Administrator Guide

QoS dot1p Traffic Classification and
Queue Assignment
DCB supports PFC, ETS, and DCBx to handle converged Ethernet traffic that is assigned to an egress queue
according to the following QoS methods:
Honor dot1p dot1p priorities in ingress traffic are used at the port or global switch level.
Layer 2 class maps dot1p priorities are used to classify traffic in a class map and apply a service 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.
Although the system allows you to change the default dot1p priority-queue assignments, DCB policies
applied to an interface may become invalid if you reconfigure dot1p-queue mapping. If the configured
dcb-map remains valid, the change in the dot1p-queue assignment is allowed. For DCB ETS enabled
interfaces, traffic destined to queue that is not mapped to any dot1p priority are dropped.
dot1p Value in
the Incoming
Frame
Egress Queue Assignment
0 0
1 0
2 0
3 1
4 2
5 3
6 3
7 3
Data Center Bridging (DCB) 309