H3C Technologies H3C S3600 Series Switches User Manual
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Rx mode, where the port only can receive pause frames.
, when both Port A and Port B forward packets at 1000 Mbps, Port C is congested. To avoid
packet loss, you can enable flow control on Port A, and Port B.
Figure 1-1 Configure flow control on a port
Configure flow control in TxRx mode on Port B, and flow control in Rx mode on Port A:
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When congestions occur on Port C, Switch B buffers the frames. When the amount of the buffered
frames exceeds a certain value, Switch B can realize that the traffic from Port B to Port C is too
heavy and exceeds the forwarding capacity of Port C. As a result, Port B in TxRx mode sends
pause frames to Port A to inform Port A to suspend packet sending.
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Upon receiving the pause frames from Port B, Port A suspends sending packets to Port B.
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When part of the buffered frames of Switch B are sent out Port C and the amount of the buffered
frames drops to a certain level, Port B sends traffic recovery frames to Port A to inform Port A to
resume frame sending. Thus, packet loss on Port C is avoided.
Follow these steps to configure flow control on a port:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Configure flow control to
operate in TxRx mode
flow-control
Configure flow control to
operate in Rx mode
flow-control
no-pauseframe-sending
Required
Use either command
By default, flow control is disabled on a
port.
Reflector ports and fabric ports do not support the flow-control no-pauseframe-sending command.
Duplicating the Configuration of a Port to Other Ports
To make other ports have the same configuration as that of a specific port, you can duplicate the
configuration of a port to specific ports.
Specifically, the following types of port configuration can be duplicated from one port to other ports:
VLAN configuration, protocol-based VLAN configuration, LACP configuration, QoS configuration,
GARP configuration, STP configuration and initial port configuration. Refer to the command manual for
the configurations that can be duplicated.
Follow these steps to duplicate the configuration of a port to specific ports: