flowcontrol

This command configures a flow control mechanism to prevent buffer congestion and packet drop switch. In full duplex operation, the sender is notified to start or stop the transmission via a PAUSE frame, based on IEEE 802.3x standard. The Gigabit Ethernet switch can transmit, receive and react accordingly to 802.3x flow control frames. Flow control can be enabled or disabled per port.

Syntax

flowcontrol {auto|off|rx|rxtx|tx}

Command	Description
flowcontrol auto	Flow control auto mode.
flowcontrol off	Disables the interface to receive and send pause frames.
flowcontrol rx	Enables the interface to receive and process pause frames.
flowcontrol rxtx	Enables the interface to send and receive pause frames.
flowcontrol tx	Enables the interface to send pause frames to remote devices.

Note

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Supported interfaces: Gigabitethernet (0/0, 1/1, 1/2, 1/3, 1/4) and fiber 0/0

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Default values: All interfaces, except Fiber 0/1 by default are configured with flowcontrol auto; Fiber 0/1 is configured with flowcontrol rxtx.

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The flow control status for physical interfaces is displayed in the show run command:

Flow Control: RXTX (Remote: RX)

Where:

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Flow Control indicates the ability to send (Tx) or receive (Rx) PAUSE frames from a local (device) perspective.

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Remote indicates the partner port's ability to send or receive PAUSE frame.

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This command is applicable only to Mediant 500Li and Mediant 800Ci.

Command Mode

Privileged User

Example

This example configures enables the interface to receive and process pause frames:

# configure data
(config-data)# interface gigabitethernet 0/0
(conf-if-GE 0/0)# flowcontrol rx