Important Points To Remember; Applying A Dcb Map On A Port - Dell C9000 Series Networking Configuration Manual

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Leave a space between each priority group number. For example: priority-pgid 0 0 0 1 2 4 4 4 in which

priority group 0 maps to dot1p priorities 0, 1, and 2; priority group 1 maps to dot1p priority 3; priority

group 2 maps to dot1p priority 4; priority group 4 maps to dot1p priorities 5, 6, and 7.

Important Points to Remember

If you remove a dot1p priority-to-priority group mapping from a DCB map (no priority pgid

command), the PFC and ETS parameters revert to their default values on the interfaces on which the

DCB map is applied. By default, PFC is not applied on specific 802.1p priorities; ETS assigns equal

bandwidth to each 802.1p priority.

As a result, PFC and lossless port queues are disabled on 802.1p priorities, and all priorities are mapped

to the same priority queue and equally share the port bandwidth.

To change the ETS bandwidth allocation configured for a priority group in a DCB map, do not modify

the existing DCB map configuration. Instead, first create a new DCB map with the desired PFC and ETS

settings, and apply the new map to the interfaces to override the previous DCB map settings. Then,

delete the original dot1p priority-priority group mapping. The maximum number of priority groups is 3.

If you delete the dot1p priority-priority group mapping (no priority pgid command) before you

apply the new DCB map, the default PFC and ETS parameters are applied on the interfaces. This change

may create a DCB mismatch with peer DCB devices and interrupt network operation.

On the C9010, DCB is supported per-line card. If the traffic handled by a DCB map is transmitted on

ports on different line cards, you must manually configure the DCB map on the backplane ports of the

C9010 line cards on which the ports reside (dcb-map linecard all backplane all command).

If the DCB map you apply to the backplane ports of C9010 RPMs (linecard 10–11) configures two or

more priority groups, you must increase the size of the PFC shared and total buffers (dcb pfc-

shared-buffer-size and dcb pfc-total-buffer-size commands).

When you apply a DCB map with PFC enabled on a switch interface, a memory buffer for PFC-enabled

priority traffic is automatically allocated. The buffer size is allocated according to the number of PFC-enabled

priorities in the assigned map.

To apply a DCB map to an Ethernet port, follow these steps:

Table 15. Applying a DCB map to an Ethernet port

Enter interface configuration mode on

an Ethernet port.

{tengigabitEthernet

Command Mode

CONFIGURATION

Data Center Bridging (DCB)