R211x-HP Flexfabric 11900 Layer 2 - LAN Switching Command Reference

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Table 9 The relationship between the PFC function and the generic flow control function
flow-control
priority-flow-
control
enable
priority-flow-cont
rol no-drop dot1p
Remarks
Unconfigurable Configured Configured
You cannot enable flow control by using the
flow-control command on a port where PFC is
enabled and PFC is enabled for the specified
802.1p priority values.
Configured Configurable Unconfigurable
• On a port configured with the flow-control
command, you can enable PFC, but you
cannot enable PFC for specific 802.1p
priorities.
• Enabling both generic flow control and PFC on
a port disables the port from sending common
or PFC pause frames to inform the peer of
congestion conditions. However, the port can
still handle common and PFC pause frames
from the peer.
When you configure PFC, follow these guidelines:
• To make PFC take effect, you must configure PFC in both system view and Ethernet interface view,
and make sure the 802.1p priority list specified in Ethernet interface view is within the 802.1p
priority list specified in system view.
• To ensure correct operations of IRF and other protocols, HP recommends not enabling PFC for
802.1p priorities 0, 6, and 7.
• Perform the same PFC configuration on all ports that traffic travels through.
For more information about the 802.1p priority, priority trust mode, and port priority, see ACL and QoS
Configuration Guide.
Examples
# Configure Ten-GigabitEthernet 1/0/1 to automatically negotiate with the peer port to enable PFC,
and enable PFC for 802.1p priority 5.
<Sysname> system-view
[Sysname] interface ten-gigabitethernet 1/0/1
[Sysname-Ten-GigabitEthernet1/0/1] priority-flow-control auto
[Sysname-Ten-GigabitEthernet1/0/1] priority-flow-control no-drop dot1p 5
Related commands
• priority-flow-control
• flow-control
• flow-control receive enable
reset counters interface
Use reset counters interface to clear the Ethernet interface statistics.
Syntax
reset counters interface [ interface-type [ interface-number ] ]