From: Roger Oliver (divineone@divine-wind.net)
Date: Sun Aug 24 2008 - 02:49:05 ART
Thank you!
I was trying to do the verification but wasn't seeing them applied to
the other routes
Thank you for your help!
> -------- Original Message --------
> Subject: Re: BGP Dampening with Route-maps
> From: Huan Pham <pnhuan@yahoo.com>
> Date: Sat, August 23, 2008 10:44 pm
> To: ccielab@groupstudy.com, Roger Oliver <divineone@divine-wind.net>
>
>
> Hi,
> B
> If you do not have that statement "route-map DAMP permit 50", all other routes that do not match the route-map will not be dampened. This also means they will not be blocked due to this route dampening route-map and will be advertized to other BGP peers (subject to any other policies you may have)
>
> If you do have that statement (i.e "route-map DAMP permit 50") all other routes will be subject to dampening with DEFAULT dampening parameters.
>
> Following commands are usefull in verifying your dampening config (you need to flaps a routes to see the effect of route dampening)
>
> clear ip bgp dampening
> show ip bgp dampened-paths
> show ip bgp flap-statistics
>
> Command reference is good on explainng the default behaviour of bgp dampening command you are using.
>
>
> B
> http://www.cisco.com/en/US/docs/ios/iproute/command/reference/irp_bgp1.html#wp1012660
> bgp dampening [half-life reuse suppress max-suppress-time | route-map map-name]
> route-map map-name (Optional) Name of route map that controls where BGP route dampening is enabled.
> B
> Defaults:
> ---------
> BGP dampening is disabled by default. The following values are used when this command is enabled without configuring any optional arguments:
> half-life: 15 minutes
> reuse: 750
> suppress: 2000
> max-suppress-time: 4 times half-life
>
> --- On Sun, 8/24/08, Roger Oliver <divineone@divine-wind.net> wrote:
>
> From: Roger Oliver <divineone@divine-wind.net>
> Subject: BGP Dampening with Route-maps
> To: ccielab@groupstudy.com
> Date: Sunday, August 24, 2008, 3:19 PM
>
> Group /Wave
>
> So I think understand the Dampening options I put and this config(see
> below)and it makes sense. However do I have to put the third line
> "route-map DAMP permit 50?" if I do not put it what happens? other
> routes will not flow through the router and be passed on?
>
> When I do a "sh ip bgp dampen para" I see the two route-maps being
> applied but there is no other dampening map so that means all other
> routes do not get dampened (I'm pretty sure they do not)?
>
> access-list 50 permit 50.5.5.0 0.0.0.255
> access-list 55 permit 55.5.5.0 0.0.0.255
>
> route-map DAMP permit 10
> match ip add 50
> set dampening 20 800 2400 90
> !
> route-map DAMP permit 20
> match ip add 55
> set dampening 15 700 2000 60
> !
> route-map DAMP permit 50
> !
> router-bgp 500
> bgp dampening route-map DAMP
>
> Anyway thanks for the help...back to the next task while I wait
>
> Roger
>
>
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