iQuery between LTM

Hi all,

 

 

I am working on for a solution for the scenario below.

 

 

2 active-active Data centres to provide HTTPs service.

 

 

1 GTM cluster on each DC

 

1 LTM active-standby cluster in each DC for reverse-proxy servers

 

1 LTM active-standby cluster in each DC for real servers.

 

 

 

 

Traffic flow will be:

 

 

client->reverse-proxy servers LTM->reverse-proxy servers-> real servers LTM -> real servers

 

 

GTM will pick up which DC to use. The client traffic will initiate a session to reverse-proxy server LTM in the DC which GTM specified. Then Reverser-porxy LTM will LB traffic to one of reverse-porxy servers. The selected reverse proxy server will create a new session for SSL traffic to the second LTM for real servers. The second LTM will forward the traffic to the real server.

 

 

My question is about the load management:

 

 

When all real servers in one DC are overloaded, e.g.DC 1, how GTM know this so that GTM can identify this DC1 is "unavailable"?

 

 

Could you please advise how i can achieve my objective?