Configuring Generic Flow Control On An Ethernet Interface - H3C S10500 Series Interface Configuration Manual

Configuration procedure
To enable loopback testing on an Ethernet interface:
Step
1. Enter system view.
2. Enter Ethernet interface
view.
3. Enable loopback testing.

Configuring generic flow control on an Ethernet interface

IMPORTANT:
• This feature is not supported on interfaces that operate in half duplex mode.
• Enabling or disabling this feature on an interface will cause the interface to go down and then
come up.
To avoid dropping packets on a link, you can enable generic flow control at both ends of the link.
When traffic congestion occurs at the receiving end, the receiving end sends a flow control (Pause)
frame to ask the sending end to suspend sending packets. Generic flow control includes the
following types:
•
TxRx-mode generic flow control—Enabled by using the flow-control command. With
TxRx-mode generic flow control enabled, an interface can both send and receive flow control
frames:
When congestion occurs, the interface sends a flow control frame to its peer.
When the interface receives a flow control frame from its peer, it suspends sending packets
to its peer.
•
Rx-mode generic flow control—Enabled by using the flow-control receive enable
command. With Rx-mode generic flow control enabled, an interface can receive flow control
frames, but it cannot send flow control frames:
When congestion occurs, the interface cannot send flow control frames to its peer.
When the interface receives a flow control frame from its peer, it suspends sending packets
to its peer.
To handle unidirectional traffic congestion on a link, configure the flow-control receive enable
command at one end and the flow-control command at the other end. To enable both ends of a link
to handle traffic congestion, configure the flow-control command at both ends.
To enable generic flow control on an Ethernet interface:
Step
1. Enter system view.
2. Enter Ethernet interface
view.
3. Enable generic flow
control.
Command
system-view
interface interface-type
interface-number
loopback { external | internal }
Command
system-view
interface interface-type
interface-number
•
Enable TxRx-mode
generic flow control:
flow-control
11
Remarks
N/A
N/A
By default, loopback testing is
disabled on an Ethernet interface.
The external keyword is not
supported in the current software
version.
Remarks
N/A
N/A
By default, generic flow control is
disabled on an Ethernet interface.