From: David Bombal (davidbombal@davidbombal.com)
Date: Wed Jun 07 2006 - 14:38:23 ART
Hi JNB,
The 3750 has Queue 1 as an optional priority queue. You enable the priority
queue via the priority-queue out interface command. The three remaining
egress queues on the 3750 are scheduled by a Shaped Round-Robin (SRR)
algorithm, which can be configured to operate in shaped mode or in shared
mode. In shaped mode, assigned bandwidth is limited to the defined amount;
in shared mode, any unused bandwidth is shared among other classes (as
needed).
Shaped or Shared bandwidth weights can be assigned to a queue via the
srr-queue bandwidth shape and srr-queue bandwidth share interface commands.
Shaped mode weights override shared mode weights and use an inverse ratio
(1/weight) to determine the shaping bandwidth for the queue. Furthermore, if
shaped weights are set to 0, then the queue is operating in shared mode. For
example, the following interface command srr-queue bandwidth shape 3 0 0 0
would shape Q1 to 1/3 of the available bandwidth and set all other queues to
operate in sharing mode.
Here is an example:
CAT3750(config)#interface range GigabitEthernet0/1 - 28
CAT3750(config-if-range)# queue-set 1
! Assigns interface to Queue-Set 1 (default)
CAT3750(config-if-range)# srr-queue bandwidth share 1 70 25 5
! Q2 gets 70% of remaining BW; Q3 gets 25% and Q4 gets 5%
CAT3750(config-if-range)# srr-queue bandwidth shape 3 0 0 0
! Q1 is limited to 1/3 of the total available BW
CAT3750(config-if-range)# priority-queue out
! Q1 is enabled as a PQ
Hope this helps.
David Bombal
CCIE, CCSI, CCIP, CCSP, CCDP
http://www.ConfigureTerminal.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of j
buss
Sent: 07 June 2006 12:07
To: ccileigh@gmail.com
Cc: ccielab@groupstudy.com
Subject: [Bulk] Re: Shaped round robin QOS on 3750 instead of WRR
Hi,
Thanks for your reply, But I am looking for an explanation on how to do
exact the following:
>>queue1 cos value 0 1
>>queue2 cos value 2 3
>>queue3 cos value 4
>>queue4 cos value 5 --> priority
>>
>>Where queue 4 gets 50% of the bandwidth (if congestion is occuring).
>>and is priority queue
>>
>>queue 1 gets 50% of remaining bandwidth queue 2 gets 20% of remaining
>>bandwidth queue 3 gets 30% of remaining bandwidth
>>
>>I cant find any good example on how to do this.
Regards,
JNB
>From: Leigh Harrison <ccileigh@gmail.com>
>Reply-To: Leigh Harrison <ccileigh@gmail.com>
>To: ccie_sp@hotmail.com
>CC: ccielab@groupstudy.com
>Subject: Re: Shaped round robin QOS on 3750 instead of WRR
>Date: Wed, 07 Jun 2006 11:34:41 +0100
>
>Hey there,
>
>For the best example of configuring qos on a 3750 - run auto qos. Then
>you can hack out the bits you want and tweak to your hearts content.
>
>under an interface (eg f1/0/1) type: "auto qos voip [cisco-phone]"
>
>http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12225see/cr
>/cli1.htm#wp2737523
>
>Enjoy
>LH
>
>ccie_sp@hotmail.com wrote:
>>Hi guys,
>>
>>I've setup WRR on a cisco 3550, with one priority queue.
>>On a 3750 WRR is not possible as far I know.
>>
>>Is SRR the new way of doing it?
>>
>>I want to have 4 queue's and setup the bandwidth per queue, but there
>>MUST be one queue which is alway serviced before the others (for voice
>>traffic) if the link is congested.
>>
>>so I want:
>>
>>queue1 cos value 0 1
>>queue2 cos value 2 3
>>queue3 cos value 4
>>queue4 cos value 5 --> priority
>>
>>Where queue 4 gets 50% of the bandwidth (if congestion is occuring).
>>and is priority queue
>>
>>queue 1 gets 50% of remaining bandwidth queue 2 gets 20% of remaining
>>bandwidth queue 3 gets 30% of remaining bandwidth
>>
>>I cant find any good example on how to do this.
>>
>>Thanks for the help
>>
>>______________________________________________________________________
>>_ Subscription information may be found at:
>>http://www.groupstudy.com/list/CCIELab.html
>
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