From: Michael E. Flannagan (mflannag@xxxxxxxxx)
Date: Mon Feb 05 2001 - 02:57:00 GMT-3
Famous Cisco Answer: It Depends. Do you want to drop excess, or buffer
excess?
------------------------------------------------------------
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 Mon, 5 Feb 2001, Robert DeVito wrote:
> It is available from 1400 through the 7000 series. Everyone out there
> tonight, what is the best way to limit traffic for web to 1.5Mbps? Car or
> GTS?
>
> Cheers..
> Robert
>
>
> ----Original Message Follows----
> From: Derek Buelna <dameon@aracnet.com>
> Reply-To: Derek Buelna <dameon@aracnet.com>
> To: ccielab@groupstudy.com
> Subject: Re: CAR question
> Date: Sun, 04 Feb 2001 20:35:03 -0800
>
> Note that CAR seems to be available only for 7000 7200 and 7500 routers so
> I'm
> wondering if I really need to know about this... Pretty good reading
> though..
>
> -Derek
>
>
> Michael E. Flannagan wrote:
>
> > 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
> > ------------------------------------------------------------
> >
> > 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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