Re: Policing - what happens to violate packets?

From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Mon Jun 26 2006 - 14:40:04 ART

Here,

check this link, it explains how actually CAR treats Be value :)
It's totally different from MQC policer behavior :)

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hqos_c/part20/qchpolsh.htm#wp1000944

HTH 

-- 
Petr Lapukhov, CCIE #16379
petr@internetworkexpert.com

Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Outside US: 775-826-4344

2006/6/26, allboutcisco <frenzeus@streamyx.com>:
>
> Hi Petr,
>
> Thanks for the reply. What do u mean when u say for CAR ""exceed" action
> is
> somewhat "random", to simulate RED  behavior, and depends on Be-Bc
> "margin"."
>
> Thanks.
>
> K
>
> ----- Original Message -----
> From: "Petr Lapukhov" <petr@internetworkexpert.com>
> To: "allboutcisco" <frenzeus@streamyx.com>
> Cc: "Cisco certification" <ccielab@groupstudy.com>
> Sent: Monday, June 26, 2006 7:43 PM
> Subject: Re: Policing - what happens to violate packets?
>
>
> > Hmm, since no *violate* action has been defined, Be value is NOT used
> > actually. All your traffic that exceeds Bc falls under exceed action.
> >
> > This behavior is unlike CAR, where you "exceed" action is somewhat
> > "random", to simulate RED  behavior, and depends on Be-Bc "margin".
> >
> > HTH
> >
> > --
> > Petr Lapukhov, CCIE #16379
> > petr@internetworkexpert.com
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com
> > Toll Free: 877-224-8987
> > Outside US: 775-826-4344
> >
> > 2006/6/26, allboutcisco <frenzeus@streamyx.com>:
> >>
> >> Hi Group,
> >>
> >> Looking at the config below:
> >>
> >> Rack1R2#sh run | b policy-map
> >> policy-map QOS_IN
> >>    class UDP
> >>    police cir 128000 bc 2000 be 2000
> >>      conform-action transmit
> >>      exceed-action set-prec-transmit 0
> >>   class TCP
> >>    police cir 256000 bc 4000 be 8000
> >>      conform-action transmit
> >>      exceed-action set-prec-transmit 0
> >>
> >> Taking class UDP as an example, policing rate for UDP is 128000bps,
> with
> >> a
> >> Bc bucket depth of 2000 bytes & a Be bucket depth of 2000 bytes as
> well.
> >> A
> >> bunch of packets arrive, assuming Bc bucket tokens are all used up to
> >> transmit & excess packets used up all of Be bucket tokens as well where
> >> the
> >> excess action is to set prec to 0 then transmit. Now assuming that
> there
> >> are
> >> still packets & since no action has been defined for violate - what
> >> happens
> >> to those packets?
> >>
> >> Appreciate if someone could advise on this?
> >>
> >> Thanks.
> >>
> >> Cheers,
> >> K
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

This archive was generated by hypermail 2.1.4 : Sat Jul 01 2006 - 07:57:33 ART