Administrator Guide

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
Repeat this step to configure PFC and ETS traffic handling for each priority group.
3 Specify the dot1p priority-to-priority group mapping for each priority. Priority-group range: 0 to 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
All priorities that map to the same queue must be in the same priority group.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.
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.
Applying a DCB Map on a Port
To apply a DCB map to an Ethernet port, follow these steps:
1 Enter interface configuration mode on an Ethernet port.
CONFIGURATION mode
interfacetengigabitEthernet slot/port
2 Apply the DCB map on the Ethernet port to configure it with the PFC and ETS settings in the map.
INTERFACE mode
FC Flex IO Modules 1059