Users Guide

Creating a DCB Map
Configure the priority-based flow control (PFC) and enhanced traffic selection (ETS) settings in a DCB map
before you apply them on downstream server-facing ports on an NPG.
1 Create a DCB map to specify PFC and ETS settings for groups of dot1p priorities.
CONFIGURATION mode
dcb-map name
2 Configure the PFC setting (on or off) and the ETS bandwidth percentage allocated to traffic in each
priority group or whether priority group traffic should be handled with strict-priority scheduling.
DCB MAP mode
priority-group group_num {bandwidth percentage | strict-priority} pfc {on |
off}
The sum of all allocated bandwidth percentages must be 100%.
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.
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