From: john matijevic (matijevi@bellsouth.net)
Date: Wed Jun 30 2004 - 15:37:56 GMT-3
Hello Felice,
I am not sure I understand your question:
Will it meet the requirement for what? Im not sure what you mean by
Class Based Queueing? Do you mean CBWFQ? . Cisco's blessing ??? I'm not
sure what you mean by that statement. As far as the formulas you have
listed below, I believe that for the first would be for using the values
for CAR. So it depends on what type of question you have as to the
formula you would have to use. Perhaps you could provide more specific
information.
Sincerely,
Matijevic
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Felice Russell
Sent: Wednesday, June 30, 2004 1:36 PM
To: ccielab@groupstudy.com
Subject: CQ vs CB & Bc query
I have been trying to comprehend whether Custom Q and Class-based Q
are
interchangeable? Class-based is much easier to configure without all the
tricky math but will it meet the requirement? I thought the ultimate
goal of
CQ was to allocate a percentage of bandwidth to said queue so each queue
receives equal treatment overcoming the queue starvation problems found
with
PQ. So, that being said, with CB the ability to allocate a percentage of
the
bandwidth is readily available the only two things seem to be missing
and I
am not certain how important the first is ... 1) the average packet
ratio 2)
Cisco's blessing. Thoughts? Am I missing something key here?
Additionally, I found some seemingly conflicting inforation regarding
the
calculation for Bc
http://www.cisco.com/en/US/tech/tk543/tk545/technologies_q_and_a_item091
86a0
0800cdfab.shtml
Normal Burst = CIR [BPS] * (1 byte)/(8 bits) * 1.5 seconds
Note: 1.5 seconds is the typical round trip time
Excess Burst = 2 * normal burst
Where "The Frame Relay committed burst size is specified within a map
class to request a certain burst rate for the circuit. Although it is
specified in bits, an implicit time factor is the sampling interval Tc
on
the switch, which is defined as the burst size Bc divided by the
committed
information rate (CIR)."
Which means: Tc = Bc/CIR
Or
Tc * CIR = Bc
http://www.cisco.com/en/US/products/sw/iosswrel/ps1824/products_command_
refe
rence_chapter09186a0080087bcd.html#xtocid106825
So in a THE lab situation which calculation would be correct?
Thanks
Felice
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