Concept Guide

Table 63. Default DSCP to Queue Mapping
DSCP/CP
hex range
(XXX)xxx
DSCP Denition Traditional IP
Precedence
Internal
Queue ID
Internal Queue
ID
DSCP/CP decimal
(4–queue)
DSCP/CP decimal
(8–queue)
111XXX Network Control 3 7 48–63 53–63
110XXX Internetwork Control 3 6 48–63 53–63
101XXX EF (Expedited
Forwarding)
CRITIC/ECP 2 5 32–47 16–23
100XXX AF4 (Assured
Forwarding)
Flash Override 2 4 32–47 16–23
011XXX AF3 Flash 1 3 16–31 8–15
010XXX AF2 Immediate 1 2 16–31 8–15
001XXX AF1 Priority 0 1 0–15 0–7
000XXX BE (Best Eort) Best Eort 0 0 0–15 0–7
• 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 species the queue to which the classied trac is sent based on the dot1p value.
Table 64. 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
Mapping dot1p Values to Service Queues
All trac is by default mapped to the same queue, Queue 0.
If you honor dot1p on ingress, you can create service classes based the queueing strategy in Honoring dot1p Values on Ingress Packets. You
may apply this queuing strategy globally by entering the following command from CONFIGURATION mode.
722
Quality of Service (QoS)