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To apply a DCB map to an Ethernet port, follow these steps:
1. Enter interface configuration mode on an Ethernet port.
CONFIGURATION mode
interface {tengigabitEthernet slot/port | fortygigabitEthernet slot/port
2. Apply the DCB map on the Ethernet port to configure it with the PFC and ETS settings in the map; for example:
INTERFACE mode
dcb-map name
You cannot apply a DCB map on an interface that has been already configured for PFC using thepfc priority command
or which is already configured for lossless queues (pfc no-drop queues command).
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.
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.
1. Enter interface configuration mode on an Ethernet port.
CONFIGURATION mode
interface {tengigabitEthernet slot/
port
| fortygigabitEthernet slot/
port
}
2. Enable PFC on specified priorities. Range: 0-7. Default: None.
INTERFACE mode
pfc priority priority-range
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
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).
Configuring Lossless Queues
DCB also supports the manual configuration of lossless queues on an interface after you disable PFC mode in a DCB map and
apply the map on the interface. The configuration of no-drop queues provides flexibility for ports on which PFC is not needed,
but lossless traffic should egress from the interface.
Lossless traffic egresses out the no-drop queues. Ingress 802.1p traffic from PFC-enabled peers is automatically mapped to the
no-drop egress queues.
When configuring lossless queues on a port interface, consider the following points:
● By default, no lossless queues are configured on a port.
● A limit of two lossless queues are supported on a port. If the number of lossless queues configured exceeds the maximum
supported limit per port (two), an error message is displayed. You must re-configure the value to a smaller number of
queues.
● If you configure lossless queues on an interface that already has a DCB map with PFC enabled (pfc on), an error message is
displayed.
1. Enter INTERFACE Configuration mode.
CONFIGURATION mode
interface {tengigabitEthernet slot/port |fortygigabitEthernet slot/port}
Data Center Bridging (DCB)
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