Qos Rate Adjustment - Dell Force10 Z9000 Configuration Manual

2. Once you create an output policy map, do one or more of the following:
• Apply an output QoS policy to a queue
• Specify an aggregate QoS policy
• Apply an output policy map to an interface
3. Apply the policy map to an interface. See
Apply an output QoS policy to a queue
Apply an output QoS policy to queues using the command
Specify an aggregate QoS policy
Specify an aggregate QoS policy using the command
Apply an output policy map to an interface
Apply an input policy map to an interface using the command
mode. You can apply the same policy map to multiple interfaces, and you can modify a policy map after
you apply it.

QoS Rate Adjustment

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)
By default, while rate limiting, policing, and shaping, FTOS 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. You can optionally include overhead
fields in rate metering calculations by enabling QoS Rate Adjustment.
page 61.
service-queue
policy-aggregate
service-policy output
from INTERFACE mode.
from POLICY-MAP-OUT mode.
from INTERFACE
Quality of Service (QoS) | 739