Install Guide

Table Of Contents
Honoring DSCP Values on Ingress Packets
Dell EMC 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 EMC 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 82. Default DSCP to Queue Mapping
DSCP/CP
hex range
(XXX)xxx
DSCP Definition Traditional IP
Precedence
Internal
Queue ID
Internal
Queue ID
DSCP/CP
decimal (4
queue)
DSCP/CP decimal
(8queue)
111XXX Network Control 3 7 4863 5363
110XXX Internetwork
Control
3 6 4863 5363
101XXX EF (Expedited
Forwarding)
CRITIC/ECP 2 5 3247 1623
100XXX AF4 (Assured
Forwarding)
Flash Override 2 4 3247 1623
011XXX AF3 Flash 1 3 1631 815
010XXX AF2 Immediate 1 2 1631 815
001XXX AF1 Priority 0 1 015 07
000XXX BE (Best Effort) Best Effort 0 0 0–15 07
Enable the trust DSCP feature.
POLICY-MAP-IN mode
trust diffserv
Honoring dot1p Values on Ingress Packets
Dell EMC 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.
Table 83. Default dot1p to Queue Mapping
dot1p Queue ID
0 1
1 0
2 2
3 3
4 4
5 5
6 6
7 7
The dot1p value is also honored for frames on the default VLAN. For more information, refer to Priority-Tagged Frames on the
Default VLAN.
Enable the trust dot1p feature.
POLICY-MAP-IN mode
trust dot1p
692
Quality of Service (QoS)