From: ccie2be (ccie2be@nyc.rr.com)
Date: Sun Dec 07 2003 - 17:25:40 GMT-3
Thank you for pointing out that link. I read it and it was very helpful.
dt
----- Original Message -----
From: "Bob Sinclair" <bsin@cox.net>
To: "Anas Tarsha" <ra3i@yahoo.com>; "ccie2be" <ccie2be@nyc.rr.com>; "Group
Study" <ccielab@groupstudy.com>
Sent: Saturday, December 06, 2003 9:51 PM
Subject: Re: CAR vs Police
> Anas,
>
> I would agree that Cisco could do a better job of explaining the policing
> mechanism in the MQC, but I think I would disagree that it permits
buffering
> during congestion. There are Bc and Be parameters, but according to the
> documentation this does not buffer packets to shape the traffic. The best
> explanation I have found is at the link below, which says that the policer
> does not buffer, but "drops packets less aggressively" during congestion.
> Could you check it out and see what you think of it?
>
>
http://www.cisco.com/en/US/partner/tech/tk543/tk545/technologies_q_and_a_item09186a00800cdfab.shtml#Q24
>
> Thanks!
>
> -Bob Sinclair
> CCIE #10427, CISSP, MCSE
>
>
> bsinclair@netmasterclass.net
> ----- Original Message -----
> From: "Anas Tarsha" <ra3i@yahoo.com>
> To: "Bob Sinclair" <bsin@cox.net>; "ccie2be" <ccie2be@nyc.rr.com>; "Group
> Study" <ccielab@groupstudy.com>
> Sent: Saturday, December 06, 2003 9:07 PM
> Subject: Re: CAR vs Police
>
>
> > Also theoretically there is a major difference between
> > CAR and policing, a difference which Cisco hardly
> > explains it well in my opinion. CAR is a rate-limit
> > mechanism to limit the input or output transmission
> > rate on an interface or subinterface based on a
> > configured value. All the exceeding traffic is dropped
> > in case the exceeding action is dropping. Policing is
> > more like a shaping mechanism. As the name implies,
> > shaping does not drop packets in case of congestion,
> > it buffers them. You will see delay but no data loss.
> > So this is the major difference, CAR does not buffer.
> >
> > Anas
> >
> > --- Bob Sinclair <bsin@cox.net> wrote:
> > > dt,
> > >
> > > Cisco considers CAR to be legacy, is not developing
> > > new features for it, and
> > > discourages its use. As far as functionality goes,
> > > class-based policing
> > > allows more extensive match criteria, including
> > > NBAR, CoS, and RTP port
> > > numbers. The major difference appears to be support
> > > for RFC 2697 and 2698,
> > > which add the Violate action and the Peak
> > > Information Rate. You can find a
> > > detailed comparison of the two at the following
> > > link:
> > >
> > >
> >
>
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_tech_note09186a00800d7276.shtml#topic5
> > >
> > > Hope that helps,
> > >
> > > -Bob Sinclair
> > > CCIE #10427, CISSP, MCSE
> > > bsinclair@netmasterclass.net
> > >
> > >
> > > ----- Original Message -----
> > > From: "ccie2be" <ccie2be@nyc.rr.com>
> > > To: "Group Study" <ccielab@groupstudy.com>
> > > Sent: Saturday, December 06, 2003 10:13 AM
> > > Subject: CAR vs Police
> > >
> > >
> > > > Hi Group,
> > > >
> > > > Aside from the fact that the above features are
> > > configured differently
> > > (CAR
> > > > uses the "rate-limit" command and "Police" is used
> > > within the MQC), is
> > > there
> > > > any difference in functionality?
> > > >
> > > > If there are differences, could someone explain
> > > what they are and what
> > > > specific requirements would require the use of one
> > > rather then the other.
> > > >
> > > > Thanks, dt
> > > >
> > > >
> > >
> > _______________________________________________________________________
> > > > Please help support GroupStudy by purchasing your
> > > study materials from:
> > > > http://shop.groupstudy.com
> > > >
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> > >
> > >
> > _______________________________________________________________________
> > > Please help support GroupStudy by purchasing your
> > > study materials from:
> > > http://shop.groupstudy.com
> > >
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> > __________________________________
> > Do you Yahoo!?
> > Protect your identity with Yahoo! Mail AddressGuard
> > http://antispam.yahoo.com/whatsnewfree
> >
> > _______________________________________________________________________
> > Please help support GroupStudy by purchasing your study materials from:
> > http://shop.groupstudy.com
> >
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Jan 03 2004 - 08:25:37 GMT-3