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For DCB to operate effectively, you can classify ingress traffic according to its dot1p priority so that it
maps to different data queues. The dot1p-queue assignments used are shown in the following table.
To enable DCB, enable either the iSCSI optimization configuration or the FCoE configuration.
NOTE: Dell Networking OS Behavior: DCB is not supported if you enable link-level flow control on
one or more interfaces. For more information, refer to Ethernet Pause Frames.
QoS dot1p Traffic Classification and Queue Assignment
The following section describes QoS dot1P traffic classification and assignments.
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 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
maps
You can use dot1p priorities 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 (refer to
Configuring Lossless Queues).
Although Dell Networking OS allows you to change the default dot1p priority-queue assignments
(refer to Setting dot1p Priorities for Incoming Traffic), DCB policies applied to an interface may
become invalid if you reconfigure dot1p-queue mapping. If the configured DCB policy remains
valid, the change in the dot1p-queue assignment is allowed.
dot1p Value in the
Incoming Frame
Egress Queue Assignment
0 2
1 0
2 1
3 3
4 4
5 5
6 6
7 7
SNMP Support for PFC and Buffer Statistics Tracking
Buffer Statistics Tracking (BST) feature provides a mechanism to aid in Resource Monitoring and Tuning
of Buffer Allocation. The support for Max Use Count mode in Buffer Statistics is introduced in Dell
246
Data Center Bridging (DCB)