SAP drops on Cisco 3750X stack

[smith606306]

Hi,

I have a 3750X stack with a dula  layer 3 link back to the core. There are 4 switches in the stack running Version 15.0(2)SE2

PCs using SAP frequently drop the connection  to the server in the USA. This only happens on this switch stack, i have patched in another switch with a layer 2 link back to the core and the same users have no SAP drops on this. I have upgraded the IOS, replaced the stacking cables, replaced the fibre modules, took wireshark captures and sent them to Cisco TAC.

Can anyone suggest another way to troubleshoot this?

Thanks        

[Joseph W. Doherty]

Disclaimer

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.

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Posting

Upgrading your IOS to 15.0(2)SE2 might not have been the best choice.  If 15x features not needed, general consensus is 12.2(55)SE8 is the most stable.

That aside, is the SAP traffic you're dealing with an older version of SAP, if so, it's very fragile on the network, for example, it doesn't like any drops (it's not too keen on latency either).  Are any of your 3750X ports showing drops?  If so, is QoS enabled?  If so, you might consider disabling QoS or tuning buffer settings.

[smith606306]

It is the newer version of SAP, there is no QoS on the switch. The 3750X port culprits dont show any drops. Response times from user to server are around 130ms. This only happens from this switch stack not from any other switches on the site.

This is the only switch stack at the site.

[Leo Laohoo]

I'll second Joseph.  Except for 15.0(2)SE4, the entire 15.0(2)SE train is soooo buggy, it's place should be in the sand dunes!

If you don't need features in 15.X, then downgrade to 12.2(55)SE8, however, if you need features in 15.X then try 15.0(2)SE4.

[smith606306]

unfortunately 15.x is the version used as a global company standard as advised by Cisco

[Joseph W. Doherty]

Disclaimer

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

Well then if Cisco recommends the IOS version you're using, work with them on this issue.  Do you have a TAC contract?

[Leo Laohoo]

unfortunately 15.x is the version used as a global company standard as advised by Cisco

Easy enough.  Use 15.0(2)SE4.