8
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Ethernet interface
view.
interface interface-type
interface-number
N/A
3.
Configure jumbo frame
support.
jumboframe enable
[
size
]
By default, an Ethernet interface
allows jumbo frames within 9126
bytes to pass through.
If you set the
size
argument multiple
times, the most recent configuration
takes effect.
Configuring physical state change suppression on an
Ethernet interface
The physical link state of an Ethernet interface is either up or down. Each time the physical link of an
interface comes up or goes down, the interface immediately reports the change to the CPU. The
CPU then performs the following operations:
•
Notifies the upper-layer protocol modules (such as routing and forwarding modules) of the
change for guiding packet forwarding.
•
Automatically generates traps and logs to inform users to take the correct actions.
To prevent frequent physical link flapping from affecting system performance, configure physical
state change suppression. You can configure this feature to suppress only link-down events, only
link-up events, or both. If an event of the specified type still exists when the suppression interval
expires, the system reports the event to the CPU.
Configuration restrictions and guidelines
Do not enable this feature on an interface with RRPP, spanning tree protocols, or Smart Link
enabled.
This command, the
dampening
command, and the
port link-flap protect enable
command are
mutually exclusive on an interface.
You can configure different suppression intervals for link-up and link-down events.
If you execute the
link-delay
command multiple times on an interface, the following rules apply:
•
You can configure the suppression intervals for link-up and link-down events separately.
•
If you configure the suppression interval multiple times for link-up or link-down events, the most
recent configuration takes effect.
Configuration procedure
To configure physical state change suppression 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.
Configure physical
state change
suppression.
link-delay
{
down
|
up
}
[
msec
]
delay-time
By default, an Ethernet interface immediately
reports the physical state change to the CPU.
