Administrator Guide

Applying a DCB Map on a Line Card

On the C9010, DCB is supported per-line card. If the trac handled by a DCB map is transmitted on ports on dierent line cards, you must

manually congure the DCB map on the backplane ports of the C9010 line cards on which the ports reside.

• Apply a DCB map with PFC and ETS settings on the backplane ports of C9010 line cards.

CONFIGURATION mode

dcb-map {linecard {0-11 | all} [port-set {0-3 | all}] backplane all dcb-map-name

NOTE: On the C9010, linecard 10 and linecard 11 correspond to RPM0 and RPM1 respectively. To enable DCB

across C9010 line cards, apply a DCB map on all installed line cards (linecard 0–9) and RPMs (linecard 10–11).

NOTE: If the DCB map you apply to the backplane ports of C9010 RPMs (linecard 10–11) congures two or more

priority groups, you must increase the size of the PFC shared and total buers (dcb pfc-shared-buffer-size and

dcb pfc-total-buffer-size commands).

Data Center Bridging: Default Conguration

Before you congure PFC and ETS on a switch see the priority group setting taken into account the following default settings:

• DCB is enabled.

• The PFC memory buer supports up to 2 lossless queues per port on all PFC enabled ports.

• PFC and ETS are globally enabled by default.

The default dot1p priority-queue assignments are applied as follows:

Dell(conf)#do show qos dot1p-queue-mapping

Dot1p Priority : 0 1 2 3 4 5 6 7

Queue : 1 0 2 3 4 5 6 7

Dell(conf)#

Dell(conf)#dcb enable pfc-queues ?

<1-4> Number of PFC lossless queues(default=2)

NOTE

: In Egress queue assignment (8 queues).

PFC is not applied on specic dot1p priorities.

ETS: Equal bandwidth is assigned to each port queue and each dot1p priority in a priority group.

To congure PFC and ETS parameters on an interface, you must specify the PFC mode, the ETS bandwidth allocation for a priority group,

and the 802.1p priority-to-priority group mapping in a DCB map. No default PFC and ETS settings are applied to Ethernet interfaces.

Data Center Bridging (DCB)

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