7
Configuring physical state change suppression on an
Ethernet interface
IMPORTANT:
Do not enable this feature on an interface with RRPP, MSTP, or Smart Link enabled.
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 tasks:
•
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.
When you configure this feature, follow these guidelines:
•
To suppress only link-down events, configure the
link-delay
[
msec
]
delay-time
command.
•
To suppress only link-up events, configure the
link-delay
[
msec
]
delay-time mode up
command.
•
To suppress both link-down and link-up events, configure the
link-delay
[
msec
]
delay-time
mode updown
command.
•
The
link-delay
command and the
link-delay
mode
command overwrite each other, and
whichever is configured last takes effect.
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.
Set the suppression
interval for link-down
events.
link-delay
[
msec
]
delay-time
By default, link-down events are not
suppressed.
4.
Set the suppression
interval for link-up events.
link-delay
[
msec
]
delay-time
mode up
By default, link-up events are not
suppressed.
5.
Set the suppression
interval for both link-up
and link-down events.
link-delay
[
msec
]
delay-time
mode updown
By default, neither link-up nor
link-down events are suppressed.
Enabling loopback testing on an Ethernet interface
CAUTION:
After you enable this feature on an Ethernet interface, the interface does not forward data traffic.
Содержание S7500E-XS Series
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