Service Manual

Step Task Command Command Mode
Separate priority values with a comma. Specify a priority
range with a dash, for example: pfc priority 3,5-7
1. You cannot congure PFC using the pfc
priority command on an interface on which a
DCB map has been applied or which is already
congured for lossless queues (
pfc no-drop
queues command).
Conguring Lossless Queues
DCB also supports the manual conguration of lossless queues on an interface after you disable PFC mode in a DCB map and apply
the map on the interface. The conguration of no-drop queues provides exibility for ports on which PFC is not needed, but lossless
trac should egress from the interface.
Lossless trac egresses out the no-drop queues. Ingress 802.1p trac from PFC-enabled peers is automatically mapped to the no-
drop egress queues.
When conguring lossless queues on a port interface, consider the following points:
• By default, no lossless queues are congured on a port.
• A limit of two 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.
Step
Task Command Command Mode
1 Enter INTERFACE Conguration mode.
interface
{tengigabitEthernet slot/
port /subport |
fortygigabitEthernet slot/
port}
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 | default}
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.
pfc no-drop
queuesqueue-range
INTERFACE
Data Center Bridging (DCB)
215