R211x-HP Flexfabric 11900 Layer 2 - LAN Switching Configuration Guide

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• If PFC is disabled for the 802.1p priority, the local port drops the packet.
To configure PFC on an Ethernet interface:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enable PFC on the interface
through automatic negotiation
or forcibly.
priority-flow-control { auto |
enable }
By default, PFC is disabled.
3. Enable PFC for specific
802.1p priorities.
priority-flow-control no-drop
dot1p dot1p-list
By default, PFC is disabled for all
802.1p priorities.
4. Enter Ethernet interface view.
interface interface-type
interface-number
N/A
5. Enable PFC on the interface
through automatic negotiation
or forcibly.
priority-flow-control { auto |
enable }
By default, PFC is disabled.
6. Enable PFC for specific
802.1p priorities.
priority-flow-control no-drop
dot1p dot1p-list
By default, PFC is disabled for all
802.1p priorities.
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. When the switch operates in IRF mode, you must enable PFC
on the IRF physical port. For more information about IRF, see IRF Configuration Guide.
• 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.
• A port can receive PFC pause frames whether or not PFC is enabled on the port. However, only a
port with PFC enabled can process PFC pause frames. To make PFC take effect, make sure PFC is
enabled on both the local end and the peer end.
The relationship between the PFC function and the generic flow control function is shown in Table 1.
Table 1 The relationship betwe
en the PFC function and the generic flow control function
flow-control
priority-flo
w-control
enable
priority-flow-contr
ol 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.