Re: change default penalty value for BGP dampening

From: sheherezada@gmail.com
Date: Tue Oct 09 2007 - 05:54:49 ART


OK, I admit it is a wrong idea :) It took me another one minute to
find the update - so here it is the story end:

http://www.ripe.net/docs/routeflap-damping.html

Mihai

On 10/9/07, sheherezada@gmail.com <sheherezada@gmail.com> wrote:
> See "RIPE-210: Coordinated Route Flap Damping Parameters". As far as
> I am concerned, I actually saw this implemented on a full table
> router.
>
> http://www.ripn.net:8080/nic/ripe-docs/ripe-210.txt
>
> Mihai
>
> On 10/9/07, Joseph Brunner <joe@affirmedsystems.com> wrote:
> > Holy hipster batman!
> >
> > If I ran that thing on a router with full tables (228k routes where I'm
> > sitting)
> >
> > I think it would CHOKE
> >
> > A measly "set local pref" runs a 7200vxr's npe-g1's cpu to the hill for like
> > 30 seconds...
> >
> > WOW
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > sheherezada@gmail.com
> > Sent: Tuesday, October 09, 2007 3:12 AM
> > To: Con Spathas
> > Cc: Joseph Saad; Cisco certification
> > Subject: Re: change default penalty value for BGP dampening
> >
> > Yes it's possible. See example below.
> >
> > router bgp 65535
> > bgp dampening route-map gradedFlapDamping
> > !
> > route-map gradedFlapDamping deny 5
> > match ip address prefix-list <your aggregates>
> > !
> > route-map gradedFlapDamping deny 10
> > match ip address prefix-list <dns root servers & stuff>
> > !
> > route-map gradedFlapDamping permit 20
> > match ip address prefix-list <below /24>
> > set dampening 15 820 3000 30
> > !
> > route-map gradedFlapDamping permit 30
> > match ip address prefix-list <larger networks>
> > set dampening 15 750 3000 45
> > !
> > route-map gradedFlapDamping permit 40
> > set dampening 10 1500 3000 30
> >
> > HTH,
> >
> > Mihai Dumitru
> > CCIE #16616 (SP, R&S)
> >
> >
> > On 10/9/07, Con Spathas <con@spathas.net> wrote:
> > > Actually sorry - a little premature ejaculation there on my part.
> > >
> > > I haven't actually seen where you can adjust the "penalty" itself.
> > > Be interested as well now to know if it's possible to change it or not!!
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > > Joseph Saad
> > > Sent: Monday, 8 October 2007 20:24
> > > To: Cisco certification
> > > Subject: change default penalty value for BGP dampening
> > >
> > > As stated in most text books, default penalty value is 1000 per flap for
> > bgp
> > > routes.
> > >
> > > Is there a way to change this default value?
> > >
> > > _______________________________________________________________________
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> > >
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> >
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