RE: wfq (how to calculate precedence value)

From: zheng yi (drnszgy@xxxxxxxxxxx)
Date: Fri Jan 26 2001 - 03:44:18 GMT-3

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<html><DIV>
<P>Hi Micheale:</P>
<P>How do we caculate this precedence value. Does it base on predefined TCP por
t or dynamic assign base on packet size.</P>
<P>Is there any formula on caculating this precedence value.<BR><BR></P></DIV>
<DIV></DIV>
<DIV></DIV>>From: "Michael E. Flannagan" <MFLANNAG@CISCO.COM>
<DIV></DIV>>Reply-To: "Michael E. Flannagan" <MFLANNAG@CISCO.COM>
<DIV></DIV>>To: Justin Menga <JUSTIN.MENGA@COMPUTERLAND.CO.NZ>
<DIV></DIV>>CC: "'ccielab@groupstudy.com'" <CCIELAB@GROUPSTUDY.COM>
<DIV></DIV>>Subject: RE: wfq
<DIV></DIV>>Date: Thu, 25 Jan 2001 17:03:34 -0500 (EST)
<DIV></DIV>>
<DIV></DIV>>Correct. WFQ uses the formula: Weight = 4096/(Precedence+1). As
such,
<DIV></DIV>>all packets with a given IP Precedence (regardless of which conv
ersation
<DIV></DIV>>they belong to, are weighted equally.
<DIV></DIV>>
<DIV></DIV>> ------------------------------------------------------------
<DIV></DIV>> C i s c o S y s t e m s Michael E. Flannagan
<DIV></DIV>> | | Network Consulting Engineer
<DIV></DIV>> ||| ||| Research Triangle Park, NC
<DIV></DIV>> ||||||| ||||||| (919) 392-4550
<DIV></DIV>> .:|||||||||||:.:|||||||||||:. mflannag@cisco.com
<DIV></DIV>> ------------------------------------------------------------
<DIV></DIV>>
<DIV></DIV>>
<DIV></DIV>>
<DIV></DIV>>On Fri, 26 Jan 2001, Justin Menga wrote:
<DIV></DIV>>
<DIV></DIV>> > Probably better if I used the term 'weighting' - in WFQ, w
eighting is only
<DIV></DIV>> > based on IP precedence (and of course interactive traffic)
....
<DIV></DIV>> >
<DIV></DIV>> > In CBWFQ, you have greater control of the weighting by ass
igning bandwidth
<DIV></DIV>> > to anything that can be classified with an ACL (i.e. all '
conversations'
<DIV></DIV>> > that fit the ACL)
<DIV></DIV>> >
<DIV></DIV>> > Regards,
<DIV></DIV>> >
<DIV></DIV>> > Justin Menga CCIE #6640 MCSE+I CCSE
<DIV></DIV>> > WAN Specialist
<DIV></DIV>> > Computerland New Zealand
<DIV></DIV>> > PO Box 3631, Auckland
<DIV></DIV>> > DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
<DIV></DIV>> > mailto: justin.menga@computerland.co.nz
<DIV></DIV>> >
<DIV></DIV>> >
<DIV></DIV>> > -----Original Message-----
<DIV></DIV>> > From: Michael E. Flannagan [mailto:mflannag@cisco.com]
<DIV></DIV>> > Sent: Friday, 26 January 2001 10:47 a.m.
<DIV></DIV>> > To: Justin Menga
<DIV></DIV>> > Subject: RE: wfq
<DIV></DIV>> >
<DIV></DIV>> >
<DIV></DIV>> > Not true, Justin. CBWFQ allows you to perform QoS per clas
s, not per
<DIV></DIV>> > conversation. That is its fundamental difference. With WFQ
, packets are
<DIV></DIV>> > classified into "conversations" by a mixture of things, in
cluding port and
<DIV></DIV>> > prtocol numbers.
<DIV></DIV>> >
<DIV></DIV>> > ----------------------------------------------------------

--
<DIV></DIV>&gt; &gt; C i s c o S y s t e m s Michael E. Flannagan
<DIV></DIV>&gt; &gt; | | Network Consulting Engineer
<DIV></DIV>&gt; &gt; ||| ||| Research Triangle Park, NC
<DIV></DIV>&gt; &gt; ||||||| ||||||| (919) 392-4550
<DIV></DIV>&gt; &gt; .:|||||||||||:.:|||||||||||:. mflannag@cisco.com
<DIV></DIV>&gt; &gt; ----------------------------------------------------------
--
<DIV></DIV>&gt; &gt;
<DIV></DIV>&gt; &gt;
<DIV></DIV>&gt; &gt;
<DIV></DIV>&gt; &gt; On Tue, 23 Jan 2001, Justin Menga wrote:
<DIV></DIV>&gt; &gt;
<DIV></DIV>&gt; &gt; &gt; Newer IOS feature called LLQ (Low Latency Queueing) w
hich is in reality
<DIV></DIV>&gt; &gt; &gt; Priority Queue Class-Based WFQ.
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; CBWFQ is essentially WFQ except you can classify pack
ets based on
<DIV></DIV>&gt; &gt; IP/TCP/UDP
<DIV></DIV>&gt; &gt; &gt; information (WFQ only used IP precedence to classify)
.
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; PQ-CBWFQ adds a priority queue that is always service
d ahead of the
<DIV></DIV>&gt; &gt; &gt; CBWFQ's...
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; Regards,
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; Justin Menga CCIE #6640 MCSE+I CCSE
<DIV></DIV>&gt; &gt; &gt; WAN Specialist
<DIV></DIV>&gt; &gt; &gt; Computerland New Zealand
<DIV></DIV>&gt; &gt; &gt; PO Box 3631, Auckland
<DIV></DIV>&gt; &gt; &gt; DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
<DIV></DIV>&gt; &gt; &gt; mailto: justin.menga@computerland.co.nz
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; -----Original Message-----
<DIV></DIV>&gt; &gt; &gt; From: Dezso Csonka [mailto:dcsonka@cisco.com]
<DIV></DIV>&gt; &gt; &gt; Sent: Monday, 22 January 2001 11:13 p.m.
<DIV></DIV>&gt; &gt; &gt; To: ccielab@groupstudy.com
<DIV></DIV>&gt; &gt; &gt; Subject: wfq
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; Hi,
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; Is it possible to assigne priority to WFQ? I mean tha
t can I assigne =
<DIV></DIV>&gt; &gt; &gt; traffic like ftp or telnet to WFQ with different prio
rity just like in =
<DIV></DIV>&gt; &gt; &gt; priority queuing?
<DIV></DIV>&gt; &gt; &gt; The problem is that I dont understand how WFQ works.
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; Thanks
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt; Dezs
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt;
<DIV></DIV>&gt; &gt; &gt;

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