From: G. R. Correia (razzolini80@hotmail.com)
Date: Wed May 14 2003 - 16:11:43 GMT-3
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 > > _____ > >Help
STOP SPAM with the new MSN 8 and >get 2 months FREE* >
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