From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Tue Mar 09 2004 - 20:20:08 GMT-3
Alsontra,
Either would accomplish (pretty much) the same thing. Shaping
traffic will cause the router to buffer excess traffic and send it when
credit has accumulated, and only drop once the shaping buffer is full.
Policing will cause the router to simply drop traffic in excess of the
target rate, telling the sender (assuming a TCP flow) to slow down.
Typically shaping is used to keep tabs on your own outbound traffic
flow, while policing is used to control an inbound flow you are receiving,
but policing can be applied outbound as well.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> alsontra@hotmail.com
> Sent: Tuesday, March 09, 2004 4:46 PM
> To: Brian McGahan; 'Edwards, Andrew M'; 'Marvin Greenlee'; 'Ahmed Mustafa'
> Cc: ccielab@groupstudy.com
> Subject: Re: QOS for real scenerio
>
> Brian,
>
> What are your reason for not using shaping? Are you basing your decision
> upon the requirement that server not violate the 256k limit? Just curious.
>
> Thanks,
> Alsontra
>
>
> ----- Original Message -----
> From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
> To: "'Edwards, Andrew M'" <andrew.m.edwards@boeing.com>;
> <alsontra@hotmail.com>; "'Marvin Greenlee'" <marvingreenlee@yahoo.com>;
> "'Ahmed Mustafa'" <ahmed.mustafa@sbcglobal.net>
> Cc: <ccielab@groupstudy.com>
> Sent: Tuesday, March 09, 2004 12:14 PM
> Subject: RE: QOS for real scenerio
>
>
> > This of course is assuming that the application itself supports RSVP
> > reservations. Configuring RSVP in your network is really only part of
> the
> > end to end RSVP process. You're basically telling the network to get
> ready
> > in case someone wants to reserve bandwidth. The application must then
> come
> > in and say, hey I need X amount of bandwidth now, and the network will
> > comply.
> >
> > From the listed requirement it would seem that something like the
> > following configuration would be more appropriate:
> >
> > policy-map GUARANTEED
> > class QOS
> > bandwidth 256
> > police cir 256000
> >
> > This will guarantee 256Kbps of the output queue for class QOS when
> > there is congestion, but will also police the rate that class QOS
> attempts
> > to leave the queue to 256Kbps.
> >
> >
> > HTH,
> >
> > Brian McGahan, CCIE #8593
> > bmcgahan@internetworkexpert.com
> >
> > Internetwork Expert, Inc.
> > http://www.InternetworkExpert.com
> > Toll Free: 877-224-8987 x 705
> > Outside US: 775-826-4344 x 705
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Edwards, Andrew M
> > Sent: Tuesday, March 09, 2004 8:54 AM
> > To: alsontra@hotmail.com; Marvin Greenlee; Ahmed Mustafa
> > Cc: ccielab@groupstudy.com
> > Subject: RE: QOS for real scenerio
> >
> > Shaping, in my mind, would be the better choice. Of course, if you
> have
> a
> > specific bandwidth requirement that MUST be ensured, I would go with
> RSVP.
> >
> > That way you know the bandwidth is there...
> >
> > Another option would be custom que lists where you can use bandwidth as
> a
> > consideration for the link. But if its end to end I would use RSVP.
> >
> > andy
> >
> > -----Original Message-----
> > From: alsontra@hotmail.com [mailto:alsontra@hotmail.com]
> > Sent: Tuesday, March 09, 2004 2:10 AM
> > To: Marvin Greenlee; Ahmed Mustafa
> > Cc: ccielab@groupstudy.com
> > Subject: Re: QOS for real scenerio
> >
> >
> > Would you want police or shape? Although policing would keep your
> servers
> > utilization 256k, wouldn't shaping provide you with smoother traffic
> > patterns, in addition to less packet loss??? Rookie question, I know.
> :-)
> >
> > Alsontra
> >
> >
> >
> > ----- Original Message -----
> > From: "Marvin Greenlee" <marvingreenlee@yahoo.com>
> > To: "Ahmed Mustafa" <ahmed.mustafa@sbcglobal.net>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Monday, March 08, 2004 11:56 PM
> > Subject: Re: QOS for real scenerio
> >
> >
> > > For assigned maximum bandwidth, you can use the police command.
> > >
> > > Policy-map GURANTEED
> > > class QOS
> > > police 256000 8000 exceed-action drop
> > >
> > > Port numbers will give you more granularity for the
> > > traffic you are limiting.
> > >
> > > Assuming that you want the QoS for the link between
> > > the server and the clients, you will need to configure
> > > it on both sides.
> > >
> > > Sincerely,
> > > Marvin Greenlee
> > > Network Learning, Inc
> > > Senior Technical Advisor
> > >
> > > --- Ahmed Mustafa <ahmed.mustafa@sbcglobal.net> wrote:
> > > > I am working on a real scenerio where specfically
> > > > asked for assigned bandwidth
> > > > 256K for ip address 172.16.10.1 (Running as an
> > > > application server) regardless
> > > > of congestion.
> > > >
> > > > If I configure CBWFQ where I can assign bandwidth:
> > > >
> > > > Router (Where Application Server)
> > > > ---------------------------------------------------
> > > >
> > > > access-list 100 permit ip host 172.16.10.1 any
> > > >
> > > > class-map QOS
> > > > match access-group 100
> > > >
> > > > Policy-map GURANTEED
> > > > class QOS
> > > > bandwidth 256
> > > >
> > > > int s0/0:0
> > > > service-policy output GURANTEED.
> > > >
> > > >
> > > >
> > > > Remote Router (Where hosts are)
> > > > ---------------------------------------------------
> > > >
> > > > access-list 100 permit ip any host 172.16.10.1
> > > >
> > > > class-map QOS
> > > > match access-group 100
> > > >
> > > > Policy-map GURANTEED
> > > > class QOS
> > > > bandwidth 256
> > > >
> > > > int s0/0:0
> > > > service-policy output GURANTEED.
> > > >
> > > >
> > > ----------------------------------------------------------------------
> > > --
> > > >
> > > >
> > > > The above QOS only occurs incase of congestion.
> > > >
> > > > What QOS can be configured regardless of
> > > > congestion, and always gurantee
> > > > bandwidth 256KB only. When I Say 256KB only I mean
> > > > it shouldn't exceed 256KB
> > > > regardless of bandwidth availble or not.
> > > >
> > > >
> > > > In access-list, will port numbers make any huge
> > > > difference. It's an old
> > > > application and port# is not known unless we through sniffer.
> > > >
> > > >
> > > > Should QOS configurations apply both ways as I am
> > > > mentioning above, or on a
> > > > router only where the application server is.
> > > >
> > > > Thanks
> > > >
> > > >
> > >
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