From: Swaroop Potdar (swarooppotdar@hotmail.com)
Date: Thu Nov 04 2004 - 07:02:12 GMT-3
To IE Team and Groupstudy,
In IEWB lab 15 QOS
In the QOS section where in we need to do the custom-queue to CBWFQ
conversion. The solution guide uses a max-reserved-bandwidth command to
allocate 85% of bandwidth of the line for the CBWFQ policy-map.
But can we modify the default parameters of the line itself when its not
hinted in the question ????
And also the custome-queue assigns weights to the queues defined based on
the ratio between the queues and does not do allocation of bandwidth
directly.
But if we use the "bandwidth percent" command we are directly allocating the
bandwidth and not using the ratio of the weights of the queues which is the
behaviour of the custom-queue as not like PQ.
This happens because in 12.2T there is absolute allocation of bandwidth and
not relative of the available line bandwidth, when the "bandwidth percent"
command is used
So do you feel the "bandwidth remaning percent" command had to be used
instead which acts like the custom-queue allocation based on ratios, going
by the description of the command in the DOC CD and its behaviour.
If this is correct then 12.2T came with a problem and also a solution. :-)
So with this I am pasting the two options available Pls tell me which one is
right.
Your inputs and corrections would be highly valuable.
---------option 1 -----------
policy-map CBWFQ
class www
bandwidth percent 50
class ftp
bandwidth percent 30
class telnet
bandwidth percent 5
( to implement this we have to give a max-reserved-bandwidth command on the
interface as its absolute)
int e0/0
max-reserved-bandwidth 85
service-policy outout CBWFQ
end
------------2----------------
policy-map CBWFQ
class www
bandwidth remaining percent 50
class ftp
bandwidth remaining percent 30
class telnet
bandwidth remaining percent 5
int e0/0
service-policy outout CBWFQ
end
using this we dont have to change any default behaviour of the interface and
moreover we are meeting the behaviour of custom-queuing which acts on ratios
and not absoulte weights..
-----------------------
Thanks in Advance,
Swaroop.
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