From: Marc Russell (mrussell@xxxxxxxxxxxxxx)
Date: Mon Feb 05 2001 - 01:46:55 GMT-3
I have setup CAR on 2600 and 3600 series routers. So it is there and you
should know it.
Marc Russell
www.ccbootcamp.com
-----Original Message-----
From: Derek Buelna [mailto:dameon@aracnet.com]
Sent: Sunday, February 04, 2001 11:35 PM
To: ccielab@groupstudy.com
Subject: Re: CAR question
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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