Dell PowerSwitch S4820T 9.50.1 Configuration Guide for the S4820T System - Page 752
Enabling QoS Rate Adjustment, Enabling Strict-Priority Queueing, Ethernet Type/Length: 2 bytes
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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, 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. The range is from 1 to 31. Enabling Strict-Priority Queueing Strict-priority means that Dell Networking OS de-queues all packets from the assigned queue before servicing any other queues. • The strict-priority supersedes bandwidth-percentage configuration. 752 Quality of Service (QoS)
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