11
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 Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Ethernet interface
view.
interface
interface-type
interface-number
N/A
3.
Enable generic flow control.
•
Enable TxRx-mode generic
flow control:
flow-control
•
Enable Rx-mode generic flow
control:
flow-control receive enable
By default, generic flow control is
disabled on an Ethernet interface.
Setting the statistics polling interval
The following matrix shows the supported views of firewall devices for the feature:
Hardware Supported views
F5020/F5040
Ethernet interface view
M9006/M9010/M9014
Ethernet interface view
VFW1000 System
view
To set the statistics polling interval in system view:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
