From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Thu May 27 2004 - 11:15:37 GMT-3
Actually Ken the 100% reservation you have is a better design than the 90%. You are guaranteeing service for traffic not matched by other classes.
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: Kenneth Wygand [mailto:KWygand@customonline.com]
> Sent: Thursday, May 27, 2004 9:13 AM
> To: Gyori Gábor; Carlos G Mendioroz
> Cc: Brian McGahan; ccielab@groupstudy.com
> Subject: RE: bandwidth-percent in class-default
>
> Gabor,
>
> 100% reservation is definitely possible. Whether or not it is
> _recommended_ is another story.
>
> Kenneth E. Wygand
> Systems Engineer, Project Services
> CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
> Network+, A+
> Custom Computer Specialists, Inc.
> "The only unattainable goal is the one not attempted."
> -Anonymous
>
> -----Original Message-----
> From: Gyori Gábor [mailto:Gyori.Gabor@lnx.hu]
> Sent: Thursday, May 27, 2004 10:11 AM
> To: Carlos G Mendioroz; Kenneth Wygand
> Cc: Brian McGahan; ccielab@groupstudy.com
> Subject: RE: bandwidth-percent in class-default
>
> From command reference(
> (http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_r
> eference_chapter09186a00801a7eda.html#wp1113113 ):
>
> The sum of all bandwidth allocation on an interface should not exceed 75
> percent of the available bandwidth on an interface. The remaining 25
> percent of bandwidth is used for overhead, including Layer 2 overhead,
> control traffic, and best-effort traffic.
>
>
>
> If you need to allocate more than 75 percent for RSVP, CBWFQ, LLQ, IP RTP
> Priority, Frame Relay IP RTP Priority, and Frame Relay PIPQ, you can use
> the max-reserved-bandwidth command. The percent argument specifies the
> maximum percentage of the total interface bandwidth that can be used.
>
> If you do use the max-reserved-bandwidth command, make sure that not too
> much bandwidth is taken away from best-effort and control traffic.
>
> So 100% is not a possible reservation I think.
>
> Gabor
>
> -----Original Message-----
> From: Carlos G Mendioroz [mailto:tron@huapi.ba.ar]
> Sent: Thursday, May 27, 2004 11:34 AM
> To: Kenneth Wygand
> Cc: Brian McGahan; ccielab@groupstudy.com
> Subject: Re: bandwidth-percent in class-default
>
>
> I see more of a difference from the fact that you are using 100
> max-reserve-bandwith in the second option, than from setting or not the
> 10% in class default.
>
> This is one case where a "should I modify max-reserve-bandwitdth?"
> question to the proctor would not hurt (IMHO). Setting
> max-reserve-bandwith to 100 does not sound good to me...
>
> Kenneth Wygand wrote:
> > Hey Brian,
> >
> > I see... FTP traffic can basically get more than 90% of traffic with
> > my first configuration during congestion while other traffic would be
> guaranteed the other 10% of traffic during periods of congestion.
> >
> > My real uncertainty lies in the "class-default". Does
> > system-generated traffic (routing processes, etc) fall into this class
> or would that traffic potentially starve if all remaining bandwidth (to
> fill up 100%) was guaranteed in the class-default (of course this could
> only be done by changing the "max-reserve-bandwidth" value to 100%).
> >
> > TIA,
> > Ken
> >
> > -----Original Message-----
> > From: Brian McGahan [mailto:bmcgahan@internetworkexpert.com]
> > Sent: Thu 5/27/2004 1:08 AM
> > To: Kenneth Wygand; ccielab@groupstudy.com
> > Cc:
> > Subject: RE: bandwidth-percent in class-default
> >
> >
> >
> > Ken,
> >
> > Yes there is a difference. In the first configuration non
> FTP
> > traffic is not guaranteed bandwidth in the case of congestion. In
> the
> > second configuration, non FTP traffic is guaranteed 10% of the
> output
> > queue in the case of congestion.
> >
> > 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
> > > Kenneth Wygand
> > > Sent: Wednesday, May 26, 2004 10:04 PM
> > > To: ccielab@groupstudy.com
> > > Subject: bandwidth-percent in class-default
> > >
> > > Is there a difference between the results of the following
> > configurations?
> > >
> > > My requirement is to reserve 90% of the interface bandwidth for
> FTP
> > and
> > > 10% for everything else. Note the explicit "bandwidth-percent"
> > > configuration command under the "class-default" my policy-map.
> > >
> > > <snip>
> > > OPTION 1:
> > > class ftp
> > > match protocol ftp
> > > policy-map 90forFTP
> > > class ftp
> > > bandwidth-percent 90
> > > interface s0
> > > max-reserve-bandwidth 90
> > > service-policy 90forFTP
> > >
> > > OPTION 2:
> > > class ftp
> > > match protocol ftp
> > > policy-map 90forFTP
> > > class ftp
> > > bandwidth-percent 90
> > > class class-default
> > > bandwidth-percent 10
> > > interface s0
> > > max-reserve-bandwidth 100
> > > service-policy 90forFTP
> > > </snip>
> > >
> > > Thanks in advance,
> > > Ken
> > >
> > >
> >
> ____________________________________________________________________
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>
> --
> Carlos G Mendioroz <tron@huapi.ba.ar> LW7 EQI Argentina
>
> _______________________________________________________________________
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