F5 GTM Appliance
I am new to F5 and willing to understand the F5 GTM design.We have 2 Data centers connected over fiber. We need to operate them in Active/Active. What i understand from the F5 website is that u place a GTM appliance in each of the data center. The appliance has a virtual IP with the pool of real IPs that it distributes traffic to based on selected algorithm.
Now how it works? My user on the internet tries to access www.xyz.com, the DNS server of my ISP directs it to the GTM ( which GTM - Datacenter1 or 2?) and the GTM appliance forwards the traffic to best server.
is my understanding correct?
Now my questions
how does the 2 GTM appliances communicate for a failure?
How does the ISP direct traffic to the GTM? via DNS? How does is select it should go to primary site or secondary?
What happens when DC 1 fails - there is a disaster - how does the ISP send the request to DC2?
What if i have links from 2 different ISPs and i have my own AS? is the GTM IP need to be registered to both ISP DNSs?
I think i am pretty confused in the DNS functionality.
I would highly appreciate if you help me understand.