10
Figure 1 Change rule of the penalty value
Configuration restrictions and guidelines
When you configure dampening on an Ethernet interface, follow these restrictions and guidelines:
•
The
dampening
,
link-delay
, and
port link-flap protect enable
commands are mutually
exclusive on an interface.
•
The
dampening
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 upper-layer protocols.
•
Do not enable the dampening feature on an interface with RRPP, MSTP, or Smart Link enabled.
Configuration procedure
To configure dampening 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 dampening on
the interface.
dampening
[
half-life reuse
suppress max-suppress-time
]
By default, interface dampening is
disabled on Ethernet interfaces.
Enabling link flapping protection on an interface
Link flapping on an interface changes network topology and increases the system overhead. For
example, in an active/standby link scenario, when interface status on the active link changes
between
UP
and
DOWN
, traffic switches between active and standby links. To solve this problem,
configure this feature on the interface.
Not suppressed
Not suppressed
Suppressed
Penalty
Time
Reuse limit
Suppress limit
Ceiling
t
0
t
1
t
2
