4
dampening
Use
dampening
to enable the device to dampen an interface when the interface is flapping.
Use
undo dampening
to restore the default.
Syntax
dampening
[
half-life
reuse suppress max-suppress-time
]
undo dampening
Default
Interface dampening is disabled on Ethernet interfaces.
Views
Ethernet interface view
Predefined user roles
network-admin
Parameters
half-life
: Specifies the amount of time after which a penalty is decreased, in the range of 1 to
120 seconds. The default value is 54 seconds.
reuse
: Specifies the reuse threshold in the range of 200 to 20000. The default value is 750. The
reuse threshold must be less than the suppression threshold.
suppress
: Specifies the suppression threshold in the range of 200 to 20000. The default value is
2000.
max-suppress-time
: Specifies the maximum amount of time the interface can be dampened, in
the range of 1 to 255 seconds. The default value is 162 seconds (three times the half-life timer).
Usage guidelines
When configuring the
dampening
command, follow these rules to set the values mentioned above:
•
The ceiling is equal to 2 (Max-suppress-time/Decay) × reuse-limits. It is not user configurable.
•
The configured suppress limit is lower than or equal to the ceiling.
•
The ceiling is lower than or equal to the maximum suppress limit supported.
This command, the
link-delay
command, and the
port link-flap protect enable
command are mutually exclusive on an interface.
This command does not take effect on the administratively down events. When you execute the
shutdown
command, the penalty restores to 0, and the interface reports the down event to the
higher layer protocols.
Do not enable the dampening function on an interface with RRPP, MSTP, or Smart Link enabled.
After an interface in down state is dampened, the interface state displayed through the
display
interface
command is always down.
Examples
# Enable interface dampening on GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] dampening
# Enable interface dampening on GigabitEthernet 1/0/1, and set the following parameters:
•
Half life time to 2 seconds.
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