Concept Guide

Table 17. DCB Map to an Ethernet Port
Step Task Command Command Mode
1
Enter interface conguration mode on an Ethernet port.
interface interface-type }
CONFIGURATION
2
Apply the DCB map on the Ethernet port to congure it with
the PFC and ETS settings in the map; for example:
DellEMC# interface tengigabitEthernet 1/1/1
DellEMC(config-if-te-1/1/1)# dcb-map
SAN_A_dcb_map1 Repeat Steps 1 and 2 to apply a DCB map
to more than one port.
You cannot apply a DCB map on an interface that has been
already congured for PFC using the pfc priority
command or which is already congured for lossless queues
(pfc no-drop queues command).
dcb-map name
INTERFACE
Conguring PFC without a DCB Map
In a network topology that uses the default ETS bandwidth allocation (assigns equal bandwidth to each priority), you can also enable PFC
for specic dot1p-priorities on individual interfaces without using a DCB map. This type of DCB conguration is useful on interfaces that
require PFC for lossless trac, but do not transmit converged Ethernet trac.
Table 18.
Conguring PFC without a DCB Map
Step Task Command Command Mode
1 Enter interface conguration mode on an Ethernet port.
interface interface-type}
CONFIGURATION
2 Enable PFC on specied priorities. Range: 0-7. Default:
None.
Maximum number of lossless queues supported on an
Ethernet port: 2.
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).
pfc priority priority-
range
INTERFACE
Conguring PFC Asymmetric
The interface is designed to honor incoming pause frames (lossy and lossless) on all priorities. However, the interface will only generate
pause frames on priorities that are congured to be lossless (typically priorities 3 and 4). Any received pause frames are reected in the
appropriate counters, and PFC watchdog accounts for pause frames on all priorities.
288
Data Center Bridging (DCB)