From: Salman Abbas (dukelondon@gmail.com)
Date: Thu Nov 23 2006 - 10:53:33 ART
Hi Alexei,
Thanks again for the confirmation. If we were to use the rate-limit legacy
command for this question, i would have to configure CIR, bc and be values.
I understand that the calculation that you've suggested is for Bc(Normal
Burst). What about Be(Excess burst)? how will we calculate that? From the
Internetwork Expert workbook, I remember the formula:
Bc = CIR x Tc/1000
Be = (AR - CIR) x Tc/1000
Default Tc value is 125ms.
Ivan mentioned that the formula for calculating Bc is CIR/8 x 1.5
Hi Ivan,
What formula should I use to calculate the Be for my rate-limit command?
Cheers,
Salman
On 11/23/06, Alexei Monastyrnyi <alexeim@orcsoftware.com> wrote:
>
> Sounds right to me....
>
> Is the anyone who can shed some light on normal burst value?
>
> I remember reading that this is what we can allow above police rate,
> but can't find a source that easy.
>
> A.
>
> Salman Abbas wrote:
> > Hi Alexei,
> >
> > Thanks for the reply. Just to confirm whether I've correctly
> > understood u or not, Lets say the question says: maximum is 256kbps
> > and normal is 64Kbps, would that mean that I'll do
> >
> > Normal bytes = 256k - 64k = 192k => to bytes 24000, so the police
> > command would be
> >
> > police 64000 24000 exceed action drop
> >
> > Regards,
> >
> > Salman
> >
> >
> > On 11/23/06, *Alexei Monastyrnyi* <alexeim@orcsoftware.com
> > <mailto:alexeim@orcsoftware.com>> wrote:
> >
> > Hi.
> >
> > If I understand it right from DocCD, normal burst is what you have
> > above
> > the police rate. 256k-128k=128k => to bytes 16000/ If it should be
> > considered together with police rate, then just 256k=>32000 bytes.
> In
> > either case police rate should be 128000, not 256000 IMO.
> >
> > I would go for
> > police 128000 16000 exceed action drop
> >
> > HTH
> > a.
> >
> > Salman Abbas wrote:
> > > Hi guys,
> > >
> > > Pls help to answer the following question:
> > >
> > >
> > > On SW1 int fa0/6, limit all UDP traffic by maximum 256Kbps and
> > normal
> > > 128Kbps to avoid congestion on your VLAN.
> > >
> > >
> > > My solution is:
> > >
> > > mls qos
> > > access-list 101 permit udp any any
> > >
> > > class-map LIMIT
> > > match access-group 101
> > >
> > > policy-map POLICE
> > > class LIMIT
> > > police 256000 _____ exceed action drop
> > >
> > > int fa0/6
> > > service-policy input POLICE
> > >
> > > Now the part that I dont understand is that second value in the
> > police
> > > command which is "Burst in bytes". How can I calculate it based
> > on the
> > > question above? Also, am I missing anyting else in my
> configuration?
> > >
> > >
> > > Thanks in advance,
> > >
> > > Cheers!!!
> > >
> > > Salman
This archive was generated by hypermail 2.1.4 : Fri Dec 01 2006 - 08:05:48 ART