map. This type of DCB configuration is useful on interfaces that require PFC for lossless traffic, but do not
transmit converged Ethernet traffic.
Table 18. Configuring PFC without a DCB Map
Step Task Command Command Mode
1 Enter interface configuration mode on an
Ethernet port.
interface
{tengigabitEthernet slot/
port [/subport] |
fortygigabitEthernet slot/
port}
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 Lossless Queues
DCB also supports the manual configuration of lossless queues on an interface when PFC mode is disabled in
a DCB map, 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.
Configuring no-drop queues is applicable only on the interfaces which do not need PFC.
Example:
Port A —> Port B
Port C —> Port B
PFC no-drop queues are configured for queues 1, 2 on Port B. PFC capability is enabled on priorities 3, 4 on
PORT A and C.
Port B acting as Egress
Data Center Bridging (DCB) 306
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