DELL 9.7(0.0) User Manual

When configuring lossless queues on a port interface, consider the following points:

• By default, no lossless queues are configured on a port.
• A limit of two lossless queues are supported on a port. If the number of lossless queues configured 

exceeds the maximum supported limit per port (two), an error message is displayed. You must re-
configure the value to a smaller number of queues.

• If you configure lossless queues on an interface that already has a DCB map with PFC enabled (pfc 

on), an error message is displayed.

Step

Task

Command

Command Mode

1

Enter INTERFACE Configuration mode.

interface 
{tengigabitEthernet 
slot/port | 
fortygigabitEthernet 
slot/port}

CONFIGURATION

2

Open a DCB map and enter DCB map 

configuration mode.

dcb-map name

INTERFACE

3

Disable PFC.

no pfc mode on

DCB MAP

4

Return to interface configuration mode.

exit

DCB MAP

5

Apply the DCB map, created to disable the 

PFC operation, on the interface

dcb-map {name | 
default}

INTERFACE

6

Configure the port queues that still function 

as no-drop queues for lossless traffic. For 

the dot1p-queue assignments.

The maximum number of lossless queues 

globally supported on a port is 2.

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.

pfc no-drop 
queuesqueue-range

INTERFACE

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.

PFC and ETS are globally enabled by default.

250

Data Center Bridging (DCB)