Administrator Guide

• A limit of 4 lossless queues are supported on a port. If the number of lossless queues congured exceeds the maximum supported limit
per port (two), an error message is displayed. You must re-congure the value to a smaller number of queues.
• If you congure lossless queues on an interface that already has a DCB map with PFC enabled (pfc on), an error message is displayed.
Table 17. Conguring Lossless Queues
Step Task Command Command Mode
1 Enter INTERFACE Conguration
mode.
interface
{tengigabitEthernet
slot/port |
fortygigabitEthernet
slot}
port-number is a port number
from 0 to 23.
CONFIGURATION
2
Open a DCB map and enter DCB
map conguration mode.
dcb-map name
INTERFACE
3
Disable PFC.
no pfc mode on
DCB MAP
4
Return to interface conguration
mode.
exit
DCB MAP
5
Apply the DCB map, created to
disable the PFC operation, on
the interface
dcb-map {name }
INTERFACE
6
Congure the port queues that
still function as no-drop queues
for lossless trac. For the dot1p-
queue assignments.
The maximum number of lossless
queues globally supported on a
port is 2.
You cannot congure PFC no-
drop queues on an interface on
which a DCB map with PFC
enabled has been applied, or
which is already congured 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
congured.
pfc no-drop
queuesqueue-range
INTERFACE
266 Data Center Bridging (DCB)