8
When you configure PFC, follow these guidelines:
•
To perform PFC on a network port of an IRF member device, configure PFC on both the network port
and the IRF physical ports. For information about IRF, see
IRF configuration Guide
.
•
To ensure correct operations of IRF and other protocols, H3C 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 regardless of whether 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 feature and the generic flow control feature is shown in
Table 1
The relationship between the PFC feature and the generic flow control feature
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.
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. However, the port can
still handle common and PFC pause frames
from the peer.
Enabling energy saving features on an Ethernet interface
Enabling auto power-down on an Ethernet interface
IMPORTANT:
Fiber ports do not support this feature.
With the auto power-down feature, if an interface has been down for a certain period of time, the
following events occur:
•
The device automatically stops supplying power to the interface.
•
The interface enters the power save mode.
The time period depends on the chip specifications and is not configurable. When the interface goes up,
the device automatically restores power supply to the interface and the interface enters its normal state.
This feature is applicable to only S5820V2-54QS-GE switches.
To enable auto power-down on an Ethernet interface:
