Priority-Based Flow Control Using Dynamic Buffer Method - Dell S4820T Configuration Manual

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 is supported on a port. If the number of lossless queues configured
exceeds the maximum supported limit per port (two), an error message is displayed. Reconfigure 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.
Step Task
1 Enter INTERFACE Configuration mode.
Open a DCB map and enter DCB map
2
configuration mode.
Disable PFC.
3
Return to interface configuration mode.
4
Apply the DCB map, created to disable the
5
PFC operation, on the interface
Configure the port queues that still function
6
as no-drop queues for lossless traffic. For
the dot1p-queue assignments.
The maximum number of lossless queues
globally supported on a port is 2.
You cannot configure PFC no-drop queues
on an interface on which a DCB map with
PFC enabled has been applied, or which is
already configured for PFC using the pfc
priority command.
Range: 0-3. Separate queue values with a
comma; specify a priority range with a dash;
for example: pfc no-drop queues 1,3 or pfc
no-drop queues 2-3 Default: No lossless
queues are configured.
Priority-Based Flow Control Using Dynamic Buffer
Method
Priority-based flow control using dynamic buffer spaces is supported on the S4820T platform.
In a data center network, priority-based flow control (PFC) manages large bursts of one traffic type in
multiprotocol links so that it does not affect other traffic types and no frames are lost due to congestion.
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Command
interface
{tengigabitEthernet
slot/port |
fortygigabitEthernet
slot/port}
dcb-map name
no pfc mode on
exit
dcb-map {name |
default}
pfc no-drop
queuesqueue-range
Command Mode
CONFIGURATION
INTERFACE
DCB MAP
DCB MAP
INTERFACE
INTERFACE
Data Center Bridging (DCB)