Configuration manual

To reconfigure the Aggregator so that all interfaces come up with DCB disabled and link-level flow

control enabled, use the no dcb enable on-next-reload command. PFC buffer memory is

automatically freed.

Enabling Auto-DCB-Enable Mode on Next Reload To configure the Aggregator so that all interfaces

come up in auto-DCB-enable mode with DCB disabled and flow control enabled, use the dcb enable

aut-detect on-next-reload

command.

Task Command Command Mode

Globally enable auto-detection

of DCBx and auto-enabling of

DCB on all interfaces after switch

reload.

dcb enable auto-detect on-next-

reload

CONFIGURATION

Enabling DCB To configure the Aggregator so that all interfaces are DCB enabled and flow control

disabled, use the dcb enable command.

Disabling DCB To configure the Aggregator so that all interfaces are DCB disabled and flow control

enabled, use the no dcb enable command.

dcb enable auto-detect on-next-reload Command Example

Dell#dcb enable auto-detect on-next-reload

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 policy 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

Data Center Bridging (DCB)