Enabling Qos Rate Adjustment - Dell Z9000 Configuration Manual

10/25/40/50/100gbe throughput

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Specifying an Aggregate QoS Policy

To specify an aggregate QoS policy, use the following command.

Specify an aggregate QoS policy.

POLICY-MAP-OUT mode

policy-aggregate

Applying an Output Policy Map to an Interface

To apply an output policy map to an interface, use the following command.

Apply an input policy map to an interface.

INTERFACE mode

service-policy output

You can apply the same policy map to multiple interfaces, and you can modify a policy map after you

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.

Quality of Service (QoS)