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Patrik_Jonsson's avatar
Patrik_Jonsson
Icon for MVP rankMVP
Mar 12, 2014

Hi Teepan!

 

Definately not recommended and while failover might work the sync will probably not work.

 

Check this article out (it's about upgrading redundant pairs from 9 to 10 during which you would have a scenario such as the one you described):

 

http://support.f5.com/kb/en-us/solutions/public/11000/200/sol11215.html

 

Copied from the SOL:

 

Important: F5 does not support high availability pair configurations in which each system is running a different software version, because this configuration may affect certain functionalities, such as network failover traffic. However, when you follow the standard upgrade procedure, and you upgrade one unit in the high availability pair while the peer system temporarily runs the older version, systems running different but very close maintenance releases are likely to use the same network failover protocol and payload. Systems running different major or minor releases may use a different network failover protocol or payload, causing network failover to cease functioning. F5 recommends that you upgrade BIG-IP high availability pairs that are configured with network failover by performing one of the following Upgrading an active/standby BIG-IP high availability pair configured with network failover procedures. For more information about the F5 software versioning schema, refer to SOL8986: F5 software life cycle policy.

 

Hope that answered your question.

 

/Patrik