Users Guide

Create a Layer 2 input policy map by entering the policy-map-input layer2 command.
2. After you create an input policy map, do one or more of the following:
Applying a Class-Map or Input QoS Policy to a Queue
Applying an Input QoS Policy to an Input Policy Map
Honoring DSCP Values on Ingress Packets
Guaranteeing Bandwidth to dot1p-Based Service Queues
Honoring dot1p Values on Ingress Packets
3. Apply the input policy map to an interface.
Applying a Class-Map or Input QoS Policy to a Queue
To apply a class-map or input QoS policy to a queue, use the following command.
• Assign an input QoS policy to a queue.
POLICY-MAP-IN mode
service-queue
Applying an Input QoS Policy to an Input Policy Map
To apply an input QoS policy to an input policy map, use the following command.
• Apply an input QoS policy to an input policy map.
POLICY-MAP-IN mode
policy-aggregate
Honoring DSCP Values on Ingress Packets
You can configure the ability to honor DSCP values on ingress packets by using the Trust DSCP feature.
The following table lists the standard DSCP definitions and indicates how DSCP values are mapped to
queues. When you configure trust DSCP, the matched packets and matched bytes counters are not
incremented in the show qos statistics.
Table 73. Default DSCP to Queue Mapping
DSCP/CP bit range
(in hexadecimal)
DSCP Definition Traditional IP
Precedence
Internal Queue ID DSCP/CP decimal
range
111xxx Network Control 7 56–63
110xxx Internetwork
Control
6 48–55
101xxx EF (Expedited
Forwarding)
CRITIC/ECP 5 40–47
100xxx AF4 (Assured
Forwarding)
Flash Override 4 32–39
011xxx AF3 Flash 3 24–31
010xxx AF2 Immediate 2 16–23
001xxx AF1 Priority 1 8–15
Quality of Service (QoS)
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