Administrator Guide

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 denitions and indicates to which queues Dell Networking OS maps DSCP values. When you
congure trust DSCP, the matched packets and matched bytes counters are not incremented in the show qos statistics.
Table 75. Default DSCP to Queue Mapping
DSCP/CP hex range
(XXX)xxx
DSCP Denition Traditional IP
Precedence
Internal Queue ID DSCP/CP decimal
111XXX Network Control 3 48–63
110XXX Internetwork Control 3 48–63
101XXX EF (Expedited
Forwarding)
CRITIC/ECP 2 32–47
100XXX AF4 (Assured
Forwarding)
Flash Override 2 32–47
011XXX AF3 Flash 1 16–31
010XXX AF2 Immediate 1 16–31
001XXX AF1 Priority 0 0–15
000XXX BE (Best Eort) Best Eort 0 0–15
• 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 species the queue to which the classied trac is sent based on the dot1p value.
Table 76. Default dot1p to Queue Mapping
dot1p Queue ID
0 1
1 0
2 2
3 3
4 4
5 5
6 6
7 7
742 Quality of Service (QoS)