From: Moin, Imran (imoin@virtela.net)
Date: Tue Aug 29 2006 - 00:49:45 ART
Victor,
Good explanation. If the question states that the interface needs to be
withdrawn from the routing table if there are 3 or more flaps in 30
secs, then I guess the most important thing to decide is when to
suppress the interface. With only these requirements, will these values
work?
Half-life Time = 30 secs
Value to start reusing the interface - Doesn't matter, does it?
Value to start suppressing an interface = 2000
Max duration to suppress an interface = doesn't matter, does it?
Thanks,
Imran.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Victor Cappuccio
Sent: Thursday, July 27, 2006 2:20 PM
To: 'Sami'
Cc: ccielab@groupstudy.com
Subject: RE: dampening
Sami,
Some good links
http://www.groupstudy.com/archives/ccielab/200603/msg00204.html
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft
/120
limit/120s/120s22/s_ipevdp.htm#wp1027177
The answer for your question:
dampening 30 1500 2000 100
And some outputs from a Router.
To resume the output below
1st Flap at Jul 27 00:14:58.985 penalty 1000, flap count 1 2nd Flap at
Jul 27 00:15:11.125 penalty 1755, flap count 2, Diff 1st Flap & 2nd Flap
almost 13s 3er Flap at Jul 27 00:15:23.614 penalty 2331, now suppressed
with a reuse intervals of 20 12 from a amount of 25 sec.
R2(config-if)#do show run int s0/0 | in damp
dampening 30 1500 2000 100
R2(config-if)#s
R2(config-if)#
Jul 27 00:14:58.985: IF-EvD(Serial0/0): IP Routing reports state
transition from UP to DOWN
========================================================================
====
Jul 27 00:14:58.985: EvD(Serial0/0): charge penalty 1000, new accum.
penalty 1000, flap count 1
========================================================================
====
Jul 27 00:14:58.985: EvD(Serial0/0): accum. penalty 1000, not suppressed
========================================================================
====
Jul 27 00:14:58.985: IF-EvD(Serial0/0): update IP Routing state to DOWN,
interface is not suppressed
========================================================================
====
R2(config-if)#s
R2(config-if)#
========================================================================
====
Jul 27 00:15:11.125: IF-EvD(Serial0/0): IP Routing reports state
transition from UP to DOWN
========================================================================
====
Jul 27 00:15:11.125: EvD(Serial0/0): accum. penalty decayed to 757 after
12
second(s)
========================================================================
====
Jul 27 00:15:11.125: EvD(Serial0/0): charge penalty 1000, new accum.
penalty 1757, flap count 2
========================================================================
====
Jul 27 00:15:11.125: EvD(Serial0/0): accum. penalty 1757, not suppressed
========================================================================
====
R2(config-if)#s
R2(config-if)#
========================================================================
====
Jul 27 00:15:23.614: IF-EvD(Serial0/0): IP Routing reports state
transition from UP to DOWN
========================================================================
===
Jul 27 00:15:23.614: EvD(Serial0/0): accum. penalty decayed to 1331
after 12
second(s)
========================================================================
===
Jul 27 00:15:23.614: EvD(Serial0/0): charge penalty 1000, new accum.
penalty 2331, flap count 3
========================================================================
====
Jul 27 00:15:23.614: EvD(Serial0/0): accum. penalty 2331, now suppressed
with a reuse intervals of 20, ::::: THE INTERFACE IS SUPPRESSED::::
========================================================================
====
Jul 27 00:15:23.614: IF-EvD(Serial0/0): update IP Routing state to DOWN,
interface is suppressed R2(config-if)# Jul 27 00:15:25.613:
%LINK-5-CHANGED: Interface Serial0/0, changed state to administratively
down R2(config-if)#n Jul 27 00:15:25.613: IF-EvD(Serial0/0): IP Routing
reports state transition from DOWN to DOWN Jul 27 00:15:26.614:
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0,changed state
to down Jul 27 00:15:26.614: IF-EvD(Serial0/0): IP Routing reports state
transition from DOWN to DOWN R2(config-if)#n R2(config-if)# Jul 27
00:15:26.815: IF-EvD(Serial0/0): IP Routing reports state transition
from DOWN to UP R2(config-if)# Jul 27 00:15:28.814: %LINK-3-UPDOWN:
Interface Serial0/0, changed state to up R2(config-if)# Jul 27
00:15:28.814: IF-EvD(Serial0/0): IP Routing reports state transition
from UP to UP Jul 27 00:15:28.814: IF-EvD(Serial0/0): IP Routing reports
state transition from UP to UP Jul 27 00:15:29.816: %LINEPROTO-5-UPDOWN:
Line protocol on Interface Serial0/0, changed state to up Jul 27
00:15:29.816: IF-EvD(Serial0/0): IP Routing reports state transition
from UP to UP
HTH
Victor.-
-----Mensaje original-----
De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
Sami Enviado el: Miircoles, 26 de Julio de 2006 06:03 p.m.
Para: ccielab
Asunto: dampening
Group,
One of the task say ..3 interfcae flaps in 30 second will keep interface
participating in routing...Is this correct ?
dampening 30 1000 2000 120..
Thanks
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