Enabling Qos Rate Adjustment; Enabling Strict-Priority Queueing - Dell Z9500 Configuration Manual

interface: Enter the name of the interface that has the color policy configured.
Examples for Displaying a DSCP Color Policy
Display summary information about a color policy for one or more interfaces.
Display summary information about a color policy for a specific interface.
Display detailed information about a color policy for a specific interface

Enabling QoS Rate Adjustment

By default while rate limiting, policing, and shaping, Dell Networking OS does not include the Preamble, SFD, or the IFG fields.
These fields are overhead; only the fields from MAC destination address to the CRC are used for forwarding and are included in
these rate metering calculations.
The Ethernet packet format consists of:
• Preamble: 7 bytes Preamble
• Start frame delimiter (SFD): 1 byte
• Destination MAC address: 6 bytes
• Source MAC address: 6 bytes
• Ethernet Type/Length: 2 bytes
• Payload: (variable)
• Cyclic redundancy check (CRC): 4 bytes
• Inter-frame gap (IFG): (variable)
You can optionally include overhead fields in rate metering calculations by enabling QoS rate adjustment.
QoS rate adjustment is disabled by default.
• Specify the number of bytes of packet overhead to include in rate limiting, policing, and shaping calculations.
CONFIGURATION mode
qos-rate-adjust overhead-bytes
For example, to include the Preamble and SFD, type qos-rate-adjust 8. For variable length overhead fields, know the
number of bytes you want to include.
The default is disabled.

Enabling Strict-Priority Queueing

In strict-priority queuing, the system de-queues all packets from the assigned queue before servicing any other queues. You
can assign strict-priority to one unicast queue, using the strict-priority command.
• Policy-based per-queue rate shaping is not supported on the queue configured for strict-priority queuing. To use queue-
based rate-shaping as well as strict-priority queuing at the same time on a queue, use the Scheduler Strict feature as
described in Scheduler Strict .
• The strict-priority supersedes bandwidth-percentage configuration.
• A queue with strict priority can starve other queues in the same port-pipe.
• Assign strict priority to one unicast queue.
CONFIGURATION mode
strict-priority
The range is from 1 to 3.
Quality of Service (QoS) 679