ACE / CSM: how does predictor staticload work?

Unanswered Question
Mar 25th, 2008

Hello,

I tested to implement the new ACE feature "staticload" .

It seems to be that the connections are not distributed according to my settings.

Does anyone have an idea how this feature works?

Our SW versions are:

===================

core1#show module 9

Mod Ports Card Type Model Serial No.

--- ----- -------------------------------------- ------------------ -----------

9 4 SLB Application Processor Complex WS-X6066-SLB-APC SAD101803W7

Mod MAC addresses Hw Fw Sw Status

--- ---------------------------------- ------ ------------ ------------ -------

9 0017.0ee1.bddc to 0017.0ee1.bde3 1.9 4.3(1) Ok

Mod Online Diag Status

---- -------------------

9 Pass

===================

===================

core1#sh ver

Cisco Internetwork Operating System Software

IOS (tm) s72033_rp Software (s72033_rp-ADVIPSERVICESK9_WAN-M), Version 12.2(18)SXF12, RELEASE SOFTWARE (fc2)

===================

If you need further information feel free to contact me.

Best Regards,

Thorsten

I have this problem too.
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Gilles Dufour Tue, 03/25/2008 - 07:35

the feature is there to match the behavior of the CSS and the way it calculates an average load to be sent vi GSLB to a GSS.

The feature expect you to write a script that will update the load on the CSM on the fly.

The CSM basically just sends traffic to the least loaded server.

Gilles.

thorsten.steffen Tue, 03/25/2008 - 08:22

Hello Gilles,

thanks for your quick answer but I do not really understand your answer.

Do I understand the staticload feature correctly, that you now can configure a ratio how the real servers are getting new connections?

Is there any documentation expect that in the Release Notes about this new feature? If yes could you please and send me the link.

Best Regards,

Thorsten

Gilles Dufour Tue, 03/25/2008 - 10:00

Thorsten,

sorry to say this, but if you do not understand the description, this probably means you don't need this feature.

It was developped for one customer with a very specific requirement.

the Load MUST be updated on the CSM by a script running on the server.

The CSM will send ALL traffic to the server with the lowest load.

If you do not update the load via a script, you end up with all traffic going to one server.

Very few people have scripts running on the server updating the csm config.

If you want to have some servers handling more traffic than others, you need to configure weight.

This is describe here :

http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/csm/4.1.x/4.1.1/command/reference/m_r.html#wp1057123

This works with predictor roundrobin or leastconn.

Gilles.

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