From: Hobbs (deadheadblues@gmail.com)
Date: Mon Aug 04 2008 - 19:10:36 ART
I should also add that the penalty decrease happens over time so that the
end result is cut in half after the half-life time. So if your penalty is
1000 and half-life is 15 minutes your penalty will decrease as follows
(these are estimates)
penalty: 1000
5 seconds later: 994 (estimate)
1 minute later: 920 9estimate)
5 minutes later: 800 (estimate)
15 minutes later: 500
hope you get the idea,
Please correct if I am wrong in any of this. Thank you,
On Mon, Aug 4, 2008 at 3:58 PM, Hobbs <deadheadblues@gmail.com> wrote:
> The DocCD says penalty is 1000 not 500...
>
>
> http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_bgp_int_features_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1054203
>
> The penalty is decreased by half every half-life. So if half-life is 5
> minutes and your penalty is 1000, then it will be decreased by 500 over the
> course of the next 5 minutes. And over the course of the next five minutes
> it will be decreased by 250 and so forth. The decrease value is NOT always
> the same, but the increase (1000) is.
>
> hth,
>
>
>
> On Mon, Aug 4, 2008 at 3:50 PM, Alberto Santos <albertofsantos@gmail.com>wrote:
>
>> Does anybody know how the decrease penalty works?
>>
>> 2008/8/4 Alberto Santos <albertofsantos@gmail.com>
>>
>> if you a route goes down, penalty of 500, but if it is goes down/up,
>>> penalty of 1000, it can not be changed.
>>>
>>> 2008/8/4 Hobbs <deadheadblues@gmail.com>
>>>
>>>> The question was how to alter the 1000 penalty. That can't be set with a
>>>>
>>>> route-map. And a route-map is optional:
>>>>
>>>> R1(config)#router bgp 100
>>>> R1(config-router)#bgp dampening ?
>>>> <1-45> Half-life time for the penalty
>>>> route-map Route-map to specify criteria for dampening
>>>> <cr>
>>>>
>>>> OR:
>>>>
>>>> R1(config)#route-map bgp-damp
>>>>
>>>> R1(config-route-map)#set dampening ?
>>>> <1-45> half-life time for the penalty
>>>>
>>>> R1(config-route-map)#set dampening 2 ?
>>>> <1-20000> penalty to start reusing a route
>>>>
>>>> R1(config-route-map)#set dampening 2 2 ?
>>>> <1-20000> penalty to start suppressing a route
>>>>
>>>> R1(config-route-map)#set dampening 2 2 2 ?
>>>> <1-255> Maximum duration to suppress a stable route
>>>>
>>>> R1(config-route-map)#set dampening 2 2 2 2 ?
>>>>
>>>> You still can't change penalty value of 1000
>>>>
>>>>
>>>> On Mon, Aug 4, 2008 at 3:22 PM, John <jgarrison1@austin.rr.com> wrote:
>>>>
>>>> > Damp parameters have to be configured in a route map with the set
>>>> dampening
>>>> > command
>>>> > ----- Original Message ----- From: "Hobbs" <deadheadblues@gmail.com>
>>>> > To: "akyccie" <akyccie@gmail.com>
>>>> > Cc: <ccielab@groupstudy.com>
>>>> > Sent: Monday, August 04, 2008 12:18 PM
>>>> > Subject: Re: BGP damping
>>>> >
>>>> >
>>>> >
>>>> > The default penalty is 1000 so you don't need to configure it. And as
>>>> far
>>>> >> as
>>>> >> I know, you can't change it.
>>>> >>
>>>> >> hth
>>>> >>
>>>> >> On Mon, Aug 4, 2008 at 10:43 AM, akyccie <akyccie@gmail.com> wrote:
>>>> >>
>>>> >> How to set the penatly of 1000 everytime routes flap. Not getting
>>>> any
>>>> >>> option
>>>> >>> to set panelty.
>>>> >>>
>>>> >>> bgp dampening [half-life reuse suppress
>>>> max-suppress-time]
>>>> >>>
>>>> >>>
>>>> >>> Blogs and organic groups at http://www.ccie.net
>>>> >>>
>>>> >>>
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>>>> >>
>>>> >>
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>>>> >>
>>>> >>
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>>>>
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>>>>
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