From: Balogh, Jim (jim.balogh@gwl.com)
Date: Wed Oct 26 2005 - 16:07:39 GMT-3
I am working on a practice lab, and it asks that I remove an interface
from the routing table if it flaps 4 times in 30 seconds. I plan to use
the DAMPENING interface command. When looking at the DocCD, it doesn't
mention what the value of the penalty is? I am assuming 1000.
So, here is what I am wresting with......I don't know at what frequency
the flaps will occur (or do I care?)? For example, lets say with all
default settings, my flaps occur every 2 seconds. I have roughly
estimated what the decay would be:
Flap 1: time 0 seconds, penalty is 1000 + current penalty of
approximately 0 = 1000
Flap 2: time 2 seconds, penalty is 1000 + current penalty of
approximately 875 = 1875
Flap 3: time 4 seconds, penalty is 1000 + current penalty of
approximately 1640 = 2640 <--now exceeds the suppress-threshold of 2000
Flap 4: time 6 seconds, penalty is 1000 + current penalty of
approximately 2310 = 3310 <--still suppressed
Now, if the flaps occur every 5 seconds:
Flap 1: time 0 seconds, penalty is 1000 + current penalty of
approximately 0 = 1000
Flap 2: time 5 seconds, penalty is 1000 + current penalty of
approximately 800 = 1800
Flap 3: time 10 seconds, penalty is 1000 + current penalty of
approximately 1440 = 2440 <--now exceeds the suppress-threshold of 2000
Flap 4: time 15 seconds, penalty is 1000 + current penalty of
approximately 1950 = 2950 <--still suppressed
So, if my math is correct, I do not care at what rate the flaps occur,
all I care is that all 4 flaps happen within 30 seconds....correct? If I
am on target so far, then to solve the problem all I need to do is
increase the suppress-threshold to approximately 2900.
Would this solve the problem:
Interface serial 0
dampening 15 1000 2900 60
TIA
Jim
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