module
Guarantee a minimum bandwidth to different queues globally using the command
bandwidth-percentage from CONFIGURATION mode. The DCB ETS supersedes the global and
policy based QoS bandwidth configurations.
When you enable ETS, the egress QoS features in the output QoS policy-map (such as service-class
bandwidth-percentage and bandwidth-percentage), the default bandwidth allocation ratio for
egress queues are superseded by ETS configurations. This is to provide compatibility with DCBX.
Hence, it is recommended to have ETS disabled when you wish to apply these features exclusively.
Once ETS is disabled on an interface, configured parameters will be applied.
Configure a unicast queue as a strict-priority (SP) queue.
strict-priority unicast queue number
unicast number
none
CONFIGURATION
Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module
After a unicast queue is configured as strict-priority, that particular queue, on the entire chassis, is
treated as 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 will starve 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. FTOS does not support
bandwidth configuration on strict priority scheduler queues.
When you enable ETS, 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 and scheduler strict), default scheduler for egress queues are superseded by ETS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. Hence, it is recommended to have the
ETS disabled when you wish to apply these features exclusively. Once ETS disabled on an interface,
configured parameters will be applied.
unicast
Enter the keyword followed by the queue number.
Range: 1 to 3
service-class