Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 747
Enabling QoS Rate Adjustment, Enabling Strict-Priority Queueing
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Display detailed information about a color policy for a specific interface DellEMC# show qos dscp-color-policy detail tengigabitethernet 1/10 Interface TenGigabitEthernet 1/10 Dscp-color-map mapONE yellow 4,7 red 20,30 Enabling QoS Rate Adjustment By default while rate limiting, policing, and shaping, Dell EMC 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. 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 rateshaping 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. INTERFACE mode service-policy output policy-map-name Enter the name for the policy map in character format (32 characters maximum). Quality of Service (QoS) 747
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