GTM integration in existing F5 LTM setup

Hi,

 

1- I have two Datacenter A and B. 2- Each DC having an F5 LTM in Act/Sby and they are configured and running. 3- Now I want to integrate GTM into my existing infrastructure. 4- The GTM I have is already configured and load balancing other LTM in some other DC E and F. 5- The LTM that i have in DC A and B are running same applications having different VIPs. 6- I currently have two GTMs in DC A and B

 

Can anyone please help, how can I integrate the GTM already configured (without interrupting the application already running on it) into my existing LTM infrastructure.

 

Will there be down time when i discover existing LTM in GTMs. ? What configuration i have to do on a DNS server and on the GTMs?

 

I am new to GTM configurations please help me with the detailed steps.

 

Thanks