Administrator Guide
• If you apply a service policy that contains an ACL to more than one interface, Dell EMC Networking OS uses ACL optimization to
conserve CAM space. The ACL optimization behavior detects when an ACL exists in the CAM rather than writing it to the CAM
multiple times.
• Apply an input policy map to an interface.
INTERFACE mode
service-policy input
Specify the keyword layer2 if the policy map you are applying a Layer 2 policy map.
Creating Output Policy Maps
1. Create an output policy map.
CONFIGURATION mode
policy-map-output
2. After you create an output policy map, do one or more of the following:
Applying an Output QoS Policy to a Queue
Specifying an Aggregate QoS Policy
Applying an Output Policy Map to an Interface
3. Apply the policy map to an interface.
Applying an Output QoS Policy to a Queue
To apply an output QoS policy to a queue, use the following command.
• Apply an output QoS policy to queues.
INTERFACE mode
service-queue
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 apply it.
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)
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Quality of Service (QoS)