Administrator Guide

Step Task Command Command Mode
port queue lossless. The sum of all allocated bandwidth
percentages in all groups in the DCB map must be 100%.
Strict-priority trac is serviced rst. Afterwards,
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.
Example: priority-group 0 bandwidth 60 pfc o priority-
group 1 bandwidth 20 pfc on priority-group 2 bandwidth
20 pfc on priority-group 4 strict-priority pfc o
Repeat this step to congure PFC and ETS trac handling
for each priority group.
3
Specify the dot1p priority-to-priority group mapping for
each priority. Priority-group range: 0 to 7. 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.
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
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 the 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, rst 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
When you apply a DCB map with PFC enabled on an S6000 interface, a memory buer for PFC-enabled priority trac is
automatically allocated. The buer size is allocated according to the number of PFC-enabled priorities in the assigned map.
To apply a DCB map to an Ethernet port, follow these steps:
Step
Task Command Command Mode
1
Enter interface conguration mode on an Ethernet port.
interface {tengigabitEthernet
slot/port |
CONFIGURATION
32
Data Center Bridging (DCB)