Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
Event dampening suppresses a constantly unstable interface until it remains stable for a period of time. Enabling
dampening on an interface that already has dampening configured has the effect of resetting the penalty
associated with that interface to zero. The reuse threshold must always be less than the suppress threshold.
Consider the following guidelines when configuring event dampening:
•
Configuring dampening on both a subinterface and its parent is usually unnecessary because their states
are almost always the same and dampening would be triggered at the same time on each interface.
•
If all subinterfaces require dampening, then apply dampening to the main interface only. Applying
configuration to large numbers of subinterfaces requires an abundance of memory and increases the
time required to process the configuration during boot and failover.
•
When dampening is enabled, an interface has a penalty value associated with it. The value starts at 0
and is increased by 1000 whenever the underlying state of the interface changes from up to down.
•
The penalty value decreases exponentially while the interface state is stable. If the penalty value exceeds
a configured suppress threshold, then the state of the interface is suppressed and IM will not notify upper
layers of further state transitions. The suppressed state remains until the penalty value decreases past a
configured reuse threshold.
Task ID
Operations
Task ID
read, write
interface
Examples
This example shows how to enable dampening with default values on an interface:
RP/0/RSP0/CPU0:router(config)#
interface TenGigE 0/4/0/0
RP/0/RSP0/CPU0:router(config-if))#
dampening
Related Commands
Description
Command
Displays the state of all interfaces on which dampening has been
configured.
show im dampening, on page 512
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Command Reference,
Release 5.3.x
500
Global Interface Commandsonthe Cisco ASR 9000 Series Router
dampening