From: Swaroop Potdar (swarooppotdar@hotmail.com)
Date: Mon Nov 01 2004 - 11:32:53 GMT-3
Hi Scott,
As you pointed out in the first config, if done in 12.2 it will reserve 75%
of the line bandwidth when i tried it still thinks that these total 100% is
absolute and not relative ie( 75% of line bandwdith)
as it gives me a message saying requested 34% bandwidth available only 9%
bandiwdth.
is this the change in 12.2 and 12.2T ???
I am running 12.2.(14)T enterprise plus on 2600
Warm Regards,
Swaroop
>From: "Scott Morris" <swm@emanon.com>
>Reply-To: <swm@emanon.com>
>To: "'Swaroop Potdar'" <swarooppotdar@hotmail.com>,<ccielab@groupstudy.com>
>Subject: RE: CBWFQ Percentage Calculation Doubt
>Date: Mon, 1 Nov 2004 08:42:58 -0500
>
>Looking at your first policy:
>policy-map CBWFQ
> class queue1
> bandwidth percent 22
> class queue2
> bandwidth percent 7
> class queue3
> bandwidth percent 37
> class queue4
> bandwidth percent 34
>
>Those values add up to 100. In 12.2, that will reserve 100% of the
>AVAILABLE bandwidth (75% of line bandwidth). So if you had a 1 Mb line,
>that would reserve 100% of 750K. There still would be 25% leftover for
>'unclassified traffic' which is automatically considered to be
>class-default.
>
>In your second policy:
>policy-map CBWFQ
> class queue1
> bandwidth percent 22
> class queue2
> bandwidth percent 7
> class queue3
> bandwidth percent 37
> class queue4
> bandwidth percent 22
> class class-default
> bandwidth percent 12
>
>You actually specify the class-default configuration. This is acceptable,
>but bear in mind that without the setting your max-reserved-bandwidth to
>100% on the interface, you aren't accomplishing as much as you would think!
>You're giving a guarantee, but a pseudo-limit in weighted round robin
>scheduling by giving a number to the class-default while not changing other
>default behaviors.
>
>As far as which one is correct, that will entirely depend on how your lab
>is
>worded! If you are told to give certain guarantees to otherwise
>unclassified traffic, then you should specify stuff for the class-default.
>If not, leave it alone! Think through what the router will be
>doing/thinking and that should help answer the question!
>
>HTH,
>
>Scott
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Swaroop Potdar
>Sent: Monday, November 01, 2004 8:23 AM
>To: swm@emanon.com; ccielab@groupstudy.com
>Subject: RE: CBWFQ Percentage Calculation Doubt
>
>Hi Scott,
>
>Thanks for your reply....though still have a doubt would appreciate some
>more of your time
>
>
>I am pasting the config below..is the interface config correct i mean can
>we
>
>do reserved bandwidth 100% and if we do so do we have to consider some
>space
>
>for the default class....and on the same interface i have given two
>different service policy variations config which one is correct ?
>
>the one without default class or the one with it. as there is a default
>class by default is it mandatory to use and allocate some percentage or
>leave aside some percentage for it.
>
>
>--------------------------------------------------------
>
>
>interface Ethernet0/0
>ip address 133.1.23.2 255.255.255.128
>ip nbar protocol-discovery
>ip pim sparse-mode
>max-reserved-bandwidth 100
>service-policy output CBWFQ
>half-duplex
>end
>
>1)
>
>class-map match-all queue1
> match protocol telnet
>class-map match-all queue3
> match protocol http
>class-map match-all queue2
> match protocol ftp
>class-map match-all queue4
> match protocol dlsw
>!
>!
>policy-map CBWFQ
> class queue1
> bandwidth percent 22
> class queue2
> bandwidth percent 7
> class queue3
> bandwidth percent 37
> class queue4
> bandwidth percent 34
>!
>
>or
>
>2)
>
>class-map match-all queue1
> match protocol telnet
>class-map match-all queue3
> match protocol http
>class-map match-all queue2
> match protocol ftp
>class-map match-all queue4
> match protocol dlsw
>!
>!
>policy-map CBWFQ
> class queue1
> bandwidth percent 22
> class queue2
> bandwidth percent 7
> class queue3
> bandwidth percent 37
> class queue4
> bandwidth percent 22
> class class-default
> bandwidth percent 12
>!
>
>-----------------------------------------
> >From: "Scott Morris" <swm@emanon.com>
> >Reply-To: "Scott Morris" <swm@emanon.com>
> >To: "'Swaroop Potdar'" <swarooppotdar@hotmail.com>,
> ><ccielab@groupstudy.com>
> >Subject: RE: CBWFQ Percentage Calculation Doubt
> >Date: Mon, 1 Nov 2004 08:08:47 -0500
> >
> >In 12.1, the percentage was calculated based on interface bandwidth,
> >allowed
> >to a max additive value of 75%.
> >
> >In 12.2, this was changed to calculate based on "available bandwidth",
> >which
> >was a pre-calculated value of 75% of the line bandwidth. So you could
> >reserve 100% of this amount.
> >
> >HTH,
> >
> >
> >Scott Morris, MCSE, CCDP, CCIE4 (R&S/ISP-Dial/Security/Service Provider)
> >#4713, JNCIP, CCNA-WAN Switching, CCSP, Cable Communications Specialist,
>IP
> >Telephony Support Specialist, IP Telephony Design Specialist, CISSP
> >CCSI #21903
> >swm@emanon.com
> >
> >
> >
> >
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> >Swaroop Potdar
> >Sent: Monday, November 01, 2004 6:16 AM
> >To: ccielab@groupstudy.com
> >Subject: CBWFQ Percentage Calculation Doubt
> >
> >Hi Group,
> >
> >I wanted to confirm this doubt about CBWFQ,
> >
> >-----------------
> >
> >If in a question the default queue size to be used is not given
> >
> >then;
> >
> >do we have to do the bandwidth calculation without factoring the
> >max-reserved-bandwidth.
> >
> >and if the default queue size for the traffic is given
> >
> >then
> >
> >we have to do the bandwidth percentage calculation as 100% of the
>interface
> >bandwidth
> >
> >?????
> >
> >
> >
> >Regards,
> >Swaroop
> >------------------------------------------------------------------
> >Life Is Short & Sweet.
> >Live It To The Fullest.
> >------------------------------------------------------------------
> >
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>
>Regards,
>Swaroop.
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>Live It To The Fullest.
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>_________________________________________________________________
>Yantras for power and success. Yantras for peace and joy.
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Regards,
Swaroop.
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