ACE - Cooke Insert

Answered Question
Aug 3rd, 2009

Hello,

I would like to know that with Cookie based session persistence, does the cookie hash value remain the same throughout the lifetime of server farm. Because, I believe the hash value is calculated out of serverfarm + rserver + port which is not expected to change.

Please suggest whether the cookie value ever changes for a specific serverfarm.

Regards.

I have this problem too.
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Correct Answer by Syed Iftekhar Ahmed about 7 years 4 months ago

Cookie value will be unique for each rserver in Serverfarm.

The ACE creates a unique static entry (based off of a hash of the port, rserver name, and serverfarm name)in sticky database for every rserver in the serverfarm. This value will never change for a "specific real server" in a server farm.

Another recent change in the ACE code let you define a string for each rserver (instead of using hash value). For more info read my post at

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&CommCmd=MB?cmd=pass_through&location=outline@^1@.2cd30281/3#selected_message

Thanks

Syed

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Correct Answer
Syed Iftekhar Ahmed Mon, 08/03/2009 - 17:13

Cookie value will be unique for each rserver in Serverfarm.

The ACE creates a unique static entry (based off of a hash of the port, rserver name, and serverfarm name)in sticky database for every rserver in the serverfarm. This value will never change for a "specific real server" in a server farm.

Another recent change in the ACE code let you define a string for each rserver (instead of using hash value). For more info read my post at

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&CommCmd=MB?cmd=pass_through&location=outline@^1@.2cd30281/3#selected_message

Thanks

Syed

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