5
To enable 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 flow control.
•
Enable TxRx flow control:
flow-control
•
Enable Rx flow control:
flow-control receive
enable
Use either command.
By default, Rx flow control is disabled
on an Ethernet interface.
Configuring link state change suppression on an
Ethernet interface
An Ethernet interface has two physical link states: up and down. Each time the physical link of an
interface goes up or comes down, the physical layer reports the change to the upper layers, and the
upper layers handle the change, resulting in increased overhead.
To prevent physical link flapping from affecting system performance, configure link change
suppression to delay the reporting of physical link state changes. When the delay expires, the
interface reports any detected change.
Link change suppression does not suppress administrative up or down events. When you shut down
or bring up an interface by using the
shutdown
or
undo shutdown
command, the interface reports
the event to the upper layers immediately.
Link-down event suppression enables an interface to suppress link-down events and start a delay
timer each time the physical link goes down. During this delay, the interface does not report the
link-down event, and the
display interface brief
or
display interface
command displays the
interface state as UP. If the physical link is still down when the timer expires, the interface reports the
link-down event to the upper layers.
Link-up event suppression enables an interface to suppress link-up events and start a delay timer
each time the physical link goes up. During this delay, the interface does not report the link-up event,
and the
display interface brief
or
display interface
command displays the interface state as
DOWN. If the physical link is still up when the timer expires, the interface reports the link-up event to
the upper layers.
Configuring link-down event suppression
To enable an Ethernet interface to suppress link-down events:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Ethernet interface
view.
interface interface-type
interface-number
N/A
3.
Set a link-down event
suppression interval.
link-delay delay-time
Link-down event suppression is disabled by
default.
