Deployment Guide

INTERFACE mode
pfc priority priority-range
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.
1 Enter INTERFACE Conguration mode.
CONFIGURATION mode
interfacetengigabitEthernet slot/port
2 Open a DCB map and enter DCB map conguration mode.
INTERFACE mode
dcb-map name
3 Disable PFC.
DCB MAP mode
no pfc mode on
4 Return to interface conguration mode.
DCB MAP mode
exit
5 Apply the DCB map, created to disable the PFC operation, on the interface.
INTERFACE mode
dcb-map {name | default}
6 Congure the port queues that still function as no-drop queues for lossless trac.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.The maximum number of lossless queues globally supported on a port is 2.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.
INTERFACE mode
FC Flex IO Modules
951