Migration challange from 3 bigip.conf file to 1 bigip.conf

Hi, We are planning to migrate 3 of our old BIGIP-LTM box to a new box. We have three different software version on the old boxes which are 10.2.3, 10.2.4 and 9.4.5 we are planning migrate all of them to a brand new box of software 11.5.3

 

We are not able to consolidate three different version bigip.conf into one.

 

Please advice the best way achive minimal error and downtime to migrate. Thanks in advance!

 

Old F5 devices are on below versions -

 

F5 Device 1- BIG-IP 10.2.3 Build 123.0 Hotfix HF1 F5 Device 2- BIG-IP 10.2.4 Build 864.0 Hotfix HF11 F5 Device 3- BIG-IP 9.4.5 Build 1049.10 Final New data centers are on updated OS Version - BIG-IP 11.5.3 No. of iRule - 25 Nos. No. Profile - 50 Nos. approx No. of VIPs - 230 Nos.

WR, Nantu