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Step Task
You cannot configure PFC no-drop
queues on an interface on which a
DCB map with PFC enabled has
been applied, or which is already
configured for PFC using the pfc
priority command.
Range: 0-3. Separate queue values
with a comma; specify a priority
range with a dash; for example: pfc
no-drop queues 1,3 or pfc no-drop
queues 2-3 Default: No lossless
queues are configured.
Applying a DCB Map on a Line Card
On the C9010, DCB is supported per-line card. If the traffic handled by a DCB map is transmitted on ports on
different line cards, you must manually configure the DCB map on the backplane ports of the C9010 line
cards on which the ports reside.
•
Apply a DCB map with PFC and ETS settings on the backplane ports of C9010 line cards.
CONFIGURATION mode
dcb-map {linecard {0-11 | all} [port-set {0-3 | all}] backplane all dcb-map-name
NOTE:
On the C9010, linecard 10 and linecard 11 correspond to RPM0 and RPM1 respectively.
To enable DCB across C9010 line cards, apply a DCB map on all installed line cards (linecard 0–9)
and RPMs (linecard 10–11).
NOTE:
If the DCB map you apply to the backplane ports of C9010 RPMs (linecard 10–11) configures
two or more priority groups, you must increase the size of the PFC shared and total buffers (dcb pfc-
shared-buffer-size and dcb pfc-total-buffer-size commands).
Data Center Bridging: Default
Configuration
Before you configure PFC and ETS on a switch see the priority group setting taken into account the following
default settings:
•
DCB is enabled.
•
The PFC memory buffer supports up to 2 lossless queues per port on all PFC enabled ports.
•
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
Queue : 1
Command
1
2
3
4
5
6
0
2
3
4
5
6
7
7
Data Center Bridging (DCB)
Command Mode
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Troubleshooting
