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Table 41-4 shows an example of choosing bandwidth weights for all four queues to achieve a target
bandwidth allocation.
Specify WRED drop precedence
Specify WRED drop precedence is supported only on platform e
Specify a WRED profile to yellow and/or green traffic using the command wred from QOS-POLICY-OUT
mode. See Apply a WRED profile to traffic on page 871.
Create Policy Maps
There are two types of policy maps: input and output.
Create Input Policy Maps
There are two types of input policy-maps: Layer 3 and Layer 2.
1. Create a Layer 3 input policy map using the command
policy-map-input from CONFIGURATION
mode. Create a Layer 2 input policy map by specifying the keyword
layer2 with the policy-map-input
command.
2. Once you create an input policy map, do one or more of the following:
• Apply a class-map or input QoS policy to a queue
• Apply an input QoS policy to an input policy map
• Honor DSCP values on ingress packets
• Honoring dot1p values on ingress packets
3. Apply the input policy map to an interface. See page 868.
Apply a class-map or input QoS policy to a queue
Assign an input QoS policy to a queue using the command service-queue from POLICY-MAP-IN mode.
Table 41-4. Assigning Bandwidth Weights for the C-Series and S-Series
Queue Weight
Equivalent
Percentage
Target
Allocation
0 1 0.44% 1%
1 64 28.44% 25%
2 128 56.89% 60%
3 32 14.22% 14%
FTOS Behavior: On ExaScale, FTOS cannot classify protocol traffic on a Layer 2 interface using
Layer 3 policy map. The packets always take the default queue, Queue 0, and cannot be rate-policed.