Reference Guide

Task Command Command Mode
Create a DCB map to specify the PFC and
ETS settings for groups of dot1p priorities.
dcb-map name
CONFIGURATION
Congure the PFC setting (on or o) and
the ETS bandwidth percentage allocated
to trac in each priority group or whether
priority group trac should be handled
with strict priority scheduling.
priority-group group_num
{bandwidth percentage |
strict-priority} pfc {on |
off}
DCB MAP
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.
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 (the 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.
• 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.
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.
Task
Command Command Mode
Enter Interface Conguration mode on a
server-facing port to apply a DCB map.
interface {tengigabitEthernet
slot/port |
fortygigabitEthernet slot/
port}
CONFIGURATION
Apply the DCB map on an Ethernet port.
Repeat this step to apply a DCB map to
more than one port.
dcb-map name
INTERFACE
Data Center Bridging: Default Conguration
Before you congure PFC and ETS on a switch see the priority group setting taken into account the following default settings:
DCB is enabled.
PFC and ETS are globally enabled by default.
The default dot1p priority-queue assignments are applied as follows:
Dell(conf)#do show qos dot1p-queue-mapping
Dot1p Priority : 0 1 2 3 4 5 6 7
Queue : 0 0 0 1 2 3 3 3
Dell(conf)#
PFC is not applied on specic dot1p priorities.
Data Center Bridging (DCB)
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