From: Roger McNeace (rmcneace@terremark.com)
Date: Wed May 14 2003 - 16:45:17 GMT-3
Even you use "bandwidth percent" your total percentages of bandwidth should
equal 75%, unless you change the max-reserved command. For the LAB I would
assume the default of 75% unless stated otherwise.
-----Original Message-----
From: G. R. Correia [mailto:razzolini80@hotmail.com]
Sent: Wednesday, May 14, 2003 3:12 PM
To: jin.jung@lmco.com; rmcneace@terremark.com; ccielab@groupstudy.com
Subject: RE: Converting Custom Queue to CBWFQ
from Cisco:
" The bandwidth allocated for a priority queue always includes the Layer 2
encapsulation header. However, it does not include other headers, such as
ATM cell tax overheads. When you calculate the amount of bandwidth to
allocate for a given priority class, you must account for the fact that
Layer 2 headers are included. When ATM is used, you must account for the
fact that ATM cell tax overhead is not included. You must also allow
bandwidth for the possibility of jitter introduced by routers in the voice
path.
The sum of all bandwidth allocation on an interface cannot exceed 75 percent
of the total available interface bandwidth. However, under aggressive
circumstances in which you want to configure more than 75 percent of the
interface bandwidth to classes, you can override the 75 percent maximum sum
allocated to all classes or flows using the max-reserved-bandwidth command,
"
But not probably to 100%, due to the overheads previously commented.
I personally think it is easier to use the "bandwith percent" than the
"bandwidth" command; but if you use the "bandwidth" (not bandwidth percent)
you have to multiply by 0.75. The "bandwidht percent" has one count
less....
Cheers
>From: "Jung, Jin"
>To: "'G. R. Correia'" , rmcneace@terremark.com, ccielab@groupstudy.com
>Subject: RE: Converting Custom Queue to CBWFQ
>Date: Wed, 14 May 2003 13:28:25 -0400
>
>I think you have to do *.75,,,
>
>-- let me ask this way,,
>so if you do "max-reserved-bandwidth 100"
>What do you do?
>
>I thinks you have to do *.75 unless you set the max bandwidth to 100.
>
>jin jung...
>
>-----Original Message-----
>From: G. R. Correia [mailto:razzolini80@hotmail.com]
>Sent: Wednesday, May 14, 2003 12:56 PM
>To: rmcneace@terremark.com; jin.jung@lmco.com; ccielab@groupstudy.com
>Subject: RE: Converting Custom Queue to CBWFQ
>
>
>
>IMHO, regarding the bandwith percent command; the 75% is given by the
>command:
>
>wp1001667Router(config-if)# max-reserved-bandwidth
>percentBM_1001665BM_1001666
>
>this command changes the maximum configurable bandwidth for CBWFQ, LLQ, and
>IP RTP Priority
>that by default is 75%; there is no need to multiply by .75.
>so in the example below it should look like:
>
>www - 3000/5500: 55%
>dns - 1500/5500: 27%
>default - 1000/5000: 18%
>
>hth
>
>
>Guilherme
>
>
>
>
>
>
>
> >From: Roger McNeace
> >Reply-To: Roger McNeace
> >To: "'Jung, Jin'" , "'ccielab@groupstudy.com'"
> >Subject: RE: Converting Custom Queue to CBWFQ
> >Date: Wed, 14 May 2003 11:20:11 -0400
> >
> >No not yet, but I figured out a formula for bandwidth and bandwidth
> >percentage
> >
> >byte-count/Total-byte-count * Bandwidth * .75
> >
> >example: Bandwidth 128k
> >
> >www byte count 1500 in custom queue list
> >
> >1500/4500= .333 * 128 = 42.624 * .75 =31.968 (32k of bandwidth)
> >
> >Bandwidth percentage
> >
> >byte-count/Total-byte-count * .75
> >
> >1500/4500= 33 * .75 = 24.75% (25% of bandwidth)
> >
> >Let me know if this makes sense or if you feel this is the correct
>approach.
> >
> >
> >-----Original Message-----
> >From: Jung, Jin [mailto:jin.jung@lmco.com]
> >Sent: Wednesday, May 14, 2003 10:03 AM
> >To: 'Roger McNeace'; 'ccielab@groupstudy.com'
> >Subject: RE: Converting Custom Queue to CBWFQ
> >
> >
> >Did someone answer this for you yet?
> >If not, here is what I have..
> >I am trying to do this with our router. It should be close.
> >Please compare with answers you got and let me know if this is correct.
> >I am also trying to learn this....
> >
> >
> >Class map www
> >Match match-all protocol www
> >Class map dns
> >Match match-all protocol dns
> >
> >Policy map ccie1
> >Class www
> >Bandwidth 52
> >Que-limit 100
> >Class dns
> >Bandwidth 17
> >Que-limit 100
> >Class class-default
> >Bandwidth 26
> >
> >
> >Interface ser 0/0
> >Service policy ccie1 out
> >
> >
> >Assuming ar = 128
> >75% of total traffic.
> >
> >
> >
> >
> >
> >-----Original Message-----
> >From: Roger McNeace [mailto:rmcneace@terremark.com]
> >Sent: Friday, May 09, 2003 2:52 PM
> >To: 'ccielab@groupstudy.com'
> >Subject: Converting Custom Queue to CBWFQ
> >
> >
> >Given the Custom Queue below, could someone show me an example on how to
> >convert this to a CBWFQ list.
> >
> >queue-list 1 protocol ip 1 tcp www
> >queue-list 1 protocol ip 2 tcp dns
> >queue-list 1 default 3
> >queue-list 1 queue 1 limit 100
> >queue-list 1 queue 1 byte-count 3000
> >queue-list 1 queue 2 limit 100
> >queue-list 1 queue 2 byte-count 1000
> >queue-list 1 queue 3 byte-count 1500
>
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