Dell S4048–ON Configuration Manual page 688

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 72. 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.
Table 73. Default dot1p to Queue Mapping
dot1p
0
1
2
3
4
5
6
7
Table 74. Default dot1p to Queue Mapping
dot1p
0
1
2
3
4
688
Quality of Service (QoS)
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
Queue ID
2
0
1
3
4
5
6
7
Queue ID
0
0
0
1
2
Internal Queue ID
3
3
2
2
1
1
0
0
DSCP/CP decimal
48–63
48–63
32–47
32–47
16–31
16–31
0–15
0–15