From: Reza Toghraee (reza@toghraee.com)
Date: Tue Oct 28 2008 - 12:39:08 ARST
Roger,
Let me explain how 3560 handles these Queues.
When you enter " srr-queue bandwidth" on an interface, IOS allows you to
enter 4 numbers (in 1-255 range) as the weight of each queue.
For example you enter "srr-queue bandwidth 1 10 79 30"
The IOS sum these values (1+10+79+30) which is 120.
Next IOS checks how much is the available BW of the interface. Also it
checks if the interface has a " srr-queue bandwidth limit" which decreases
the BW of the interface.
Next IOS calculates the bandwidth for each queue based on the weights and
interface bandwidth. This bandwidth will be the guaranteed bandwidth and
will not effect unless interface is congested.
Reza
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Roger RPF
Sent: Tuesday, October 28, 2008 4:16 PM
To: 'GS CCIE-Lab'
Subject: question regarding queueing on Catalyst
Hi Group,
I have a question regarding queueing on the switches, for example on a 3560.
If I have a FastEthernet port and I enable srr-queueing as below:
mls qos
Int Fa0/15
srr-queue bandwidth share 40 10 20 30
The configured values, reflect the percentage which the queue in case of
congestion is allocated. Which bandwidth value does the switch take to
calculate the real values? The Interface bandwidth, in our case 100Mb? If
I configure for example bandwidth 10, are the calculations based on 10Mb? So
the switch will start already start queueing (think that he is concested)
when traffic reaches 10Mb?
many thanks in advance
Roger
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