8
• The Enabled and Disabled fields in other cells are possible negotiation results.
Make sure all interfaces that a data flow passes through have the same PFC configuration.
Table 1 PFC configurations and negotiation results
Local (right)
Peer (below)
enable auto Default
enable
Enabled Enabled. Disabled
auto
Enabled
• Enabled if negotiation
succeeds.
• Disabled if negotiation fails.
Disabled
Default
Disabled Disabled. Disabled
Configuration restrictions and guidelines
When you configure PFC, follow these restrictions and guidelines:
• For IRF and other protocols to operate correctly, as a best practice, do not enable PFC for
802.1p priorities 0, 6, and 7.
• To avoid packet loss, apply the same PFC configuration to all interfaces that the packets pass
through.
• If you do not enable PFC on an interface, the interface can receive but cannot process PFC
pause frames. To make PFC take effect, you must enable PFC on both ends.
• If you configure the flow control or flow-control receive enable command on a PFC-enabled
interface, the following rules apply:
{ The PFC configuration takes effect.
{ The configuration of the flow control or flow-control receive enable command is ignored.
{ The flow control or flow-control receive enable command takes effect on the interface
only when PFC is disabled on it.
Configuration procedure
To configure PFC on an Ethernet interface:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Ethernet interface
view.
interface
interface-type
interface-number
N/A
3. Enable PFC in auto mode or
forcibly on the Ethernet
interface.
priority-flow-control
{
auto
|
enable
}
By default, PFC is disabled.
4. Enable PFC for 802.1p
priorities.
priority-flow-control no-drop
dot1p
dot1p-list
By default, PFC is disabled for all
802.1p priorities.
Enabling energy saving features on an Ethernet interface
IMPORTANT:
Fiber ports do not support these features.
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