From: kumara.shunmugam@wipro.com
Date: Sat Jul 02 2005 - 09:19:47 GMT-3
Dear Guys
The wrr-queue bandwidth command is not actually allocating real bandwidth to each queues.This command to assign weighted round robin (WRR) weights to the egress queues on a port. The ratio of the weights is the ratio of frequency in which the WRR scheduler dequeues packets from each queue. The more weight will dequeue more packets from a queue when compare to other one.For example, if one queue has a weight of 3 and another has a weight of 4, three packets are sent from the first queue for every four that are sent from the second queue
The other Command is there,"wrr-queue queue-limit" which is used to configure the size of each queue in egress ports. But I think this will only work in Gigabyte ports on 3550 ....
Moreover,one queue will not share the bandwidth to other if it is idle.
Regards
Shunmugam
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Richard Dumoulin
Sent: Saturday, July 02, 2005 12:38 AM
To: Joe Smith; kenbar3@gmail.com; silamoni@yahoo.com; ccielab@groupstudy.com
Subject: RE: 3550 QoS
Also if one of the queues is empty of course that the remaining bandwidth is available for the rest! The percentages assigned are minimum bandwidth values used when there is congestion.
Last, Hertz is a unit of frequency and not bandwidth,
-- Richard
-----Original Message-----
From: Joe Smith [mailto:j333smith@hotmail.com]
Sent: Friday, July 01, 2005 8:50 PM
To: kenbar3@gmail.com; silamoni@yahoo.com; ccielab@groupstudy.com
Subject: RE: 3550 QoS
If you use the command wrr-queue bandwidth 1 2 3 4 its not 25% for each
queue.
Queue 1 would be 1/(1+2+3+4) = 1/10 = 10%
Queue 2 would be 2/(1+2+3+4) = 2/10 = 20%
Queue 3 would be 3/(1+2+3+4) = 3/10 = 30%
Queue 4 would be 4/(1+2+3+4) = 4/10 = 40%
The default if you dont use this command is 25% for each queue, and of
course this will change if you activate the priority queue.
>From: "Ken Bartlinski" <kenbar3@gmail.com>
>Reply-To: "Ken Bartlinski" <kenbar3@gmail.com>
>To: "'Sila Moni'" <silamoni@yahoo.com>, <ccielab@groupstudy.com>
>Subject: RE: 3550 QoS
>Date: Fri, 1 Jul 2005 14:07:03 -0400
>
>Sila,
>
>As far as I know you can not adjust the amount of bandwidth assigned to
>each
>queue on the 3550. This is just a by product of how many queues you have
>configured.
>
>When 4 queues are configured each get 25%. If two queues are configured
>each
>would get 50% and so on.
>
>Something to remember here - If a queue is not currently being utilized
>the bandwidth is not available for other traffic. So be very careful
>when deciding how many queues to configure. Traffic may be dropped on
>highly utilized queues while other queues are empty. You could easily
>turn a 100Mhz port into a 50Mhz or even 25Mhz port.
>
>HTH
>
>Ken
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Sila
>Moni
>Sent: Friday, July 01, 2005 12:14 PM
>To: ccielab@groupstudy.com
>Subject: 3550 QoS
>
>I'm reading the URL below, but still not clear on how
>certain thing works.
>http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12225seb/scg/
>swqo
s
>.pdf
>
>Page 68-69 "Allocating Bandwidth among Egress Queues"
>
>If you used 'wrr-queue bandwidth 1 2 3 4', it's 25%
>for each queue. How do you assign a different
>percentage to each of the queue.
>
>Thank you in advance.
>
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