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qos Between Switches connected over trunk(Band 16Mbps)

Unanswered Question
Jul 29th, 2012
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Hi Experts


Pls find attached diagram


have vlan streching betwwen sw1 (site1) and sw2 (site2) away from each other 5km, telco authority gives me 16 Mbps between these 2 sites,srv1 has private L2 vlan for database syncronaziation with srv2 at site 2 along with  a public ip ,when the thes 2 servers replicate the database(mssql) with each other over the trunk(16mbps) the trunk link becomes congested then  end up having latency with main service of the servers , now how to configure L2 QOS betwwen these 2 switches(3750) and only reserver bandwith for the sql database 10Mbps while the remaing 6Mbps keep it for the services offered by these servers when the congestion happend....pls advise


thanks in the advance


thanks


jamil

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Joseph W. Doherty Tue, 08/07/2012 - 10:58
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Posting


There are several ways to accomplish this on a 3750.  Best approach depends on how you really want to manage your bandwidth.


You need to get SQL replication into a dedicated egress queue, and all other traffic into its own queue.


Do you always want to cap the SQL replication at 10 Mbps?  (Vs. allowing it to use otherwise unused bandwidth.


Do you always want to cap the non-SQL data at 6 Mbps?


If both SQL replication and non-SQL want more bandwidth, you want to maintain the 5:3 bandwidth sharing ratio?


PS:

What I would suggest, "shape" egress bandwidth at 16 Mbps, and set a bandwidth sharing ratio of 1:255.  Effectively, this would only provide the SQL replication available bandwidth, although it won't be starved.


This should be find unless you find SQL replication can't get enough bandwidth to meet its service requirements, if not, then modify the ratio so it does.

Ibrahim Jamil Wed, 08/08/2012 - 11:46
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Hi Joseph


Thanks for ur reply


Pls sample configuration for the below as Yessssssssss


Do you always want to cap the SQL replication at 10 Mbps?  (Vs. allowing it to use otherwise unused bandwidth.


Do you always want to cap the non-SQL data at 6 Mbps?




jamil

Joseph W. Doherty Wed, 08/08/2012 - 12:14
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The   Author of this posting offers the information contained within this   posting without consideration and with the reader's understanding that   there's no implied or expressed suitability or fitness for any purpose.   Information provided is for informational purposes only and should not   be construed as rendering professional advice of any kind. Usage of  this  posting's information is solely at reader's own risk.


Liability Disclaimer


In   no event shall Author be liable for any damages whatsoever (including,   without limitation, damages for loss of use, data or profit) arising  out  of the use or inability to use the posting's information even if  Author  has been advised of the possibility of such damage.


Posting


interface x

!assuing interface is running at 100 Mbps

!and non-SQL traffic is directed to Q1

!and SQL traffic is directed to Q2

srr-queue bandwidth shape 17 10 0 0
Joseph W. Doherty Wed, 08/08/2012 - 17:18
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The    Author of this posting offers the information contained within this    posting without consideration and with the reader's understanding that    there's no implied or expressed suitability or fitness for any  purpose.   Information provided is for informational purposes only and  should not   be construed as rendering professional advice of any kind.  Usage of  this  posting's information is solely at reader's own risk.


Liability Disclaimer


In    no event shall Author be liable for any damages whatsoever  (including,   without limitation, damages for loss of use, data or  profit) arising  out  of the use or inability to use the posting's  information even if  Author  has been advised of the possibility of such  damage.


Posting


Ibrahim Jamil wrote:


H Joseph


what are the below value in the shape?


17 10 0 0

On a 100 Mbps port, 1/17 (5.88 Mbps) and 1/10 (10 Mbps).

robert.horrigan Thu, 08/09/2012 - 11:54
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Just a side note - I always run L3 over MetroE circuits and would recommend that to anyone....

Ibrahim Jamil Thu, 08/09/2012 - 12:41
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Hi Robert


the business require L2 Extension so we hqad to go with L2 to acomplish the VLAN Steching


jamil

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