Deployment Guide

dcb-map name
2 Congure the PFC setting (on or o) and the ETS bandwidth percentage allocated to trac in each priority group. Congure whether
the priority group trac should be handled with strict-priority scheduling. The sum of all allocated bandwidth percentages must be
100 percent. Strict-priority trac is serviced rst. Afterward, bandwidth allocated to other priority groups is made available and
allocated according to the specied percentages. If a priority group does not use its allocated bandwidth, the unused bandwidth is
made available to other priority groups.
Restriction: You can enable PFC on a maximum of two priority queues.
Repeat this step to congure PFC and ETS trac handling for each priority group, for example: priority-group 0 bandwidth
60 pfc off priority-group 1 bandwidth 20 pfc onpriority-group 2 bandwidth 20 pfc on priority-
group 4 strict-priority pfc off
DCB MAP mode
priority-group group_num {bandwidth percentage | strict-priority} pfc {on | o}
3 Specify the priority group ID number to handle VLAN trac for each dot1p class-of-service: 0 through 7. 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.
All priorities that map to the same egress queue must be in the same priority group.
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
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 specic
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 congured for a priority group in a DCB map, do not modify the existing DCB map
conguration. Instead, 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-to-priority group mapping.
• If you delete the dot1p priority-to-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 the 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 CONFIGURATION mode on a server-facing port or port channel to apply a DCB map.
You cannot apply a DCB map on a port channel. However, you can apply a DCB map on the ports that are members of the port
channel.
CONFIGURATION mode
interface {tengigabitEthernet slot/port }
2 Apply the DCB map on an Ethernet port or port channel. The port is congured with the PFC and ETS settings in the DCB map.
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