Reference Guide

Strict-priority traffic is serviced first. Afterward, bandwidth allocated to other priority groups is made
available and allocated according to the specified percentages. If a priority group does not use its
allocated bandwidth, the unused bandwidth is made available to other priority groups.
NOTE: Restriction: You can enable PFC on a maximum of two priority queues.
Repeat this step to configure PFC and ETS traffic handling for each priority group; for example:
priority-group 0 bandwidth 60 pfc off
priority-group 1 bandwidth 20 pfc on
priority-group 2 bandwidth 20 pfc on
priority-group 4 strict-priority pfc off
3. Specify the priority group ID number to handle VLAN traffic for each dot1p class-of-service: from 0
through 7.
DCB MAP mode
priority-pgid dot1p0_group_num dot1p1_group_num dot1p2_group_num
dot1p3_group_num dot1p4_group_num dot1p5_group_num dot1p6_group_num
dot1p7_group_num
Leave a space between each priority group number.
For example: priority-pgid 0 0 0 1 2 4 4 4.
Where dot1p priorities 0, 1, and 2 are mapped to priority group 0; dot1p priority 3 is mapped to
priority group 1; dot1p priority 4 is mapped to priority group 2; dot1p priorities 5, 6, and 7 are mapped
to priority group 4.
NOTE: All priorities that map to the same egress queue must be in the same priority group.
Important Points to Remember
• If you remove a dot1p priority-to-priority group mapping from a DCB map (the 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 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 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.
If you delete the dot1p priority-priority group mapping (the 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.
Applying a DCB Map on Server-Facing Ethernet Ports
You can apply a DCB map only on a physical Ethernet interface and can apply only one DCB map per
interface.
1. Enter the interface Configuration mode on a server-facing port or port channel to apply a DCB map.
CONFIGURATION mode
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