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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Enabling QoS Rate Adjustment

By default, while rate limiting, policing, and shaping, the 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, 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.

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