Wondering if anyone could help me out here. I trying
to get my head around this whole dampening thing. I know why you need it,
and how to configure it. The only thing I don't know or understand is how
to come up with the values (other then the default). Lets take ip event
dampening for an example Ok.
Router(config-if)#dampening [half-life-period reuse-threshold]
[suppress-threshold max-suppress] [restart-penalty]
Now I understand that once an interface flaps it is
assigned a penalty of 1000. Half-life period is the time after which the
penalty is decreased. The penalty is decreased by half after the half-life
period expires. The reuse-threshold is based on the number of penalise. Once
the penalty falls below this value the interface is unsuppressed. The
suppress-threshold is the value of the accumulated penalties. Once the
suppress-threshold is reached the interface(or route) is suppressed. The
max-suppress-time is basically the time in seconds the interface can be
suppressed (im a little confused with this compared to reuse-threshold). And
lastly the restart-penalty is just a value the interface should start with
once the router has been rebooted and the interface comes up.
Now with all this said, how does one work all these
values out. For example. I have an interface that flaps. I want to dampen
that interface if it flaps lets say 3 time in 5 minutes. once it is dampened
it should stay dampened for 10 mins. How would I work out these values for
this sort of problem. Is there some magic formula ? Its prob very simple but
Im just not seeing the light here. Any help would be appreciated.