From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Thu Feb 26 2004 - 20:14:41 GMT-3
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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