From: Karim (karim_ccie@hotmail.com)
Date: Thu Feb 26 2004 - 20:45:48 GMT-3
Hi Brian,
Suppose that we have the following:
- A customer pvc of 512K.
- Port speed (interface bandwidth) of 2M.
- And 64K is reserved for RTP.
- 64K for LLQ.
What will be the bandwidth value to be configured using the interface "
bandwidth" command ??
Would it be bandwidth 512, or bandwidth 512* 0.75, or something else
(confused how RTP value will be involved).
Regards,
Karim.
----- Original Message -----
From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
To: "'Packet Man'" <ccie2b@hotmail.com>; <deivi78@hotmail.com>;
<antonio.sanchez-monge@hp.com>; <msnyder@revolutioncomputer.com>;
<ccielab@groupstudy.com>
Cc: <alsontra@hotmail.com>
Sent: Friday, February 27, 2004 1:14 AM
Subject: RE: MQC for bandwidth reservation (max-reserved-bandwidth 100)
> The interface "bandwidth" command is what the available bandwidth
> value is based off of.
>
> Available bandwidth = (interface_bandwidth * max-reserved-bandwidth/100) -
> RTP - LLQ - RSVP
>
> The reason you would need to specify the bandwidth value is when the
> provisioned rate of the interface does not match the interface bandwidth
> command. For example, suppose you have a 1Mbps circuit you are leasing
that
> is dropped off as FastEthernet. Although the interface bandwidth is
> 100Mbps, it would not make sense to calculate a QoS policy on 100Mbps, as
> the upstream provider is policing at 1Mbps. Therefore the "bandwidth"
value
> should be adjusted to 1Mbps.
>
>
> 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: Packet Man [mailto:ccie2b@hotmail.com]
> > Sent: Thursday, February 26, 2004 2:31 PM
> > To: deivi78@hotmail.com; bmcgahan@internetworkexpert.com;
antonio.sanchez-
> > monge@hp.com; msnyder@revolutioncomputer.com; ccielab@groupstudy.com
> > Cc: alsontra@hotmail.com
> > Subject: RE: MQC for bandwidth reservation (max-reserved-bandwidth 100)
> >
> > Hi,
> >
> > I'm not positive about this but my guess and what I've heard is that the
> > bandwidth interface command's function is to let the routing protocol
how
> > much bandwidth is avaiable on a link which in turn some portocols use to
> > compute cost or metric (OSPF or Eigrp).
> >
> > I don't know what bandwidth QoS uses or where it gets the bandwidth
amount
> > when it needs to compute a percentage. But, I do know that with some
QoS
> > features, various parameters should be based on the actual bandwidth
> > rather
> > than the policed or shaped bandwidth. I don't remember all the details,
> > but
> > I came across this info in the DQoS book.
> >
> > HTH
> >
> >
> >
> > >From: "David Hurtado" <deivi78@hotmail.com>
> > >Reply-To: "David Hurtado" <deivi78@hotmail.com>
> > >To: bmcgahan@internetworkexpert.com, antonio.sanchez-monge@hp.com,
> > >msnyder@revolutioncomputer.com, ccielab@groupstudy.com
> > >CC: alsontra@hotmail.com
> > >Subject: RE: MQC for bandwidth reservation (max-reserved-bandwidth 100)
> > >Date: Thu, 26 Feb 2004 19:52:55 +0000
> > >
> > >Hello everybody,
> > >
> > >I stiil don't know why to use the "bandwidth" command in interface mode
> > >when configuring CBWFQ if you are respecting the
> > >maximum-reserve-bandwidth limitation:
> > >
> > > For example:
> > >
> > >class-map match-all ICMP
> > >match access-group 101
> > >
> > > policy-map ICMP_BW
> > >class ICMP
> > >bandwidth 128
> > >
> > > interface fa1/0/0
> > >bandwidth 1500 <-----------------------------When does this need to
> > > be
> > > specified?
> > >service-policy output ICMP_BW
> > >
> > >128 kbps is not over 75% of the FastEternet BW. Why do i have to
> > >configure "bandwidth 1500"?
> > >
> > >Could somebody explain it to me, please?
> > >
> > >Thanks a lot
> > >
> > > >From: "Brian McGahan" >Reply-To: "Brian McGahan" >To:
> > >"'SANCHEZ-MONGE,ANTONIO (HP-France,ex2)'" , "'Michael Snyder'" ,
> > > >CC: >Subject: RE: MQC for bandwidth reservation
(max-reserved-bandwidth
> > >100) >Date: Wed, 25 Feb 2004 14:24:08 -0600 > > As long as you take
this
> > >network traffic into account you are fine. >For example, on a GigE
link,
> > >it's a little ridiculous to say that 250Mbps of >traffic will be
network
> > >traffic. If you configure a class (i.e. not >class-default) which
> > >matches your routing traffic and network traffic and >reserve the
> > >appropriate bandwidth for it you are fine. > > Depending on the
platform
> > >the router may employ it's own queueing >strategy for essential network
> > >control traffic. For more info see this cco >doc: >
> > > >http://www.cisco.com/warp/public/105/rtgupdates.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: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
Behalf
> > >Of > > SANCHEZ-MONGE,ANTONIO (HP-France,ex2) > > Sent: Wednesday,
> > >February 25, 2004 10:07 AM > > To: 'Michael Snyder';
> > >ccielab@groupstudy.com > > Cc: alsontra@hotmail.com > > Subject: RE:
MQC
> > >for bandwidth reservation (max-reserved-bandwidth 100) > > > > Hi
> > >Michael, > > > > -> Won't max-reserved-bandwidth 100 be a good default
> > >command to use with > > MQC interfaces? > > > > Reserving 100% of the
> > >total bandwidth may starve the router generated > > traffic and break
> > >routing protocols and other essential management > > traffic. > >
That's
> > >why it is 75% by default and not 100%. > > > > Cheers, > > Ato. > > > >
> > >-----Original Message----- > > From: Michael Snyder
> > >[mailto:msnyder@revolutioncomputer.com] > > Sent: miircoles, 25 de
> > >febrero de 2004 16:52 > > To: ccielab@groupstudy.com > > Cc:
> > >alsontra@hotmail.com > > Subject: RE: MQC for bandwidth reservation
> > >(max-reserved-bandwidth 100) > > > > > > Well, if you are using more
that
> > >75% of the bandwidth value (per the show > > int cmd) then you need to
up
> > >the upper limit. > > > > R8(config-if)#max-reserved-bandwidth 100 > > >
>
> > >Which brings up a question, > > > > Won't max-reserved-bandwidth 100 be
a
> > >good default command to use with MQC > > interfaces? > > > > > > > > >
>
> > > > > -----Original Message----- > > From: alsontra@hotmail.com
> > >[mailto:alsontra@hotmail.com] > > Sent: Wednesday, February 25, 2004
> > >11:08 AM > > To: SANCHEZ-MONGE,ANTONIO (HP-France,ex2);
> > >ccielab@groupstudy.com > > Subject: Re: MQC for bandwidth reservation >
>
> > > > > Thank you Ato. > > > > My question was more in regards of whether
or
> > >not you have to specify the > > command when reserving bandwidth. I've
> > >seen MQC configurations with and > > without the interface level
> > >bandwidth command. I think your saying that I > > only need to specify
> > >bandwidth if the reference bandwidth is different > > than > > the
> > >interface bandwidth. > > > > > > Thanks > > Alsontra > > > > > > > > >
>
> > >----- Original Message ----- > > From: "SANCHEZ-MONGE,ANTONIO
> > >(HP-France,ex2)" > > monge@hp.com> > > To: ; > > Sent: Wednesday,
> > >February 25, 2004 2:29 AM > > Subject: RE: MQC for bandwidth
reservation
> > > > > > > > > Hi Alsontra, > > > > Both bandwidth commands have very
> > >different meanings. > > > > Under the interface, it means the total
> > >reference bandwidth. Used for QoS > > but also for routing protocols,
> > >etc... Normally you need to change it in > > serial interfaces where
the
> > >real bandwidth is different from T1, etc... > > > > Under the class in
a
> > >policy map, it is the bandwidth you want to reserve > > for > > a
> > >particular class. The total reserved bandwidth cannot exceed by default
>
> > > > 75% of the reference bandwidth. > > > > Cheers, > > Ato. > > > >
> > >-----Original Message----- > > From: nobody@groupstudy.com
> > >[mailto:nobody@groupstudy.com] On Behalf Of > > alsontra@hotmail.com >
>
> > >Sent: miircoles, 25 de febrero de 2004 11:01 > > To:
> > >ccielab@groupstudy.com > > Subject: MQC for bandwidth reservation > > >
>
> > > > > When is the interface level bandwidth command used or needed with
> > >MQC? > > > > For example: > > > > class-map match-all ICMP > > match
> > >access-group 101 > > > > policy-map ICMP_BW > > class ICMP > >
> > >bandwidth 128 > > > > interface fa1/0/0 >
> > > > bandwidth 1500 <-----------------------------When does this
need
> > >to > > be > > specified? > > service-policy output ICMP_BW > > > >
>
> > > > > > If I don't specify this, what value dose the interface policy
use?
> > >The > > interface bandwidth rate? And if so why would I want to change
> > >it? > > > > > > Alsontra > > > >
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