From: Michael E. Flannagan (mflannag@xxxxxxxxx)
Date: Fri Feb 02 2001 - 15:27:32 GMT-3
The first number is bps, the second and third are not.
------------------------------------------------------------
C i s c o S y s t e m s Michael E. Flannagan
| | Network Consulting Engineer
||| ||| Research Triangle Park, NC
||||||| ||||||| (919) 392-4550
.:|||||||||||:.:|||||||||||:. mflannag@cisco.com
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On Fri, 2 Feb 2001, Wade Edwards wrote:
> Sorry I thought it was in bps not Bps.
>
> -----Original Message-----
> From: Nodir Nazarov [mailto:nodir@datatone.com]
> Sent: Friday, February 02, 2001 10:12 AM
> To: Wade Edwards
> Cc: Michael E. Flannagan; David Goldsmith; Robert DeVito;
> ccielab@groupstudy.com
> Subject: RE: CAR question
>
>
>
> Wade,
>
> 450000 bytes is not 0.45 Mbps
>
> 450000 bytes *8 = 3600000 bits.
>
> Nodir
>
>
> On Fri, 2 Feb 2001, Wade Edwards wrote:
>
> > OK I am now confused. How are you getting 6.6 Mbps from the command
> below.
> >
> > rate-limit input access-group 101 3000000 450000 500000 conform-action
> > transmit exceed-action drop
> >
> > It should be 3 Mbps with a normal burst of .45 Mbps and a max burst at .5
> > Mbps. Is the formula first number + second number is normal traffic and
> > first number + second number + first number + third number is the max
> burst
> > rate? I don't understand what is meant by burst then. I thought normal
> > burst was what you are given above the first number and still be within
> your
> > budget and max burst is what will be dropped.
> >
> > I am so confused about CAR now.
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > Michael E. Flannagan
> > Sent: Friday, February 02, 2001 8:55 AM
> > To: David Goldsmith
> > Cc: Robert DeVito; ccielab@groupstudy.com
> > Subject: Re: CAR question
> >
> >
> > Dave is exactly right...I love zeros - just got carried away :-)
> >
> > Sorry for the confusion.
> >
> > ------------------------------------------------------------
> > C i s c o S y s t e m s Michael E. Flannagan
> > | | Network Consulting Engineer
> > ||| ||| Research Triangle Park, NC
> > ||||||| ||||||| (919) 392-4550
> > .:|||||||||||:.:|||||||||||:. mflannag@cisco.com
> > ------------------------------------------------------------
> >
> >
> >
> > On Fri, 2 Feb 2001, David Goldsmith wrote:
> >
> > > Group,
> > >
> > > Actually, that is incorrect. This would allow 3mega bits for the first
> > number
> > > and 3.6 mega bits for the burst.
> > >
> > > the second number is in bytes. This statement will allow 6.6 M bits
> > through.
> > >
> > > Thanks,
> > > Dave
> > >
> > >
> > > "Michael E. Flannagan" wrote:
> > >
> > > > Robert -
> > > >
> > > > Look at it this way. 1st number + 2nd number = where your action
> begins
> > > > to be selectively applied to traffic (in this case, the action is
> > > > 'drop'). The 3rd number is the point beyond which the exceed-action
> > will
> > > > be applied to ALL traffic. If you truly wanted to limit traffic to
> not
> > > > exceed 3.5Mb, then you would want to make sure that rate+Eb = 3.5Mb
> > > >
> > > > ex: rate-limit input access-group 101 3000000 450000 500000
> > conform-action
> > > > transmit exceed-action drop
> > > >
> > > > That would allow up to 3.45Mb of traffic before any action was taken
> and
> > > > would drop *some* traffic between 3.45Mb and 3.5Mb, but would drop all
> > > > traffic over 3.5Mb.
> > > >
> > > > Hope that helps,
> > > >
> > > > ------------------------------------------------------------
> > > > C i s c o S y s t e m s Michael E. Flannagan
> > > > | | Network Consulting Engineer
> > > > ||| ||| Research Triangle Park, NC
> > > > ||||||| ||||||| (919) 392-4550
> > > > .:|||||||||||:.:|||||||||||:. mflannag@cisco.com
> > > > ------------------------------------------------------------
> > > >
> > > > On Fri, 2 Feb 2001, Robert DeVito wrote:
> > > >
> > > > > If I wanted to limit SMTP to 3.5 MB on my ethernet port I would do
> the
> > > > > following?
> > > > >
> > > > > rate-limit input access-group 101 3500000 8000 8000 conform-action
> > transmit
> > > > > exceed-limit drop
> > > > > !
> > > > > access-list 101 permit tcp any any eq smtp
> > > > >
> > > > > My question is, when configuring CAR, it requires me to add the bps
> > > > > burst-normal and burst-max. If I came across an scenario when it ask
> > me to
> > > > > limit bandwidth to a specific protocol, in this case smtp, to
> 3.5mbs,
> > if I
> > > > > configure it to burst 8k, I am really not limiting it to 3.5mbs. Am
> I
> > > > > thinking correctly? Is there a different way of doing this?
> > > > >
> > > > > Thank you,
> > > > > RobertRobert DeVito
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