More on GTM + LTM design across 2 DC

To get the nodes to communicate you'll have to ensure the following:

 

"These IP addresses on the target GTM and LTMs must have port 22 and 4353 allowed on the self-ips that will communicate."

 

So.. your GTMs will need to be able to communicate to a self-IP on each of the LTMs that have "custom" ports allowed of port 22 and 4353.

 

Your GTMs will also need to be able to communicate to self-IPs on each other ( the pairs will be doing this via the crossover cable ) using these same ports.

 

To set these up you'll need to go to the "Network" section.. then "Self-IPs". Then select the Self-IP that will be used for communication. The communication is secure using ssh, but I highly recommend that all of the communication occur on an internal subnet. For IPV4 use an RFC1918 subnet. For IPV6... you'll have to find someone that knows more about IPV6 than me to get a recommendation.

 

 

iQuery is the API that the bigips use to communicate with each other.

 

 

Hope this helps.