Re: WFQ

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
>>
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>>
>>
>>
>>
>>
>>
>>
>>
>
>
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Received on Sat Jan 16 2010 - 14:49:32 ART