Re: WFQ

Hi Gaurav,

As suggested by Martin, can you try to arrange for the errata of the guide
you have. I also have the october 2004 printed version of this book and the
order of packets is what you have in your email, however, I strongly suspect
if that's the correct order.As per my understanding packet 10 should be
dequeued before packet 5 , since it is smaller in size.

Martin,
Is it possible for you to check this specific example in the new version of
the guide and let us know if this is one of the errors in the book.

Thanks,
Ravi

On Sat, Jan 16, 2010 at 9:19 AM, Gaurav Thukral <pearlgaurav_at_gmail.com>wrote:

> Hi Experts,
>
> Waiting for your Replies!!!!!!!!!!!!!!!!!!
>
> Regards,
>
> Gaurav
>
> On Fri, Jan 15, 2010 at 7:12 PM, Martin Dean <mdean_at_diatac.com> wrote:
>
> > You are using the Study guide with a very old printing - my guess is a
> soft
> > pdf version printing Oct 2004.
> > You need the errata for it.
> > It used to on the ciscopress.com site, but I cannot find it now.
> > Email me offline I will send you my copy with all (and there are many)
> > errors.
> >
> > Martin Dean
> > ----- Original Message ----- From: "Gaurav Thukral" <
> pearlgaurav_at_gmail.com
> > >
> > To: "Group study <" <ccielab_at_groupstudy.com>; "Ravi Singh" <
> > way2ccie_at_googlemail.com>
> > Sent: Friday, January 15, 2010 11:09 AM
> > Subject: Re: WFQ
> >
> >
> > Hi Ravi,
> >>
> >> The diagram shows a set of four flow queues, each with four packets of
> >> varying lengths. For the sake of discussion, assume that the SN of the
> >> previously sent packet is zero in this case. Each flow s first packet
> >> arrives at the same instant in time, and all packets for all flows
> arrive
> >> before any more packets can be taken from the WFQ queues.
> >>
> >> Flow 1
> >>
> >> 1500 byte,
> >> Packet4 Packet3 Packet1 Packet1
> >> Precedence 0 SN=194,304,000
> >> SN=145,728,000 SN=97,152,000 SN=48,576,000
> >>
> >>
> >> Flow 2
> >>
> >>
> >> Packet8 Packet7 Packet6 Packet5
> >> 1000 byte, SN=129,536,000
> >> SN=97,152,000 SN=65,536,000 SN=32,384,000
> >> Precedence 0
> >>
> >>
> >> Flow 3
> >>
> >>
> >> Packet12 Packet11 Packet10 Packet9
> >> 500 byte, SN=65,536,000
> >> SN=48,576,000 SN=32,384,000 SN=16,192,000
> >> Precedence 0
> >>
> >>
> >> Flow 4
> >>
> >>
> >> Packet16 Packet15 Packet14 Packet13
> >> 100 byte, SN=12,954,600
> >> SN=9,715,200 SN=6,553,600 SN=3,238,400
> >> Precedence 0
> >>
> >> For the record, the order the packets would exit the interface, assuming
> >> no
> >> other events occur, is 13 first, then 14, followed by 15, 16, 9, 5, 10,
> 1,
> >> 11, 6, 12, 2, 7, 8, 3, 4.
> >>
> >> My question is Why Packet 5 is dequeue first before Packet 10 although
> >> both
> >> have same SN.?
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> --------------------------------------------------------------------------------
> >
> >
> >
> > No virus found in this incoming message.
> > Checked by AVG - www.avg.com
> > Version: 9.0.725 / Virus Database: 270.14.141/2622 - Release Date:
> 01/14/10
> > 19:35:00
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sat Jan 16 2010 - 10:12:16 ART