GTM Question

GTM is F5's GSLB (Global Server Load Balancing) solution, this enables site redundancy using DNS. In a simplified environment with 2 sites you would require a single GTM device on each site, you could not perform this with a single box on one site as this would not achieve the site redundancy aim if the site with the GTM was to fail.

 

 

The GTM's on each site poll the other GTM (using iQuery: 4353) and also the other LTM's (or other load balancers), and servers on both sites, if there are communication issues then the GTM will mark the service as down and will not direct DNS queries to that service.

 

 

Link Controller (LC) is a cut down version of GTM that does not allow the inbound GTM functions but allows for (outbound) link load balancing, this is also included in the full GTM product.

 

 

 

 

Craig