From: Kenneth Wygand (KWygand@customonline.com)
Date: Thu May 27 2004 - 11:13:25 GMT-3
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_reference_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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