From: James Matrisciano (jmatrisciano@kenttech.com)
Date: Mon May 09 2005 - 08:54:34 GMT-3
For traffic shapping, you want to use Cir, Be, Bc and Te
If you know any of the above mentioned, you can figure out the rest with
this...
CIR X Tc / 1000 = Bc
CIR / Bc x 1000 = Tc
CIR - AR x Tc / 1000 = Be
Bc x 1000 / Tc = Cir
On Custom Ques, you need to know how to get the percentages for traffic
to byte counts...
So,
If you need to allocate 30% of BW for WWW traffic with a packet size of
1500 bytes
As well Allocate 20% of BW for ftp traffic with a packet size of
600...do the following
Step 1. Find which has the largest packet size....(1500 for www)
Step 2. Divide all other traffic fields by the largest packet size
1500/1500=1
1500/600=2.5
Step 3. Multiply the #'s that were given by division by the BW
percentage
(in step 2 1500/1500=1) so 1 x 30% (1x .3) = .3
(in step two 600/1500=2.5) so 2.5 x .2 (20%) = .5
Step 4. Take that number, normalize it and round up if needed:
.3 normalized is 3
.5 nrmalized is 5
(for something like .75, normalized is 7.5, you then need to round up to
8)
Step 5. Multiply the normalized number times the original byte count.
3x1500=4500
5x600=3000
Now you can build your custom ques:
Queue-list 1 port ip 1 tcp www
Queue-list 1 port ip 2 tcp ftp
Queue-list 1 port ip 2 tcp ftp-data
Queue-list 1 que 1 byte-count 4500
Queue-list 1 que 2 byte-count 3000
Then apply where applicable
Netmasters has a great write up on this in lab 1 I believe.
jm
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
aji nc
Sent: Monday, May 09, 2005 3:14 AM
To: ccielab@groupstudy.com
Subject: Formulas for calculating QOS Values
Dear all,
Can anybody summarize the formulas for calculating
different QOS values. I am getting lost by seeing
different values at different places.I am looking for
ccie lab recomendations.
Ratelimit:
normal burst = configured rate * (1 byte)/(8 bits) *
1.5 seconds
extended burst = 2 * normal burst
police in MQC : ? is it the same or something
different
FRTS : inside map-class
bc = cir*125/1000 for data
cir*10/1000 for voice
be = (ar-cir)*125/1000 data
be for voice is 0
mincir = cir/2 for data
mincir = cir for voice
frame-relay traffic-rate command : i am lost ?
MQC based frts:
shape command : is the values are same as above or
something diferent ?
Generic traffic shaping : fraffic-shape rate
i am lost!!! can anybody help me ?
where do u use gts and where frts ?
Thanks in advance
Aji.N.C
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