Reference Guide

Data Center Bridging (DCB) | 289
Applying a DCB Map on a Port
When you apply a DCB map with PFC enabled on an S5000 interface, a memory buffer for PFC-enabled
priority traffic is automatically allocated. The buffer size is allocated according to the number of
PFC-enabled priorities in the assigned map.
To apply a DCB map to an Ethernet port, follow these steps:
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 specified dot1p-priorities on individual interfaces without using a
DCB map. This type of DCB configuration is useful on interfaces which require PFC for lossless traffic
but do not transmit converged Ethernet traffic.
Step Task Command Command Mode
1 Enter interface configuration mode on an Ethernet port.
interface {tengigabitEthernet
slot
/port | fortygigabitEthernet
slot
/port}
CONFIGURATION
2 Apply the DCB map on the Ethernet port to configure it
with the PFC and ETS settings in the map; for example:
Dell# interface tengigabitEthernet 0/0
Dell (config-if-te-0/0)# dcb-map SAN_A_dcb_map1
Repeat Steps 1 and 2 to apply a DCB map to more than
one port.
Note: You cannot apply a DCB map on an interface
which 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
Step Task Command Command Mode
1 Enter interface configuration mode on an Ethernet
port.
interface {tengigabitEthernet
slot
/port | fortygigabitEthernet
slot
/port}
CONFIGURATION
2 Enable PFC on specified priorities. Range: 0-7.
Default: None.
Maximum number of loss less 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
Note: 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