Reference Guide

NPIV Proxy Gateway | 633
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 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.
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.
The sum of all allocated bandwidth percentages must
be 100%.
Strict-priority traffic is serviced first. Afterwards,
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.
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
priority-group group_num
{bandwidth percentage |
strict-priority} pfc {on | off}
DCB MAP
3 Specify the priority group ID number to handle VLAN
traffic 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.
Note: All priorities that map to the same egress queue
must be in the same priority group.
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
DCB MAP
Step Task Command Command Mode