From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Wed Apr 14 2004 - 13:28:43 GMT-3
Zack,
You're not forced to do FRTS, but in most practical applications
you would. If you apply a service-policy to an interface without FRTS
it applies to all VCs as an aggregate. For example if you police
traffic to 640Kbps, then as a whole all VCs together cannot exceed
640Kbps, but there is no control on a per-VC basis. When applied
through FRTS each VC uses a separate output queue. In that case you can
apply different QoS parameters on a per VC basis. For example FTP
traffic could be reserved 100Kbps on one VC, and policed to 8Kbps on
another.
How the MQC interacts with VC based media such as Frame Relay
and ATM can get a little complicated, because although there are
separate VC queues they are all still using the same transmit ring
(hardware queue) of the interface. Therefore you can run into some
platform specific issues depending if the platform is VIP enabled or
not.
For more info see the following link:
http://www.cisco.com/warp/public/105/cbwfq_frpvs.html
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: Zack Damen [mailto:zack@supertux.com]
> Sent: Wednesday, April 14, 2004 3:31 AM
> To: Brian McGahan
> Subject: RE: RE: Bandwidth Available
>
> Then your forced to use FRTS? What does the bandwidth command on the
VC do
> for you then in term of queuing if anything? Would this be the same
for
> ATM
> PVC? Any help in the matter Brian would be great.
>
> Zack
>
> At 06:15 PM 4/13/2004, you wrote:
> >Zack,
> >
> > If you are doing per-VC queueing (i.e. via FRTS) then the
output
> >queue of one VC is independent of the output queue of another.
> >Furthermore the "available bandwidth" value of a VC is then based on
the
> >"frame-relay mincir" value.
> >
> >
> >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
> > > Zack Damen
> > > Sent: Tuesday, April 13, 2004 11:39 AM
> > > To: gladston@br.ibm.com; ccielab@groupstudy.com
> > > Subject: Re: RE: Bandwidth Available
> > >
> > > Can some one explain to me how you would do this in regards to
> > > sub-interface on a frame-relay circuit. Lets say that you have a
512
> >pvc,
> > > and you want to allocate the normal 25% of that for OSPF network
> >control
> > > traffic, and the rest of the 75 % of the traffic to VoIP. My
question
> >is
> > > if
> > > the bandwidth is calculated out of the phyical interface at 1536,
and
> >you
> > > have this 512 sub on that interface, how do you do the calculation
in
> > > terms
> > > of the PVC without putting on FRTS.
> > >
> > > so that I have out of 512, 128k goes to ospf network control
traffic,
> > > 384k
> > > to VoIP? I guess I don't understand what happens with the network
> >control
> > > traffic on sub interface when you want 25% of the sub to go to
lets
> >say
> > > ospf with out touching the max controlled bandwidth.
> > >
> > > ZD
> > >
> > >
> > > At 08:29 AM 4/13/2004, gladston@br.ibm.com wrote:
> > > >Thanks,
> > > >
> > > >The doc says:
> > > >
> > > >"Essentially, you are specifying the ratio of the bandwidth to be
> > > >allocated to the traffic class.... The sum of the numbers used to
> > > indicate
> > > >this ratio cannot exceed 100 percent."
> > > >
> > > >"By default, when the bandwidth percent and priority percent
commands
> >are
> > > >used to allocate bandwidth, the sum of the bandwidth percentage
> >allocated
> > > >to the high priority traffic and the bandwidth percentage
allocated
> >to
> > > the
> > > >non-priority traffic cannot exceed 75 percent of the total
bandwidth
> > > >available on the interface."
> > > >
> > > >If I understood, if you configure just bandwidth percent, it is
> >possible
> > > >to configure up to 100%. If you configure bandwidth percent +
> >priority
> > > >percent, percent should be less than 75%.
> > > >I can not see the logical on this. For example, if configuring:
> > > >
> > > >class VOICE
> > > >priority percent 10
> > > >class FTP
> > > >bandwitdh percent 65
> > > >
> > > >You are reserving 25% for control protocols. It is not allowed to
> > > >configure more than 65% to FTP traffic
> > > >
> > > >If configuring
> > > >class FTP
> > > >bandwidth percent 100%
> > > >
> > > >What does happen with the control protocols?
> > > >
> > >
> >
>_______________________________________________________________________
> > > >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
This archive was generated by hypermail 2.1.4 : Mon May 03 2004 - 19:48:47 GMT-3