Dell S3048-ON Configuration Manual page 647

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-service-queue <number> qos-polcy
Honoring DSCP Values on Ingress Packets
Dell Networking OS provides the ability to honor DSCP values on ingress packets using Trust DSCP feature.
The following table lists the standard DSCP definitions and indicates to which queues Dell Networking OS maps DSCP values. When you
configure trust DSCP, the matched packets and matched bytes counters are not incremented in the show qos statistics.
Table 57. Default DSCP to Queue Mapping
DSCP/CP hex range
(XXX)xxx
111XXX
110XXX
101XXX
100XXX
011XXX
010XXX
001XXX
000XXX
• Enable the trust DSCP feature.
POLICY-MAP-IN mode
trust diffserv
Honoring dot1p Values on Ingress Packets
Dell Networking OS honors dot1p values on ingress packets with the Trust dot1p feature.
The following table specifies the queue to which the classified traffic is sent based on the dot1p value.
DSCP Definition
EF (Expedited
Forwarding)
AF4 (Assured
Forwarding)
AF3
AF2
AF1
BE (Best Effort)
Traditional IP
Precedence
Network Control
Internetwork Control
CRITIC/ECP
Flash Override
Flash
Immediate
Priority
Best Effort
Internal Queue ID
3
3
2
2
1
1
0
0
Quality of Service (QoS)
DSCP/CP decimal
48–63
48–63
32–47
32–47
16–31
16–31
0–15
0–15
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