Administrator Guide

switchport

auto vlan

protocol lldp

advertise management-tlv management-address system-name

dcbx port-role auto-downstream

no shutdown

Dell#

When no DCBx TLVs are received on a DCB-enabled interface for 180 seconds, DCB is automatically disabled and ow control is re-

enabled.

Lossless Trac Handling In auto-DCB-enable mode, Aggregator ports operate with the auto-detection of DCBx trac. At any

moment, some ports may operate with link-level ow control while others operate with DCB-based PFC enabled.

As a result, lossless trac is ensured only if trac ingresses on a PFC-enabled port and egresses on another PFC-enabled port.

Lossless trac is not guaranteed when it is transmitted on a PFC-enabled port and received on a link-level ow control-enabled port,

or transmitted on a link-level ow control-enabled port and received on a PFC-enabled port.

Enabling DCB on Next Reload To congure the Aggregator so that all interfaces come up with DCB enabled and ow control

disabled, use the dcb enable on-next-reload command. Internal PFC buers are automatically congured.

Task Command Command Mode

Globally enable DCB on all interfaces after

next switch reload.

dcb enable on-next-reload CONFIGURATION

To recongure the Aggregator so that all interfaces come up with DCB disabled and link-level ow control enabled, use the no dcb

enable on-next-reload

command. PFC buer memory is automatically freed.

Enabling Auto-DCB-Enable Mode on Next Reload To congure the Aggregator so that all interfaces come up in auto-DCB-enable

mode with DCB disabled and ow 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 congure the Aggregator so that all interfaces are DCB enabled and ow control disabled, use the dcb enable

command.

Disabling DCB To congure the Aggregator so that all interfaces are DCB disabled and ow 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 Trac Classication and Queue Assignment

DCB supports PFC, ETS, and DCBx to handle converged Ethernet trac that is assigned to an egress queue according to the

following QoS methods:

Honor dot1p

dot1p priorities in ingress trac are used at the port or global switch level.

Layer 2 class maps dot1p priorities are used to classify trac in a class map and apply a service policy to an ingress port to map

trac to egress queues.

Data Center Bridging (DCB)