Developers Guide

Table 19. DCB Map to an Ethernet Port (continued)
Step Task Command Command Mode
2
Apply the DCB map on the Ethernet port to configure it
with the PFC and ETS settings in the map; for example:
DellEMC# interface tengigabitEthernet
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 configured for PFC using the pfc
priority command or which is already configured for
lossless queues (pfc no-drop queues command).
dcb-map name
INTERFACE
Configuring 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 specific dot1p-priorities on individual interfaces without using a DCB map. This type of DCB configuration is
useful on interfaces that require PFC for lossless traffic, but do not transmit converged Ethernet traffic.
Table 20. Configuring PFC without a DCB Map
Step Task Command Command Mode
1 Enter interface configuration mode on an Ethernet
port.
interface interface-
type}
CONFIGURATION
2 Enable PFC on specified 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 configure PFC using the pfc
priority command on an interface on which a
DCB map has been applied or which is already
configured for lossless queues (pfc no-drop
queues command).
pfc priority priority-
range
INTERFACE
Configuring 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 configured to be lossless (typically priorities 3 and 4). Any received pause frames
are reflected in the appropriate counters, and PFC watchdog accounts for pause frames on all priorities.
Table 21. Configuring PFC Assymetric
Step Task Command Command Mode
1 Enter interface configuration mode on an Ethernet
port.
DellEMC#interface
interface-type
CONFIGURATION
Data Center Bridging (DCB) 255