Administrator Guide

Display summary information about a color policy for one or more interfaces.
Dell# show qos dscp-color-policy summary
Interface dscp-color-map
TE 0/10 mapONE
TE0/11 mapTWO
Display summary information about a color policy for a specific interface.
Dell# show qos dscp-color-policy summary te 0/10
Interface dscp-color-map
TE 0/10 mapONE
Display detailed information about a color policy for a specific interface
Dell# show qos dscp-color-policy detail te 0/10
Interface TenGigabitEthernet 0/10
Dscp-color-map mapONE
yellow 4,7
red 20,30
Enabling QoS Rate Adjustment
By default, while rate limiting, policing, and shaping, the system 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, and no qos-rate-adjust is listed in the running-configuration
● Include a specified 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, enter qos-rate-adjust 8. For variable length overhead fields, know the
number of bytes you want to include.
The default is disabled.
The range is from 1 to 31.
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 and bandwidth-weight percentage configurations.
● A queue with strict priority can starve other queues in the same port-pipe.
Quality of Service (QoS)
795