Re: WFQ

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 flows 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
>
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>
>
>
>

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Received on Fri Jan 15 2010 - 13:42:56 ART