Dell S4820T Configuration Manual page 329

Honor dot1p You can honor dot1p priorities in ingress traffic at the port or global switch level
(refer to Default dot1p to Queue Mapping) using the service-class dynamic
dot1p command in INTERFACE configuration mode.
Layer 2 class You can use dot1p priorities to classify traffic in a class map and apply a service
maps policy to an ingress port to map traffic to egress queues.
NOTE: Dell Networking does not recommend mapping all ingress traffic to a single queue when
using PFC and ETS. However, Dell Networking does recommend using Ingress traffic classification
using the service-class dynamic dot1p command (honor dot1p) on all DCB-enabled
interfaces. If you use L2 class maps to map dot1p priority traffic to egress queues, take into account
the default dot1p-queue assignments in the following table and the maximum number of two
lossless queues supported on a port (refer to
Although Dell Networking OS allows you to change the default dot1p priority-queue assignments
(refer to Setting dot1p Priorities for Incoming
become invalid if you reconfigure dot1p-queue mapping. If the configured DCB policy remains
valid, the change in the dot1p-queue assignment is allowed.
NOTE: Although, each port on the S4810, S4820T, and S5000 devices support 8 QoS queues, you
can configure only 4 QoS queues (0-3) to manage data traffic. The remaining 4 queues (4-7) are
reserved for control traffic.
dot1p Value in the Egress Queue Assignment
Incoming Frame
0 0
1 0
2 0
3 1
4 2
5 3
6 3
7 3
dot1p Value in the Egress Queue Assignment
Incoming Frame
0 2
1 0
2 1
3 3
4 4
5 5
6 6
7 7
Data Center Bridging (DCB)
Configuring Lossless Queues).
Traffic), DCB policies applied to an interface may
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